Omega Volume VII-System Description, Руководство по эксплуатации

Страница: 30 / 40

Volume VII–System Description
OMEGA EP Operations Manual Page 2 of 35
The PAD laser and the dual wavelength SPDP laser are used in combination with compressor
alignment mirrors (CAM’s) in the pulse compressor to align the compressor. The tiled gratings in each
compressor are aligned using an interferometer in the GCC as shown in Fig. 1.16.
G6871J1
cw laser from SPDP Reference flat
T flat TGA4
Steering mirror rotates
and translates
TGA3
TGA1 TGA2
Figure 1.16
Integrated interferometers (one shown) in the GCC allow for the precision alignment of the tiles in each tiled-grating
assembly for each pulse compressor. Insertable CAM’s located before TGA1, between TGA’s 2 and 3 and after TGA4
support alignment of the TGA’s. A two-wavelength Littrow alignment procedure using the SPDP laser is used to align the
compressors.
Figure 1.15
The PAD is a self-contained, TIM-based diagnostic, portable between target chambers. A Shack–Hartmann sensor measures
the wavefront reflected off the OAP, the autocorrelator monitors the angular displacement of the PAD optics, and a pointing
diagnostic determines the location of target chamber center (TCC).
G6870J1
Flip in cross hair
Lenslet
array
Apodizer
Wave plate
TIM payload
TCC
OAP
30 mm
Wedges
Autocollimator mirror
Bubble
Auto
collimator
Fiber source
CCD
CCD