Light Conversion ORPHEUS, Руководство пользователя

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ORPHEUS User’s Manual
34 support@lightcon.com Light Conversion
Figure 23. Illustration showing a key inserted into the axial adjustment hole in the WLG
adapter.
If it is not possible to generate white light in fresh spot of substrate – proceed to the section
“Checking Pump Laser Parameters”. Probably the absence of white light is because of different pump
parameters.
7.5 Adjusting the Pump Intensity for White Light Generation
The intensity of pump for white light generation can be adjusted by rotating the half wave plate RP1:
1. Block the SHG beam path of ORPHEUS.
2. Set a business card after the A2 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 be ignored). If the intensity is
too high – white light might have “boiling” structure or interference fringes across the beam. If the intensity
is too low – white light might be instable, appearing/disappearing.
(a) (b)
Figure 24. No white light generation (a) and very low intensity of white light (b) are
indications that there is too little energy in the pulse, or the beam is focused improperly onto
the crystal