Q User Manual
Contents
1. Dyax cyeire ss Germany amp Other Countries Laser Components GmbH Tel 49 8142 2864 O Fax 49 8142 2864 11 into lasercomponents com www lasercomponents com Single Photon Counting Module COUNT Q User Manual Table of Contents Introduction Operation Handling single photon counting modules Electrical connections rear side Powering up the module Graphical user interface GUI FC PC fiber connection Mounting the Count Module Base plate Performance Spectral response Timing resolution Correction factor Technical Data Technical Specifications for COUNT Q module Absolute Maximum Ratings Interface information Support Recycling of old devices Product changes Ordering information O 40 sO sO O NNNOAGUGUGUQ U A A A O UO UUO N NN LASER COMPONENTS Dyax cyeire ss Germany amp Other Countries Laser Components GmbH Tel 49 8142 2864 O Fax 49 8142 2864 11 into lasercomponents com www lasercomponents com Single Photon Counting Module COUNT Q User Manual LASER COMPONENTS Introduction Laser Components COUNT Q series of Single Photon Counting Modules has been developed to offer a unique combination of high quantum efficiency wide dynamic range and ease of use for photon counting applications Combining a low noise InGaAs InP single photon avalanche diode with specially developed quenching and signal processing electronics developed together with AIT GmbH the module offers everythi2. This is for the 12V DC power adapter COUNT QPSU included The appropriate cable from the COUNT PSU is connected here The appropriate mating connector is the LEMO FGG 1B 304 CLAD72 ZN 2 USB cable The USB cable is connected to the computer and provides interaction between the GUI LabView User Software and USB cable included and the module to set quantum efticiency and dead time 3 TTL signal output SMA Use a double shielded RG233 U coaxial cable to connect this signal Adapter SMA BNC is included Note the output should be terminated into a 50 Ohm load Powering up the module Before powering up the module it is strongly advised to make sure that no light reaches the sensor In order to power up the module simply plug in the AC adapter in the power supply connector After power on allow approximately 3 minutes settling time in which the sensor will be cooled down to its operating temperature Note the COUNT Q will not generate any output signal until the operating temperature has been reached Graphical user interface GUI For starting the LabView driver for the COUNT Q module it is necessary to download and install the LabView Run time Engine trom National Instruments site below for tree htto joule ni com nidu cds view p id 3433 lang en The NI downloader gives the executable LVRTE20 2t3std_downloader exe Save tile and then double click for local installation start This action requires the registra
3. View sottware During this dead time the COUNT Q is blind and cannot detect turther photons As a consequence the measured counting rate is lower than the true actual counting rate The actual counting rate can be calculated from the measured counting rate as follows measured ae E 1 R T measured Detectors Germany amp Other Countries Laser Components GmbH Tel 49 8142 2864 O Fax 49 8142 2864 11 into lasercomponents com www lasercomponents com Single Photon Counting Module COUNT Q User Manual LASER COMPONENTS The dead time effect can also be seen as a nonlinearity of the ratio between the actual counting rate and the measured counting rate Given a dead time and equation 1 it is possible to calculate a correction factor as a tunction of the measured count rate as shown in figure 2 D correction factor PJ io a th T j co oo 1000 10000 100000 1000000 measured count rate counts second Figure 2 Correction factor calculated for a dead time of 1 ps Dyacyeire ss Germany amp Other Countries Laser Components GmbH Tel 49 8142 2864 O Fax 49 8142 2864 11 info lasercomponents com www lasercomponents com Single Photon Counting Module COUNT Q User Manual Technical data Technical specifications for COUNT Q module Parameter Spectral range Dark count rate Photon detection efficiency at 1550 nm Timing resolution Atterpulsing probability Dead time
4. ling center for sate treatment WEEE Reg No De96457402 Product Changes LASER COMPONENTS reserves the right to make changes to the product s or information contained herein without notice No liability is assumed as a result to their use or application Ordering Information Products can be ordered directly from LASER COMPONENTS or its representatives For a complete listing of repre sentatives visit our website at www lasercomponents com Custom designed products are available on request
5. ng needed for single photon detection from 950 1600 nm Incoming photons generate corresponding electrical pulses which may be conveniently read out at the TTL output The FC connector provides a convenient method for connecting the module to the sample using a singlemode optical fiber Operation Handling single photon counting modules The avalanche photodiode inside the COUNT G is an extremely sensitive device It can be permanently damaged by overexposure to intense light A The COUNT Q contains a high voltage supply Users may be injured it the case is opened All internal settings are pre set the quantum efficiency and the dead time can be set individually using the LabView User Sottware Opening the case will invalidate the warranty Excessive light level e g daylight might damage a powered COUNT Q Precautions should be taken to avoid such situations VWhen the COUNT Q detector is mounted on another instrument ensure that the optical connection is lighttight Handle the COUNT Q detector with care Do not drop it or expose it to excessive mechanical shocks and vibra tions Dyax cyeire ss Germany amp Other Countries Laser Components GmbH Tel 49 8142 2864 O Fax 49 8142 2864 11 into lasercomponents com www lasercomponents com Single Photon Counting Module COUNT Q User Manual LASER COMPONENTS Electrical connections rear side 1 Power Supply 4 pin LEMO connector type EXG 1B 304 HLN
6. range TTL output pulse amplitude into 50 Ohm Supply voltage Supply current 950 Typ 1000 J30 Dark count rate and ofterpulsing probability vary with detection efficiency see Fig 2 and 3 2 Detection efficiency and dead time may be user defined via the supplied LabView software Absolute Maximum Ratings Supply voltage Operating temperature Storage temperature Count rate Typ LASER COMPONENTS Max 1600 Max 30 70 Unit nm Counts s ps US Unit V ae a MCounts s Single Photon Counting Module Detectors COUNT Q User Manual LASER COMPONENTS Cooling System signal Processing Digital Out Q LWL USB Temperature USE Controller Control Control Power Fig 1 Schematic block diagram of the COUNTE Q module Dark count rate cps 10 000 1 000 100 10 0 1 2 3 4 5 6 Fig 2 Typical dark count rate vs detection efficiency under normal operating conditions Afterpulsing probability 10 9 6s 8 7 6 8US 5 as 12us 3 2 1 16uUs 0 a Ee E z Se 0 1 2 3 4 5 6 QE Fig 3 Estimated atterpulsing probability vs detection efficiency under normal operating conditions Germany amp Other Countries Laser Components GmbH Tel 49 8142 2864 O Fax 49 8142 2864 11 info lasercomponents com www lasercomponent
7. rovides 4 mounting holes 2 holes each side plus 2 long mounting holes 1 hole each side with a diameter of 4 3 mm and 6 6 mm respectively T UNA Py Germany amp Other Countries Laser Components GmbH Tel 49 8142 2864 O Fax 49 8142 2864 11 info lasercomponents com www lasercomponents com DACAR Germany amp Other Countries Laser Components GmbH Tel 49 8142 2864 O Fax 49 8142 2864 11 info lasercomponents com www lasercomponents com Single Photon Counting Module COUNT Q User Manual LASER COMPONENTS Performance Spectral response The COUNT Q can be used to detect single photons in the spectral range between approximately 950 nm and 1600 nm The quantum efticiency can be set individually between O and 20 in this range Timing resolution The timing resolution depends on the HV quantum efficiency setting figure 1 The typical timing resolution for a quantum efficiency of 5 is 350 ps FWHM P Detector Jitter 0 3 E oa E r lt lt __ _ mes oF oe 796 oe 3 5 4 6 ome 5 19 3 t ns Figure 1 Detector jitter for different quantum efficiency settings The measurement is done with a source of correlated pairs of photons and a time tag unit plotting the histogram of the time differences Correction factor Every COUNT Q has an adjustable dead time from 0 1 ps to 5 us that can be set by the provided Lab
8. s com Dyax cyeire ss 08 14 V4 HW Icp countc usermanual Germany amp Other Countries Laser Components GmbH Tel 49 8142 2864 O Fax 49 8142 2864 11 into lasercomponents com www lasercomponents com Single Photon Counting Module COUNT Q User Manual LASER COMPONENTS Interface information Power Supply LEMO connector item number FGG 1B 304 CLAD72 ZN TTL output SMA connector compatible with SMA BNC adapter Optical input compatible with standard FC PC connector suitable for SM fiber core diameters up to lt 10 pm Support Your COUNT module has undergone thorough testing at Laser Components It is stable and reliable Nevertheless we continually make improvements that will be incorporated into future versions In any case we would like to offer you our complete support Please do not hesitate to contact Laser Components it you would like assistance with your system If you observe any errors please e mail a detailed description of the problem and relevant circumstances to into lasercomponents com Your feedback will help us to improve the prod uct and documentation Of course we also appreciate good news lf you have obtained exciting results with one of our systems please let us know and where appropriate mention us in your publications Recycling of old devices Waste electrical products must not be disposed of with household waste This equipment should be taken to your lo cal recyc
9. tion with a valid email address Same procedure for the site htto joule ni com nidu cds view p id 3342 lang en If LabView and NI VISA Runtime Engine are installed each new version of the GUI is executable MyQdetect exe MyQdetect ini Starting MyQdetect exe displays the available information about the detectors that are connected at the moment max 8 in plug amp play mode Single Photon Counting Module Detectors COUNT Q User Manual LASER COMPONENTS The unique serial number the type of the detector are shown on the lett side The user can change the dead time max 5 ys and or the quantum efficiency percentage max 20 for the current session The button on the bottom Disconnect Devices hangs up the line for a short while making it possible to communicate for example through a hyperterminal communication port hard lock STOP ends the application With the STORE button an adjusted operating point dead time and quantum efficiency can be stored in the module This operating point will be active if the module is not controlled with the GUI and is run only by connecting the power supply By starting the GUI again new settings can be chosen FC PC fiber connection The FC connector version is pre aligned tor SMfibers of core diameter lt 10 ym and requires no further optimization Mounting the COUNT Q module Base plate The base plate of the COUNT Q p
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