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ORPHEUS User’s Manual

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Light Conversion

TROUBLESHOOTING GUIDE

This section lists the possible problems that might occur while operating ORPHEUS. With each

symptom possible causes and their solutions are presented.

9.1

White Light Generation Does Not Occur/Is Instable

Cause

Corrective action

Pump pulse intensity is too low/high

Refer to paragraph 7.5.

WLG substrate is damaged

Refer to paragraph 7.4.

9.2

Low Parametric Output or No Output at All

Cause

Corrective action

White light generation is instable/no generation

Refer to paragraph 9.1.

Second harmonic generation is inefficient

Refer to paragraph 9.3.

Motors are not at their intended positions

Reset all OPA motors thr

ough the “

Motors

”

section.

Beam misalignment inside ORPHEUS

Refer to paragraph 7.3 and contact Light Conversion
support team for an additional help.

9.3

Low Second Harmonic Generation Efficiency

Cause

Corrective action

SHG Crystal is not at phase matching angle

Optimize the

angle through “

Motors

”

section in the

WinTOPAS software.

Pump pulse compression is not optimal

Optimize the pulse compression of the pump laser while
monitoring the output power of second harmonic or
Signal.

Low pump pulse contrast

Adjust the timing of Pockels Cells while monitoring the
second harmonic of pump or Signal power.

Содержание ORPHEUS

Страница 1: ...ORPHEUS Collinear optical parametric amplifier of white light continuum User s Manual UAB MGF Šviesos Konversija Address Keramikų 2B LT 10233 Vilnius Lithuania Tel 370 5 2491830 E mail company lightcon com www lightcon com ...

Страница 2: ......

Страница 3: ...ing advice in case of problems The manual assumes that the ORPHEUS has been installed by a qualified service engineer The user is strongly advised not to attempt to perform a new installation or re installation of ORPHEUS by following this manual Information in this manual is believed to be accurate and reliable All information in this document is subject to change without notice In no event will ...

Страница 4: ...ORPHEUS User s Manual 4 support lightcon com Light Conversion ...

Страница 5: ...of the Second Harmonic of Pump 23 5 5 First Amplification Stage 24 5 5 1 The First Pass 24 5 5 2 The Second Pass 25 5 6 Second Amplification Stage 26 5 7 Output polarization 27 5 8 Wavelength Separators 27 5 9 Computer Controllable Motorized Stages 28 5 10 Computer Control of ORPHEUS 29 6 DAILY OPERATION 30 6 1 Setting the Wavelength 30 6 2 Optimizing the Output 30 7 OPTIMIZATION OF ORPHEUS PERFOR...

Страница 6: ...ORPHEUS User s Manual 6 support lightcon com Light Conversion 9 3 Low Second Harmonic Generation Efficiency 38 10 DISPOSAL 39 10 1 Dismantling the System 39 10 2 Disposal 39 ...

Страница 7: ...tage from the side 24 Figure 18 A closer look at the amplified seed beam exiting the first amplification stage after the second pass Yellow is the amplified beam White WLC Green pump 25 Figure 19 Location of the manual Delay 3 adjustment protective screw 26 Figure 20 Wavelength separator WS with and without metal cover 27 Figure 21 Location and names of the motorized stages inside ORPHEUS 28 Figur...

Страница 8: ...azardous situation that if not avoided will result in death or serious injury WARNING Indicates a hazardous situation that if not avoided could result in death or serious injury CAUTION Indicates a hazardous situation that if not avoided could result in minor or moderate injury NOTICE Indicates information considered important but not hazard related e g relating to property damage Indicates danger...

Страница 9: ...power pulse energy by ORPHEUS may vary upon the type and model of pump laser used The average input power may be 20 W with pulse duration ranging from 100 to 300 fs Emitted radiation can be over 20 W 2 mJ and 10 300 fs pulse width The wavelengths emitted by present in ORPHEUS are 1030 nm 515 nm 620 3000 nm Additional frequency mixers extend the tunable range to 210 nm to 20 µm Be very careful when...

Страница 10: ...e laser operation area 1 2 Electrical Safety 1 Disconnect the power supply when working on any electrical equipment when it is not necessary for the equipment to be operating 2 Do not connect or disconnect any cables with the power supply connected to the mains electricity 3 Never work on electrical equipment unless there is another person nearby who is familiar with the operation and hazards of t...

Страница 11: ... Device identification label is located on the side of the ORPHEUS base below Manufacturer label 3 Warning logotype is located on the side of the ORPHEUS 4 Aperture label is located next to the output aperture of the ORPHEUS and points to it 5 Label for defeatably interlocked housing is located on the removable parts of the protective housing 6 Laser radiation warning logo is located at every inpu...

Страница 12: ...nts external power supply Voltage 100 240 VAC Frequency 50 60 Hz Max current 1 6 A Power requirements control board Voltage 24 VDC Max current 5 A Altitude Up to 2500 m Operating temperature 15 40 C Relative humidity 10 70 non condensing Table 4 Physical specifications Length 590 mm Width 230 mm Height 163 mm Weight 16 kg Input output port height 125 mm Optical beam path length 2 3 m From the inpu...

Страница 13: ...of input and output ports is presented in Table 5 There are also many smaller holes on ORPHEUS body which are used during alignment of the device They are not specially identified however it is possible that some radiation may leak through these apertures Therefore make sure that every alignment aperture is closed during normal operation Table 5 Description of ORPHEUS input output ports No In Out ...

Страница 14: ...ts Spatial temporal beam distortion In contrast to long pulse lasers astigmatism introduced by improperly aligned lenses of beam expanders reducers lead to distortion of temporal profile of the pulse across the beam This makes it impossible to overlap pump and signal pulses over entire beam aperture in ORPHEUS Tilted pulses This phenomenon manifests itself in similar way as that discussed above Ho...

Страница 15: ...nd pump laser The beam from the amplifier is lifted to the input beam height level using a periscope Depending on the system layout the periscope may direct the beam straight forward or at a 90 degree angle Mirrors BRM1 and BRM2 direct the beam to the ORPHEUS The output beams exit the housing at the same height as the input beam 4 2 Fixing ORPHEUS on the Optical Table ORPHEUS housing is fixed onto...

Страница 16: ...tcon com Light Conversion Figure 5 Location of the three balls on which the device rests Figure 6 Positioning the feet of ORPHEUS on the optical table SI system Figure 7 Positioning the feet of ORPHEUS on the optical table Imperial system ...

Страница 17: ... the position can be locked by tightening the locking screws Figure 8 Location of the adjustment screws on the beam routing unit The periscope consists of two mirrors and only the top mirror is coarsely adjustable This mirror should be only adjusted once during the installation to keep the beam parallel to the optical table All enclosed beam routing units periscope and shutter are interconnected w...

Страница 18: ...ard of ORPHEUS Figure 11 ORPHEUS extension plates A or B and shutter connector C The sequence of connecting the ORPHEUS should be as follows 1 Water cooling to the water cooled beam blocks if applicable 2 External devices Mixers LYRA etc to the extension plate 3 Shutter cable to the dedicated shutter connector 4 USB cable 5 Power supply cable 6 Install WinTOPAS from your USB flash disk 7 Turn on t...

Страница 19: ...ld blink with intervals of 1 second during normal operation of the USB control board The software needs to be configured for a device hardware settings file must be linked in the software Consult the WinTOPAS user s manual on software configuration A single computer can control up to 5 of the USB control boards A USB hub can be used if the computer does not have enough USB ports Light Conversion d...

Страница 20: ...e WARNING Always keep the control board powered for the shutter to operate correctly and for the WinTOPAS to display correct shutter status 4 6 Interlock ORPHEUS is equipped with an interlock mechanism It is impossible to open the shutter when the interlock is active The interlock is activated when an electrical circuit is broken which happens when ORPHEUS cover is opened This releases the button ...

Страница 21: ...ump parameters which should not change by more than 10 for ORPHEUS to operate A decrease of pump pulse intensity might lead to lower efficiency of ORPHEUS narrower spectral widths or even no output if white light generation cannot be obtained An increase of pump pulse intensity poses a risk of damaging several optical components and non linear crystals If it is needed to operate ORPHEUS at differe...

Страница 22: ...e 15 Optical layout of ORPHEUS iris aperture compensator amplification crystal dichroic mirror delay plate L M P RP RS lens mirror polarizer half wave plate reflection shield SHG Crystal TD WLG second harmonic generation crystal temporal dispersion medium white light generation substrate ...

Страница 23: ...he white light continuum The reflected residual pump is blocked inside DM1 mount Lens L3 is used to ensure proper diameter of the WLC at the amplification crystal Crystal 1 The pulse width of the continuum pulse at lens L2 is roughly the same as the initial pump pulse 300 fs The TD element disperses the white light in time due to group velocity dispersion different wavelengths travel through the s...

Страница 24: ...on Stage The pre amplifier is used to produce stable and sufficiently bright seed pulses for the second amplification stage It employs a two pass configuration using a single nonlinear Crystal 1 The beam path of the pump in the preamplifier first pass L4 Crystal 1 L5 M14 M15 M16 M17 second pass M16 M17 M15 M14 L5 Crystal 1 C1 L4 The beam path of the white light continuum first pass L4 Crystal 1 L5...

Страница 25: ... time they travel through the C1 compensator crystal This crystal is used to compensate the spatial drift of the amplified WLC due to the rotation of nonlinear crystal Crystal 1 After C1 the beams arrive at L4 where they are 5 mm above their first pass counterparts The residual pump beam then hits the mirror M13 and is blocked by the reflection shield The amplified WLC beam travels above the M4 mi...

Страница 26: ...t Crystal 2 Dichroic mirror DM2 transmits the seed and reflects the pump beam After amplification at the nonlinear crystal parametric radiation is separated from the pump beam by mirror DM3 and is emitted from output port A of ORPHEUS The pump beam reflected by polarizer P2 and mirror M18 propagates to folding mirrors M19 M20 and M21 Beam height at these mirrors is 25 mm from the base plate Half w...

Страница 27: ...m Vertical Idler 1030 2600 nm Horizontal 5 8 Wavelength Separators Duo to the collinear nature of amplification used in the power amplifier of ORPHEUS Signal and Idler waves both exit the housing at the same position and direction If only one of those is required for your application the beams can be separated by using optional wavelength separators WS Each WS consists of two dielectric mirrors wi...

Страница 28: ...nside the OPA device that control the angle or position of several optical components Additional wavelength extension modules will require extra motorized stages They are described in the manuals of those modules Currently up to 12 motors can be controlled by a single USB control board Figure 21 Location and names of the motorized stages inside ORPHEUS The figure above shows the positions of the m...

Страница 29: ...ial number of the device Download the latest version of WinTopas4 installer from Light Conversion website WinTopas4 preconf 18000 setup exe optional preconfigured installer consisting of all system devices configuration files and WinTopas4 software No separate WinTopas4 installation is required For more information downloads tutorial videos and instructions please visit WinTopas4 info page topas4i...

Страница 30: ...in the wavelength of interest and press Enter 4 Place an appropriate wavelength separator at the output of ORPHEUS to separate the Signal and Idler beams 5 Open the shutter by pressing the button in the software Please refer to the manual of WinTOPAS for more information on software operation and other ways to control the output of ORPHEUS 6 2 Optimizing the Output To optimize the power you should...

Страница 31: ...gnment of cavity lower output Pump pulse energy can be calculated from total power of pump laser and repetition rate Please check the installation documentation for pump pulse energy for ORPHEUS The profile of the beam should be at least visually inspected from time to time Hot spots in the beam profile diffraction patterns because of clipping might create small scale non linear effects or even da...

Страница 32: ...2 Resetting Motor Positions Reset of motor positions may be necessary after an electrical failure or software issues There is no feedback from the rotation translation stage to control card to monitor the exact position The feedback reset switch is only at the very beginning of total moving range of the stage Reset procedure of the motor double checks the absolute position of stage with respect to...

Страница 33: ...ath Depending on the intensity and repetition rate of pump used for white light generation the substrate itself can be damaged Quite usual indicator of the damage is the scattering of white light on surfaces of substrate normally look like dust particle stuck to the surface of substrate right on the beam position The damage might occur on the first or second surface of substrate If it is not possi...

Страница 34: ...2 iris to monitor white light 3 Release the screw holding the RP1 λ 2 plate adapter 4 Turn the adapter monitoring the WLC intensity stability and shape 5 Tighten the screw again Make sure the WLC has not changed after tightening White light should be stable and single filament there should be no interference patterns seen in the beam profile some rings can be seen around the central part they can ...

Страница 35: ...mp is when the SFL is barely visible or not visible at all Be very careful when rotating the half wave plate too high pump intensity could easily damage the nonlinear crystal Absence of SFL could also be an indication of inaccurate angle of the Crystal 1 crystal the Crystal 1 stage should be reset before increasing pump intensity 7 7 Applying Offsets for the Calibration Curve After minor alignment...

Страница 36: ...spectrum and or pulse width 7 Press Set Offset 8 Repeat steps 4 6 for other motors you want to apply an offset The offsets for each motor are stored in calibration configuration The settings of each calibration point remain unchanged The logic of setting the wavelength with and offset is the following 1 Lookup for the motor position from the calibration curve 2 Interpolate the position if in betwe...

Страница 37: ... 99 5 purity Do not attempt to clean surfaces of gold silver aluminum mirrors due to risk of damage 8 2 Handling of Nonlinear Crystals Nonlinear crystals used in ORPHEUS for generation of tunable pulses as well as crystals for second harmonic or sum frequency generation are fabricated of beta barium borate BBO or lithium triborate LBO These crystals are known to be hygroscopic Crystals used in ORP...

Страница 38: ...er to paragraph 9 1 Second harmonic generation is inefficient Refer to paragraph 9 3 Motors are not at their intended positions Reset all OPA motors through the Motors section Beam misalignment inside ORPHEUS Refer to paragraph 7 3 and contact Light Conversion support team for an additional help 9 3 Low Second Harmonic Generation Efficiency Cause Corrective action SHG Crystal is not at phase match...

Страница 39: ...protective gloves safety shoes goggles etc The electrical energy supplies must be disconnected and secured against being switched on again in accordance with relevant accident prevention regulations 10 1 Dismantling the System Dismantle the optical parametric amplifier in the following order 1 Switch off the device 2 Unplug the power supply cable 3 Remove all water from cooling system if applicabl...

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