PASCO OS-9171 Manual de usuario

Instruction Sheet

Aligning the PASCO Model OS-9171 Laser with the

OS-9172 Alignment Bench

The Helium Neon Laser

The helium neon laser is a 0.5 mW, TEM00 mode laser,

providing randomly polarized light at a wavelength of 632.8

nm. The built-in power supply is regulated so the output has

minimum ripple and the intensity is stable to within ±2.5%.

A 15 minute warm up is required to reach full power, but the

power on start-up is greater than 0.35 mW. If you'd like

more technical specifications, and a detailed explanation of

laser operation, see the instruction manual that's included

with the laser.

Caution: This is a relatively safe, low power

laser. Nevertheless, we strongly recommend the

following precautions:

1. Never look into the laser beam, either directly, or

as it is reflected from a mirror.

2. Set up experiments so the laser is either above or

below eye level (for both sitting and standing

people).

To Set Up the Laser using the Laser Alignment

Bench:

The laser is most conveniently aligned using the laser

alignment bench, which can be joined to the optics bench

using the bench couplers. The procedure is as follows:

1. Place the optics bench and the laser alignment bench

end to end, as shown in Figure 1. Notice that only one

end of the laser alignment bench has holes for two

leveling screws. That is the end that joins to the optics

bench.

2. Remove the four leveling screws on the adjoining ends

of the two benches.

3. Use the 1/4-20, hex-head screws that are included with

the bench couplers to attach the couplers to the legs of

the benches, as shown. Do not yet tighten the screws.

4. Insert one of the leveling screws, rubber foot down,

through the threaded hole in each coupler.

Figure 1 Connecting the Laser Alignment Bench

Laser

alignment

bench

Top View of Bench Coupler

Bench coupler

Leveling Screw

and lock-nut

1/4 20

hex-head

screw

Optics

bench

Optics bench

012-01562C

9/91

$1.00

Bench coupler

(one each side)

Laser alignment bench

Leveling screw

scientific

012-01562C

5. By adjusting all five leveling screws (one on the laser

alignment bench, two on the optics bench, and two on

the bench couplers), align the two benches so they are in

a straight line. Use a meter stick or a long straight edge

on top of the benches to check vertical alignment, and

on the side of the bench to check horizontal alignment.

6. When the benches are aligned, tighten the lock-nuts on

all the leveling screws, and also tighten the four hex-

head screws. After tightening the screws, recheck the

alignment.

To Align the Laser (so the laser beam is coincident

with the optical axis of the bench):

1. Place a piece of masking tape or tape a piece of paper

over the square hole on the front of a component holder,

as in Figure 2. Make a small dot on the tape or paper, in

the center of the square hole (1-inch from the top of the

component shelf, and 1.5-inch from the edge of the

component holder).

2. Place the laser on the alignment bench, as in Figure 3.

Center the laser on the bench, and make sure it is

reasonably parallel with the bench.

3. Place the component holder on the optics bench, about

10 cm from the laser aperture. Make sure that the

component holder is flush against the alignment rail of

the bench. The dot on the tape now marks the optical

axis of the bench.

4. Turn on the laser, and move the aperture end of the laser

sideways, as needed, so that the laser beam falls on the

dot.

1.5"

Figure 2 Locating the Optical Axis

5. Move the component holder about 90 cm away from the

laser aperture. Again, be sure the edge of the compo-

nent holder is flush against the alignment rail of the

bench.

6. Without moving the aperture end of the laser, move the

rear end of the laser as needed to recenter the laser beam

on the dot. (You may also need to adjust the leveling

screws on the laser alignment bench in order to center

the laser beam vertically on the dot.)

7. Repeat steps 3 through 6 until the laser beam is aligned

with the dot for both positions of the component holder.

Alignment bench

Figure 3 Aligning the Laser

Tape

paper

Laser

Dot

Component

holder with

alignment dot

Optics bench

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