HP 5528A - Page 354

Model 5528A
Measurements Using a Plane Mi rror Int erf ero m eter
Alignment Aids
To help in aligning the pl ane mi rr or interferometer, two alignme nt aids are includ ed. They are:
• A li gnme nt Target (PIN 10702- 600( 1) ( See figure D- 4)
• Alig nme nt Aid (P IN 10706-60001) (See Figure 0·4)
!loth alignment aids are ma gnetic to simplify positioning th em on the interferometer.
The
alignment tar ge t is used on the input si de of the interf~rometer to propedy position the
beam In the Input aperture.
The
alignment aid is pla ced on the exit ape rture (on the plane mirror conve rt er) to a ll ow using
the autoreficcUon method of a li gning the plane mirror interferom ete r. The alignment aid needs
to be propcdy oriented so that the primary mea s urement beam goes through the hole on the
alignment ald. The primary measurement beam is the first of two measurement beam s that go
between the Interferometer and the pl ane mirror. To find the primary beam, block one of th e
t
wo measurement beam s and if th e other disappears, th en th e one blocked Is the pri mary
measur ement beam.
ALIGNMENT TARGET
PIN 10702·60001
ALIGNMENT AIO
PIN 10706·60001
Fi gu re 0-4. I-IP 10 706A Alignment Aids
Alignment Procedure
Refer to Figure 0 -5 during th is procedure. The procedure given is the ovedapping dot s method.
SE RIES 2732A
1. Al ig n the plane mirror perpendi cu lar to the axis of travel.
2. For straight through co nfi gura ti ons, align the l aser beam perpendicular to the plane
mirror by aUlorefiection.
D·l