User`s manual

5. If not, adjust rotation of the grating about it‟s face for best

vertical alignment to the A3 by carefully loosening the retaining

screw in the grating mount so that the grating holder can be

rotated in the mount. Caution: grating holder can fall from tilt

stage if this step is not performed carefully or if retaining

screw is too loose..

6. Reiterate between step 3 (adjust only the vertical tilt of the

mount) and step 4 (adjust only the rotation of the grating) until

no further adjustment is necessary.

COMPRESSOR ALIGNMENT

1. Use mirrors M6 and M7 to align the beam through the

apertures A3 and A2.

2. Rotate compressor grating angle so the angle between input

and diffracted beams is equal 22 degrees (rotation stage position

should be approximately at 25 degrees). The input beam entering

the compressor should be reflecting off the lower right corner of

the compressor grating G2 before entering the horizontal

retroreflector HR1, as shown in the Figure 10:

Figure 10. Femtosecond radiation pattern on the compressor

grating

3. The HR1 should be reflecting the stripe onto the lower left

side of the grating. If the side to side position is off, the lateral

position of the HR1 can be adjusted by loosening bolts holding

the HR1 assembly to the translation stage.

4. The first stripe should now reflect off the vertical

retroreflector VR2 before reflecting off the grating G2 a third

time. The third reflection on the grating should be a stripe on the

upper left side of the grating directly above the first stripe. If the