ORPHEUS User’s Manual
Light Conversion support@lightcon.com 35
(a) (b) (c)
Figure 25. Low (a), medium (b) and high (b) intensity of white light generated in sapphire
substrate by 1030 nm radiation
Note that all the above illustrations are images taken at 100 kHz rep. rate. Images taken at lower rep.
rates, or beam profile viewed by eye may appear slightly different (a more reddish hue can be expected).
7.6 Adjusting the Pump Intensity for the First Amplification Stage
The intensity of pump for the pre-amplifier can be adjusted by rotating the half wave plate RP3:
Consult Support Team first before performing any adjustments!
1. Block the WLC beam.
2. Request 650 nm wavelength in the software.
3. Place a business card before the M5/M6 periscope.
4. Release the screw holding the adapter.
5. Turn the adapter while monitoring the intensity of SFL on the business card.
6. Tighten the screw and double check the SFL intensity.
The super-fluorescence should be viewed with goggles that block the green part of the visible
spectrum and transmit the red. The correct intensity of the pump 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 of ORPHEUS or small change in pump parameters the calibration curve can be
corrected by applying an offset for the motors involved. In most cases only the “Delay 1” motor should use
a calibration offset. If the offset is small enough – it can be also used for “Delay 2” and “Delay 3” motors.
However, the changes for those motors should first be compensated by adjusting the manual translation
stages of ORPHEUS. For “Delay 2” the “manual offset” is the M5/M6 periscope. For “Delay 3” – the
M22/M23 retro reflector. The position of these units is adjusted by a micrometer screw. For M5/M6 this
screw is accessible by hand when the cover is open. For M22/M23 the screw is adjusted with a 3 mm hex
key through the hole in the ORPHEUS body on the input side (see Figure 19).
An offset for “Crystal 1” or “Crystal 2” stages would most likely be necessary after nonlinear crystal
replacement.
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