5th Harmonic - Del Mar Photonics
Contents
1. in accordance with Fig 2 Position the LG105 in such a manner that the pump beam passes through Aperture D1 and the BBO Crystal s center Verify this using a screen made from white paper placing it behind the cell The pump beam reflected by Mirror 5 marked bold on Fig 2 should pass through Aperture D3 Note 1 In order to avoid pump laser damage please make sure the beam is not reflected directly back from the BBO Crystal into the pump beam If necessary turn the LGIOS 2 3 in the horizontal plane Secure the LG105 using two Mounting Screws 10 from the Accessories Kit 5 Remove Aperture D3 Insert Aperture D4 With the help of Alignment Screws 14 position Folding Mirror 4 in order for the 2 beam to pass through the Alignment Aperture D4 This will provide 5a beam passage through the center of Output Window 7 Once full alignment is achieved withdraw the Alignment Apertures from the unit Note 2 Be sure the input beam parameters are in compliance with the requirements specified on page 7 6 Close the FHG Cover Switch on the Nd YAG laser for operation in the Q switch mode Turn the Fine Alignment Screw 16 for maximum output energy LG105 Fifth Harmonic Generator for Nd YAG Lasers 5 TROUBLESHOOTING FAULT 1 Low conversion efficiency or poor quality spot 2 Low stability of output beam CAUSE Crystal phase mismatching One of the optical elements is damaged Inadequate input parameters low2. from our factory If due to defects in materials and workmanship the product fails to perform to the manufacturer s published specifications or if a consumable is not free from defects in materials and workmanship when shipped from the factory Del Mar Ventures will at its option repair or replace the defective product or consumable without charge Del Mar Ventures reserves the right to complete repairs at the factory at any authorized repair facility or on the purchaser s premises To make a warranty claim within the applicable warranty period the purchaser shall contact Del Mar Ventures in writing or by phone immediately following discovery of the reason for the claim Del Mar Ventures 4119 Twilight Ridge San Diego CA 92130 Phone 858 755 6727 Fax 858 630 23276 E mail delmar sciner com http www sciner com 11 LG105 Fifth Harmonic Generator for Nd YAG Lasers The warranty is null and void if the unit is serviced or repaired other than routine maintenance as described in the User s Manual by any person not authorized by Del Mar Ventures In addition the warranty is null and void if the product is used other than as specified in the User s Manual or if the product is used with parts or accessories not specifically approved by Del Mar Ventures The warranty does not cover damage to optical surfaces caused by improper cleaning or by customer misuse of a product Use the original packing boxes to secure the
3. product during shipment 12 LG105 Fifth Harmonic Generator for Nd YAG Lasers APPENDIX SPARE PARTS 1 Alignment aperture 2 pcs 2 Alignment spanner 1 pcs 3 Mounting screws 2 pcs 13
4. LG105 Fifth Harmonic Generator for Nd YAG Lasers User s Manual Del Mar Ventures 4119 Twilight Ridge San Diego CA 92130 USA tel 858 755 6727 v fax 858 630 2376 e mail delmarv sciner com LG105 Fifth Harmonic Generator for Nd YAG Lasers CONTENTS INTRODUCTION 3 OPTIC SCHEMATIC AND DESIGN 4 SPECIFICATIONS 7 Input beam parameters LG105 parameters Parameters obtained during LG105 test INSTALLATION AND OPERATION 9 TROUBLESHOOTING 10 WARRANTY AND SERVICING 11 APPENDIX Spare Parts 13 LG105 Fifth Harmonic Generator for Nd YAG Lasers 1 INTRODUCTION The Fifth Harmonic Generator model LG105 is compatible with any pulsed Nd YAG laser and is designed to produce UV radiation at 213 nm The Nd YAG laser equipped with LG105 is a versatile device and in many applications can eliminate the necessity for excimer lasers Solid state technology that does not use toxic gases and costs less gives you the advantages of both consistent day to day operation and low maintenance A high quality BBO crystal is used in the LG105 as the non linear element providing up to 20 conversion efficiency into 213 nm The non linear crystal is placed in a special cell ensuring long lifetime of BBO without any degradation or breakage A harmonic separation system installed in LG105 provides nearly 100 spectral purity of the output at 213 nm The LG105 Fifth Harmonic Generator gives you not only high power output but also ex
5. S The outward view of the LG105 is shown below 42 The LG105 is a self contained unit that can be used with any Nd YAG laser that has the specifications listed in the table below REQUIRED INPUT LASER BEAM PARAMETERS Input pulse duration ns 5 8 Maximum allowed input beam diameter mm 6 Maximum allowed input energy density J cm2 532 nm 0 75 355 nm 0 75 Input beam polarization 532 nm vertical 355 nm vertical LG105 PARAMETERS FHG crystal BBO Crystal size mm 8x8x3 5 FHG conversion efficiency is dependable on input beam parameters see Table Parameters Obtained During LG105 Testing Output beam polarization at 213 2 nm vertical Output pulse duration 1 ns shorter than that of the input pulse Overall dimensions nm 204x153x63 LG105 Fifth Harmonic Generator for Nd YAG Lasers PARAMETERS OBTAINED DURING LG105 TEST Pump parameters Output Pump Pump Pulse Beam Output wavelength wavelength energy mJ duration ns diameter energy mJ nm nm mm 213 2 Testing Engineer LG105 Fifth Harmonic Generator for Nd YAG Lasers INSTALLATION AND OPERATION Place the LG105 at a distance of 5 10 cm from the pump laser Remove the cover Switch on the pump laser for operation in the free running mode Use low level power just enough for viewing the laser output Remove the caps from the Input and Output Windows Place Apertures D1 and D3 into the unit
6. cellent radiation stability mJ 0 5 amp L p3 i w a 3 a a 8 Time Hours Fifth harmonic output from the Nd YAG laser can be obtained by mixing either first and fourth or second and third harmonic radiation It is the later option that is implemented in the LG105 Fifth Harmonic Generator LG105 Fifth Harmonic Generator for Nd YAG Lasers 2 OPTIC SCHEMATIC AND DESIGN Figure 1 below shows the optical layout of the LG105 The view from above with cover removed is presented in Figure 2 The same components are shown in the same positions on both Figures Second and third harmonic radiation is directed through BBO Crystal 2 which is located inside Cell 1 refer to Fig 1 Dispersion Prism 3 divides the harmonics into three beams Mirrors 5 and 4 reflect the fifth harmonic radiation to separate it from the second and third Residual second and third harmonics unconverted in the BBO crystal are transmitted by Mirrors 4 and 5 into Dampers 8 Phase Rotator 6 converts 213 2 nm radiation with horizontal polarization into vertically polarized radiation for better harmonic separation Fig 1 LG105 Optical Schematic Se aS o a e e e me e e OOoOnNNN BW WD LG105 Fifth Harmonic Generator for Nd YAG Lasers 13 16 ik U S iS 18 17 13 Fig 2 LG105 Top View BBO Crystal Cell BBO Crystal Dispersion Prism Folding Mirror Folding Mi
7. energy high diver gence de polarization poor input beam quality Low stability of input beam REMEDY Turn the Fine Adjustment Screw on LG105 side panel for maximum output Replace faulty optics Check for input beam parameters and adjust them to required specifications Check for input beam stability and if necessary take steps to improve laser stability 10 LG105 Fifth Harmonic Generator for Nd YAG Lasers 6 WARRANTY AND SERVICING Del Mar Ventures warrants to the original purchaser that products specified herein will perform to the published specifications when used and maintained in accordance with the manufacturer s written instructions With respect to the LG105 unit the 12 month warranty period commences on the date of shipment Warranty includes cost free delivery of replacement parts and service maintenance by a manufacturer approved engineer Travel costs for on site service are not covered by warranty terms The Crystal and optics are warranted for a period of 90 days from the delivery date The BBO crystal shall be free from defect in material and workmanship when shipped from our factory Replacement components purchased after the original warranty expiration shall be free from defects in materials and workmanship for three month from the date of shipment from our factory This warranty excludes optical components which shall be warranted as free from defects in materials and workmanship when shipped
8. rror Phase Rotator Output Window Dampers Hermetically Sealed BBO Crystal Cell Windows Mounting Apertures Aperture for Fastening LG105 and SOLAR LS Pump Laser to Optional Mounting Plate Connecting Pipe for Nitrogen Lancing Legs Alignment Screw for Mirror 4 Alignment Screw for Mirror 5 Fine Alignment Screw for Crystal Phase Matching Angle Protective Screens Mounting Screw Cover Removed Maximum efficiency of the fifth harmonic conversion is achieved when the third harmonic is at its highest intensity and when the crystal is properly LG105 Fifth Harmonic Generator for Nd YAG Lasers phase matched To adjust the BBO Crystal to phase synchronism use the Fine Adjustment Screw 16 Fig 2 on the LG105 laser side panel Four height adjustable Legs 13 provide for unit adjustment relative to the input beam Two Mounting Holes 10 beneath the unit are used to secure it to an optical table When pumped with SOLAR Nd YAG laser the LG105 laser is fastened to an optional mounting plate To adjust the height of the LG105 use Aperture 11 CAUTION The Fifth Harmonic Generator can produce ozone O3 in the laser beam s pathway To ensure safe working conditions take measures to pipe the laser beam and blow nitrogen N2 through the whole laser cavity To connect a nitrogen tank to the unit a Connecting Pipe is provided Pos 12 Fig 2 LG105 Fifth Harmonic Generator for Nd YAG Lasers 3 SPECIFICATION
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