918D Manual RevD - Newport Corporation
Contents
1. eee 2 1 2 Photodetector Features ssseseeeee 2 1 3 Photodetector Specifications esse d 1 4 Making Measurements erecto rere tenete tosa 6 1 5 Optional Aecessorles negro erne 9 1 6 SANIT m e a E EEE 10 1 6 Temperature and Humidity ees 11 Section 2 Calibration Accuracy and Limitations 2 1 Spectral RESPONSE sss eer etn e POR ER ee P Rea 12 2 2 Calibration Accuracy and Service ssessssss 12 2 3 Unpitormity D ete EOD 13 2 4 Saturation 5 5 n crie a Cu GU UR ORO HIER NS 13 2 5 Saturation with Pulsed Power Measurements 14 2 6 ode M 14 27 Photodiode Operation e tero or rer ieenn 15 2 8 Low Power Measurement Considerations 16 2 8 1 Noise Characteristics seruristo 16 2 8 2 Ambient Light and Electrical Offsets ss 17 2 9 Using the Detector for Non CW Measurements 18 Section 3 Service Form List of Figures Figure 1 Attenuator ON OFF dial sserrep nanen 8 Figure 2 Model 918D B se Kit eee eterne 9 Figure 3 Cleaning Detector Optics tette 10 Figure 4 Transimpedance Amplifier sisisi 15 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 2 General Information This guide contains information necessary for using model 918D series photodetectors Please read through the guide before attempting2. 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 1 Model 918D Series Photodiode Detectors User s Manual Ad Newport Experience Solutions amp 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 2 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page i Model 918D Series Photodiode Detectors Dear Customer This User Manual contains essential information including safety precautions and start up procedures needed to get your new instrument up and running Please review it prior to unpacking and powering up the instrument In an effort to keep the Newport instruments optimized for your applications Newport will on occasion update existing and add new features and documents You can find the latest User Manual application software Start up Guide or firmware at the product page on the Newport website www newport com Call your local Newport application specialist if you need support with locating or downloading these files Enjoy your new product 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page ii Warranty Newport Corporation warrants that this product will be free from defects in material and workmanship and will comply with Newport s published specifications at the time of sale for a period of one year from date of shipment If found to be defective during the warranty period the product will either be repaired or repl
3. B AxT If the transmission T of the filter is not known it can be determined by following the steps below 1 Reduce the optical power to a level low enough to avoid saturation but high enough that when it is reduced by the filter it can still be accurately measured 2 Follow steps 1 and 2 in the procedure above 3 Calculate the ratio T B A to determine the transmission of the filter at the wavelength of light used for the measurement The calibrated filter or attenuator can be used with the detector to measure the power of higher power beams 2 5 Saturation with Pulsed Power Measurements Saturation effects are a complex phenomenon when using pulsed lasers and depend upon the wavelength peak power pulse shape average power repetition rate and on the type of detection circuit However the test for saturation described immediately above should be used whenever pulsed power measurements are being made E Reflections The photodetector surface window material and the attenuator all reflect light The amount of reflected light depends upon the angle of incidence and the polarization of the beam Reflected light does not get absorbed by the detector and therefore is not included in the detector signal The Newport detector and attenuator calibration include the loss due to reflection for incoherent light incident normal to the detector For accurate power measurements the detector should therefore be used at near norma
4. incident on the photodiode For high optical powers saturation of the detector begins to occur and the response signal is no longer linearly proportional to the incident power Optical power mea surements must be made in the linear region to be valid Newport s optical meters measure the current coming from the detector and will let you know before the detector is near its saturation point However it is possible to locally saturate the detector by subjecting it to high power densities power per unit area This is why it is important to fill the central portion of the detector s active area as much as possible NOTE The saturation is soft i e the detector output does not suddenly stop increasing but the rate of increase slows For Gaussian and other signals with spatially varying intensities local saturation may occur The onset of saturation is not always obvious and is a common source of inaccurate measurements 13 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 14 To determine if the detector is saturating follow the steps below 1 Measure the photodetector current or power and record this value A 2 Place a filter or attenuator of known transmission T in the beam path Record the current again B A filter transmission of 0 001 is a convenient choice 3 The power with the filter in place should be the product of the power measured without the filter and the transmission of the filter ie
5. optical axes of the internal photodiode directly over the mounting hole located on the bottom surface of the detector This should provide a more accurate alignment of the laser beam onto to the photodi ode in the event the detector is rotated around its axis The loca tion of the optical axis is maintained for all detector types 8 32 and M4 threaded holes are provided on the detector housing perimeter for post mounting to an optical table e 918D series detectors can be post mounted or mounted to an optional base plate allowing the positioning of the detector on a flat surface or bolting it to an optical table e The 918D IG C1 cooled InGaAs detector includes a thermistor which measures the temperature of the photodiode and provides feedback to the TEC controller card inside the 1935T C 2935T C and 2935T C 1 optical meters 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 8 Figure 1 Model 918D attenuator ON OFF dial NOTE You must manually set the optical meter to the correct wavelength for the light source you are measuring to obtain accurate power measurements 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 9 1 5 Optional Accessories Base Plate A base plate kit Model 918D Base Kit consisting of the plate and mounting screws is available for using the detector on a flat surface or optical table A total of 5 screws are provided 1 set screw to attach the base pl
6. Cylinder Attenuator Built In OD3 4 Built In OD1 OD2 or opa Calibration Stored Internally 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 5 918D IR 918D IG 918D IG C1 Obsolete 0 78 1 8 0 8 1 65 1 2 2 55 2 2 2 3 3 3 0 35 0 35 0 35 0 35 0 35 0 35 296 780 910nm 296 911 1700nm 4 1701 1800nm 2 800 900nm 2 901 1650nm 5 1200 1390nm 4 1400 2520nm 8 2530 2540nm 5 780 910nm 2 911 1700nm 4 1701 1800nm 5 800 900nm 2 901 1650nm 5 1200 1390nm 4 1400 2520nm 8 2530 2540nm 2 2 2 0 5 0 5 0 5 lt 2 lt 2 lt 100 ns 35 kQ 220 760 kQ 0 25 2 2 0 6 x 10712 4 0 x 10714 5 x 10713 Germanium Indium Gallium Arsenide Indium Gallium Arsenide w built in 2 stage T E cooler 0 071 0 071 0 0079 0 3 0 3 0 1 Cylinder Cylinder Cylinder Built In OD1 OD2 or Oop3 4 Built In OD1 OD2 or Built In OD1 OD2 or op3 4 opa Stored Internally 1 Applies to entire spectral response 2 15 ns pulse width 3 Uniformity specification applies to detector only 4 Selected at time of ordering 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 6 EI Making Measurements 918D series photodetectors are terminated with a 15 pin D Sub con nector which needs to be attached to the back or side panels of Newport s optical meters In order to assure good electrical co
7. aced at Newport s option To exercise this warranty write or call your local Newport office or representative or contact Newport headquarters in Irvine California You will be given prompt assistance and return instructions Send the product freight prepaid to the indicated service facility Repairs will be made and the instrument returned freight prepaid Repaired products are warranted for the remainder of the original warranty period or 90 days whichever first occurs Limitation of Warranty The above warranties do not apply to products which have been repaired or modified without Newport s written approval or products subjected to unusual physical thermal or electrical stress improper installation misuse abuse accident or negli gence in use storage transportation or handling This warranty also does not apply to fuses batteries or damage from battery leakage THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE NEWPORT CORPORATION SHALL NOT BE LIABLE FOR ANY INDIRECT SPECIAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE PURCHASE OR USE OF ITS PRODUCTS First printing 2006 2005 by Newport Corporation Irvine CA All rights reserved No part of this manual may be reproduced or copied without the prior written approval of Newport Corporation This manual has been provided for information only and product specificatio
8. ate to the detector and 4 screws for attaching the plate to an optical table 2 Metric and 2 English Figure 2 Model 918D mounted on Base 44640 02RevD 5 5x7 5_44640 01 RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 10 1 6 Cleaning The 918D series detector head must not be disassembled for cleaning purposes The attenuator optics can be cleaned by placing the inter nal filter in the ON position and accessing it from the front Clean attenuator surface when in On position Clean Photodiode surface when in Off position Figure 3 Cleaning Detector Optics on Model 918D The front surface of the glass window or attenuator window can be accessed through the opening in the detector The photodiode surface does not need to be cleaned as it is posi tioned in a sealed environment behind the window Use the proper optics grade lint free cotton swabs and organic solvent such as opti cal grade isopropyl alcohol reagent grade acetone or lens cleaning solution NOTE Kleenex and Kim wipes contain wood and fiber glass respectively and will scratch optical surfaces CAUTION Fragile parts contained Use caution when handling 10 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 11 Care should be taken not to touch the photodiode window or attenuator with bare fingers Contaminants may cause inaccurate measurements particularly at ultraviolet wavelengths where absorption is co
9. he photodiode housing provides the actual temperature reading back to the controller card which will maintain the temperature at the optimal level The instrument front panel display will indicate when the optimal tempera ture level is attained at which point the detector is ready for taking measurements The detector temperature will typically settle within a few seconds after the detector is plugged into the instrument 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 7 e 918D series detectors are available with one of several built in optical attenuators OD1 OD2 or OD3 which are mounted on a slide internal to the detector housing The On Off position of the attenuator is automatically detected by the optical meter e 918D series detectors have a built in EEPROM which stores the responsivity data for the detector The 918D responsivity data is stored for both with and without the attenuator filter in the beam path The detectors are hot pluggable enabling this data to be uploaded onto the power meter when the detector is first con nected to the instrument allowing for corrections of the respon sivity as a function of the wavelength selected by the user 918D series detectors include a thermistor which measures the temperature of the detector and allows the optical meter to make numerical corrections of the responsivity as a function of temper ature 918D series detectors were designed to position the
10. ith voltage offsets in the amplifier circuitry The offset can be removed by use of the optical meter s zero function Please note however that the offset is a func tion of the temperature of both the photodiode and the amplifier inside the optical meter When measuring very low light levels it is best to re zero the meter whenever you think that the temperature of the detector or the optical meter may have changed For instance it is good practice to re zero the meter after a warm up period of about 30 minutes Refer to your optical meter manual for details regarding the zeroing procedure All 918D series photodetectors have a threaded aperture for the attach E ment of accessories When measurements of power in fiber optics are being made the effects of ambient lighting can be minimized by using the Model 818 FA Fiber Adapter Holder with the appropriate FP3 or FP4 series fiber adapters If free space beam measurements are desired using an attenuator will reduce stray light and often improve the ratio of signal to background noise Wavelength specific filters such as optical cutoff bandpass or spike filters can also be used if the signal wavelength spectrum permits Other techniques to reduce stray light include using apertures to admit only the laser beam placing the detector in a box to shield the surface and turning off external lighting 17 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 18 FX Using
11. l incidence 14 amp 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 15 2 7 Photodiode Operation When a photon is absorbed in the photodiode an electron hole pair is formed within the device and a voltage is developed across the diode junction If the photodiode terminals are R FEEDBACK Op Amp Circuit I Photovoltaic Mode ES V LIGHT OUT 15 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 16 2 8 Low Power Measurement Considerations Measurements of very low power optical sources are possible with 918D series photodetectors To use the detector properly and achieve accurate results requires the understanding of a number of effects that limit the device performance which are discussed below 2 8 4 Noise Characteristics The lower limits of optical detection are determined by the noise char acteristics of the detector and or amplifier Theory predicts that the photodiode noise is largely thermal Johnson noise associated with the effective resistance of the photodiode and shot noise from dark current Additionally there is Johnson noise contributed by the resis tance of the amplifier s feedback resistor The dark current at a 10mV bias voltage is measured and used to define the effective resistance of the photodiode known as the shunt resistance Rshunt Vbias Idark where Vbias 10mV Ideally an input amplifier connected as in Figure 4 would have no
12. mmon Potentially large measurement errors can be induced by scratches digs and damage to the optical surfaces of the attenuator or detector For dust removal use pressurized gas filtered dry nitrogen and lint free cotton swabs dabbed in an organic solvent Temperature and Humidity The temperature range of 5 to 50 C should not be exceeded and the detector should not be exposed to humidity levels greater than 70 The photodiode sensitivity increases with temperature mainly for wavelengths longer than the peak response wavelength The temperature of the 918D series detectors is monitored with a ther mistor and the responsivity is numerically compensated to keep the calibration accurate within specification throughout the operating temperature for certain wavelengths 11 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 12 2 Calibration Accuracy and Limitations EI Spectral Response The response of the detector depends on the wavelength of the inci dent light The photodiode is transparent for photon energies less than the band gap which determines the long wavelength infrared sensitivity limit The short wavelength limit is determined by the photodiode manufacturing process and possibly in the case of silicon photodiodes by strong window absorption The photodiode response is commonly measured in amps of photocurrent per watt of incident optical power The response curves for the photodetector are shown o
13. n the calibration report Rel Calibration Accuracy and Service Statement of Calibration The accuracy and calibration of this photodetector are traceable to National Institute of Standards and Technology NIST and or National Research Council of Canada NRC through equipment which is calibrated at planned intervals by comparison to certified stan dards maintained at Newport Corporation Newport Corporation calibrates its detectors using secondary standards directly traceable to NIST and or NRC The absolute accuracy of the photodetector calibration is indicated on the calibra tion report Detector response can change with time at different wave lengths especially in the ultraviolet and should be returned for recali bration at one year intervals to ensure confidence in the accuracy of the measurement For recalibration services contact Newport Corporation at 800 222 6440 12 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 13 2 3 Uniformity Fabrication processes may cause the response of the detector to vary slightly over the detector surface Calibration involves illumination of approximately 70 of the detector s central active diameter Optical signals being measured should illuminate approximately this same area Care should be taken not to overfill the detector if accuracy is to be maintained m Saturation For low optical power the photocurrent is linearly proportional to the optical signal
14. ndheld Optical Power Energy Meter 842 PE Handheld Optical Power Energy Meter 1916 C Handheld Optical Power Meter The 918D IG C1 cooled InGaAs detector can only be used with the 1935T C 2935T C and 2935T C 1 optical meters which include a Thermo Electric Cooler TEC Controller card The detector has an additional cable terminated with a 9 pin D Sub type connector for driving the TEC inside the detector head E Photodetector Specifications 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 4 Model 918D UV 918D SL Spectral Range um 0 2 1 1 0 4 1 1 Power Average Max w Attenuator 0 2 2 W cm2 1 Power Average Maximum w o Attenuator 0 2 2 mW cm2 1 Pulse Energy Maximum w Attenuator 0 1 1 uJ cm2 2 Pulse Energy Maximum w o Attenuator 0 1 1 nJ cm2 2 Calibration Uncertainty Without Attenuator 496 200 219nm 2 220 349nm 1 350 949nm 4 950 1100nm 1 400 940nm 4 941 1100nm Calibration Uncertainty With Attenuator 8 200 219nm 2 220 349nm 1 350 949nm 4 950 1100nm 1 400 940nm 4 941 1100nm Uniformity 3 2 2 Linearity 0 5 0 5 Rise Time us lt 5 9 lt 2 Shunt Resistance MQ typ gt 10 210 Reverse Bias Maximum V 5 3 NEP W Hz 4 5 x 10713 2 0 x 10713 Material Silicon Uv Enhanced Silicon Active Area cm2 1 1 Active Diameter cm 1 13 1 13 Shape Cylinder
15. nnectiv ity it is recommended that the thumbscrews located on both sides of the connector be hand tightened Each detector comes with its unique calibrated responsivity data encoded in an EEPROM built into the detector body Calibration data is provided for the detector with and without the optical attenuator Newport s 1936 2936 series of optical meters read the EEPROM data not only during initial power up but at any time a detector is con nected to and subsequently sensed by the optical meter The 918D series photodetectors have a built in optical attenuator which can be manually switched into or out of the optical path using a thumb wheel located on top of the detector housing Attenuator ON and OFF markings indicate the turning direction A built in sensor automatically detects the attenuator position signaling the instrument to use the appropriate responsivity for the detector attenu ator combination The 918D IG C1 cooled InGaAs detector is terminated with two cables The first one is identical to the cable on the standard 918D series detectors and is terminated with a 15 pin D Sub connector The second cable is terminated with a 9 pin D Sub connector and needs to be attached to the TEC Controller card of the 1935T C 2935T C or 2935T C 1 optical meters Upon turning on the power meter the TEC inside the detector head will start cooling down the photodiode to the factory preset temperature A temperature sensor inside t
16. ns are subject to change without notice Any change will be reflected in future printings Newport Corporation 1791 Deere Avenue Irvine CA 92606 USA Part No 44640 02 Rev D ii 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page iii Confidentiality amp Proprietary Rights Reservation of Title The Newport programs and all materials furnished or produced in connection with them Related Materials contain trade secrets of Newport and are for use only in the manner expressly permitted Newport claims and reserves all rights and benefits afforded under law in the Programs provided by Newport Corporation Newport shall retain full ownership of Intellectual Property Rights in and to all devel opment process align or assembly technologies developed and other derivative work that may be developed by Newport Customer shall not challenge or cause any third party to challenge the rights of Newport Preservation of Secrecy and Confidentiality and Restrictions to Access Customer shall protect the Newport Programs and Related Materials as trade secrets of Newport and shall devote its best efforts to ensure that all its personnel protect the Newport Programs as trade secrets of Newport Corporation Customer shall not at any time disclose Newport s trade secrets to any other person firm organization or employee that does not need consistent with Customer s right of use hereunder to obtain access to the Newport Pr
17. off set voltage and there would be no dark current In practice though a small bias usually exists For non CW measurements the light detec tion limit is more generally expressed as the intensity of light required to produce a current equal to the noise current i e a signal to noise level of 1 This is called the noise equivalent power NEP and is expressed as NEP Noise Current Sensitivity W VHz with sensitivity defined as the current generated by the photodiode for a given incident power at a specific wavelength NEP varies inversely with the spectral response of the photodiode and depends on the wave length the noise frequency f and bandwidth Cf Noise and dark current generally increase exponentially with detector temperature so it is best to keep the temperature close to 25 C 16 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 17 2 8 2 Ambient Light and Electrical Offsets Good measurement technique dictates that the effects of ambient light should be reduced as much as possible when using photodiodes Although the photocurrent generated by ambient light can be easily zeroed out the shot noise associated with the photocurrent will not be zeroed nor will any changes in the ambient light levels which might be caused by people moving around in the room A small electronic offset will always be present with semiconductor detectors caused by an interaction of the detector shunt resistance w
18. ograms and Related Materials These restrictions shall not apply to information 1 generally known to the public or obtainable from public sources 2 readily apparent from the keyboard operations visual display or output reports of the Programs 3 previously in the possession of Customer or subse quently developed or acquired without reliance on the Newport Programs or 4 approved by Newport for release without restriction Service Information This section contains information regarding factory service for the source The user should not attempt any maintenance or service of the system or optional equipment beyond the procedures outlined in this manual Any problem that cannot be resolved should be referred to Newport Corporation iii 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page iv Technical Support Contacts North America amp Asia Europe Newport Corporation Service Dept Newport MICRO CONTROLE S A 1791 Deere Ave Irvine CA 92606 Zone Industrielle Telephone 949 253 1694 45340 Beaune la Rolande FRANCE Telephone 800 222 6440 x31694 Telephone 33 02 38 40 51 56 Asia 253 Aidu Road Bld 3 Flr 3 Sec C Shanghai 200131 China Telephone 86 21 5046 2300 Fax 86 21 5046 2323 Newport Corporation Calling Procedure If there are any defects in material or workmanship or a failure to meet specifica tions promptly notify Newport s Returns Department by calling 1 800 222 6440 or by visiting
19. our website at www newport com returns within the warranty period to obtain a Return Material Authorization Number RMA Return the product to Newport Corporation freight prepaid clearly marked with the RMA and we will either repair or replace it at our discretion Newport is not responsible for damage occurring in transit and is not obligated to accept products returned with out an RMA E mail rma service newport com When calling Newport Corporation please provide the customer care representative with the following information Your Contact Information Serial number or original order number Description of problem i e hardware or software To help our Technical Support Representatives diagnose your problem please note the following conditions Is the system used for manufacturing or research and development What was the state of the system right before the problem Have you seen this problem before If so how often Can the system continue to operate with this problem Or is the system non operational Can you identify anything that was different before this problem occurred iv 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 1 Table of Contents Wairani Pt ii Technical Support Contacts cierre iecit enti tenere redet kg iv Table of Contents 53 sr cnn eier Enn RE Pee aN 1 List of FU SUPCS Mer T 1 Section 1 General Information 1 1 Unpacking and Inspection
20. rvine CA 92606 In U S 800 222 6440 Tel 949 863 3144 Fax 949 253 1680 Internet sales newport com CN Newport Experience Solutions Visit Newport Online at www newport com Newport Corporation Irvine California has been certified compliant with ISO 9001 by the British Standards Institution amp
21. the Detector for Non CW Measurements When the photodetector is used with a Newport optical meter it is operated essentially without bias voltage as depicted in Figure 4 The effective time constant of the detector amplifier combination may be much slower than the characteristic time of the signal Nonetheless if the detector amplifier combination does not become saturated effective integration of the signal will occur and accurate power measurements of very short pulses can be made Additionally if the repetition rate or duty cycle is sufficiently high good average power measurements can be made Usually it is helpful to turn on the analog filter 5Hz low pass to smooth the DC component so that the optical meter will make consistent measurements of the average power 18 44640 02RevD 5 5x7 5_44640 01 RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 19 EN Service Form CN Newport Corporation USA Office 800 222 6440 Newport FAX 949 253 1479 Experience Solutions Name Return Authorization Please obtain RA prior to return of item Company Address Date Country Phone Number P O Number Fax Number Item s Being Returned Model Serial Description Reason for return of goods please list any specific problems 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 20 Newport Corporation Worldwide Headquarters 1791 Deere Avenue I
22. to make optical power measurements or energy measurements El Unpacking and Inspection The 918D photodetectors are shipped in a foam padded cardboard box The user s manual and the calibration report are also included The cal ibration report is unique to each detector and should be archived for future reference The calibration interval recommended for these detec tors is 12 months Please make sure that these items are received in good condition NOTE The only user serviceable part of this detector is the cleaning of the internal attenuator filter and detector window See Section 1 6 for a description on how to clean these parts 8 Photodetector Features 918D series detectors utilize Silicon extended Silicon Germanium and InGaAs photodiodes covering a broad wavelength range from 200nm to 1800nm These highly sensitive low noise semiconductor photodiodes enable measurements from the milli Watt down to the femto Watt regime The built in attenuator extends this range up into the 200mW to 10W range 44640 02RevD 5 5x7 5_44640 01RevA 5 5x7 5 qxd 8 12 10 3 15 PM Page 3 The 918D detectors are terminated with a 15 pin D Sub type connec tor and are designed for use with Newport s optical meter families 1928 C 1935 2935 C 1936 2936 C Series High Performance Optical Power Energy Meters Including the 1935T C 2935T C and 2935T C 1 1931 2931 C Series High Performance Optical Power Meters 1918 C High Performance Ha
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