PASCO OS-8170A Brewster’s Angle Accessory User Manual

Page 8

Brewster’s Angle Accessory

Model No. OS-8170A

®®

Align the Laser Beam

1. Put a Laser Diode on the end of the bench opposite to the

Spectrophotometer Base.. Connect the laser’s power supply to a
grounded electrical outlet and plug the power cord into the laser.
Turn on the laser (the ON-OFF switch is on the back of the
laser).

WARNING: Do not look directly into the beam of the

laser light source or reflected light from the laser light source, such
as from a mirror. Although the laser used in this experiment is of
low power, looking directly into the laser light source or its
reflected light from a mirror could cause eye damage. To avoid eye
injury, do not look directly into the laser beam and wear laser
protective goggles. For more information about laser safety, see
Appendix B of this manual.

2. Set the Spectrophotometer Arm so that 180 degrees on the

Degree Plate is next to the index mark. Set the Aperture Bracket
disk to slit #5. Use the x-y adjustment knobs on the back of the
laser to aim the laser beam at the center of Aperture Bracket slit
#5.

3. Place the Collimating Slits on the optics bench and adjust the slit position on the Collimating

Slits so that the laser beam passes through slit #5 and also still shines on slit #5 on the
Aperture Bracket disk (see Figure 5).

4. Adjust the Brewster’s Lens Mount so that the index line on the higher step of the Lens Mount

is aligned with the zero mark on the Pivot Plate.

5. Place the “D” Lens on the lower step of the

Lens Mount with the flat side of the lens
against the edge of the higher step. If the laser
beam is not still centered on slit #5 of the
Aperture Bracket, adjust the “D” Lens side-to-
side until the laser beam shines on slit #5.
Make sure the “D” Lens is firmly against the
step.t

6. Mount he Beam Splitter on the bench near the

center of the bench. Check that the transmitted
laser beam still illuminates the #5 slit on the
Aperture Bracket on the Spectrophotometer
Arm. If necessary, loosen the adjustment screws on the Beam Splitter holder and move the
holder to align the laser beam with slit #5 on the Aperture Bracket disk.

Figure 5: Laser and
Collimating Slits on bench

Laser

Collimating

Slits

Figure 6: Mount the Beam Splitter

Beam Splitter

2nd Optics

Bench