Chapter II – System Operation
2-7
C
996-0255 rev. b
Third harmonic generation
For performance parameters at 355 nm , see the data sheet in the front
section of the manual:
Polarization >95% horizontal
Input Polarization 1.06 4 µ horizontally polarized,
532 vertically polarized.
Install the Second Harmonic Generator (SHG) Type I, labeled DSI. See
procedure below.
1) Perform system shutdown procedure (see page 2-2).
2) Locate the THG labeled TS and SHG labeled DSI and install
on proper mount (see facing page).
To install:
a. Identify locking pins and guide pins on harmonic
generator and its face plate (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) Remove the 532 dichroic stage located between the SHG
and THG. Secure in the storage area.
4) Locate the 355 dichroic stage. It should be in the storage
area located adjacent to the FHG (see page 2-5). Install the
355 nm dichroics stage in the 355 location behind the THG
(see page 2-6). Securely tighten the tall fastening knob on
the dichroic stage (see drawing, page 2-4).
5) Turn down power of Precision II so that you can safely
check the optical alignment of the 1064 nm through the
SHG and THG and out of port #1. Check the alignment of
the 355 nm through port #2.
To reduce power:
a. Locate delay knob on front of oscillator CB630C
and note present reading.
b. Set delay to 550 µs.
c. Perform Daily Startup procedure (see page 2-1).
6) On RB601 adjust crystal position for maximum 355 nm
energy.
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