Precision II Operation and Maintenance Manual
C
2-8
996-0255 rev. b
a. While still at reduced power, place a power meter
after port #2 and align 355 nm into center of detec-
tor head.
b. Using the RB601, adjust the SHG and then the
THG for highest energy.
c. Slowly bring system up to full power by setting
the CB630C delay to the value noted in step 5a.
d. Again, adjust harmonics for highest energy.
7) Harmonic installation is now complete and normal
system operation can begin.
Fourth harmonic generation
For Performance Parameters at 266 nm, see the data sheet in the front of
the manual:
Polarization >95% horizontal
Input Polarization 532 vertically polarized
Install the Second Harmonic Generator (SHG) Type II, labeled DS. The
crystal DSI can be used but the harmonic conversion efficiency may be
25% less. See procedure below.
1) Perform system Shutdown procedure (see page 2-2).
2) Locate the FHG labeled QS-B and SHG labeled DS and
install on indicated mount (see facing page).
To install:
a. Identify locking pins and guide pins on harmonic
generator and its face plate (see page 2-6).
b. Carefully align guide pins to the holes on the face
plate and then press the crystal housing firmly
against the crystal face plate.
c. Slide the locking lever on the face plate to secure
it to the crystal housing.
3) Locate the 266 dichroic stage. It should be parked in the
storage area located adjacent to the FHG (see page 2-5).
Install 266 nm dichroics stage in the 266 location behind
the FHG. Securely tighten the tall fastening knob on the
dichroic stage found on page 2-4.
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