Pasco OS-9257A PRECISION INTERFEROMETER Manuel d'utilisateur télécharger pdf (Page 12)

Precision Interferometer 012-07137A

OS-9255A

PRECISION

INTERFEROMETER

-5

ADJUSTABLE MIRROR

MICHELSON, TWYMAN-GREEN

18 mm FL LENS

VIEWING SCREEN

MICHELSON, TWYMAN-GREEN

1 div = 1 MICRON

OS-9255A

PRECISION

INTERFEROMETER

-5

ADJUSTABLE MIRROR

MICHELSON, TWYMAN-GREEN

BEAM

LITTER

ICH

LSO

COMPENSATOR

ICHELSON

18 mm FL LENS

VIEWING SCREEN

MICHELSON, TWYMAN-GREEN

1 div = 1 MICRON

Twyman-Green Mode

1. Set up the interferometer in the Michelson mode, as

described above.

2. Remove the pointer from the rotational componet

holder. (It is recommended to store the pointer, washer

and thumbscrew in the storage case.) Place the compo-

nent holder between the beam-splitter and the movable

mirror (see Figure 7). It attaches magnetically. Mount a

second 18 mm FL lens (L

) on its magnetic backing

and position it .

3. Remove the original lens (L

) from in front of the laser.

Observe the two sets of dots on the viewing screen

one set from the movable mirror and one set from the

adjustable mirror. Adjust the position of L

until both

sets of dots are the same size.

4. Adjust the tilt of the adjustable mirror until the two sets

of dots coincide.

5. Replace lens L

in front of the laser. Move the viewing

screen so it's at least 12 inches from the edge of the

interferometer base. Fringes should appear in the bright

disk of the viewing screen. Fine adjustments of L

may be necessary to find the fringes. A piece of white

paper or cardboard can be used in place of the viewing

screen. A 48 mm FL convex lens may also be used to

magnify the projected image of the fringes.

Fabry-Perot Mode

1. Align the laser and interferometer base as described in

Laser Alignment at the beginning of this section. The

laser beam should be approximately parallel with the

top of the base, should strike the center of the movable

mirror, and should be reflected directly back into the

laser aperture.

2. Mount the adjustable mirror where indicated on the in-

terferometer base and one component holder in front of

the movable mirror. See Figure 8.

3. Place the other component holder behind the movable

mirror and attach the viewing screen to its magnetic

backing. You should see several images of the laser

beam on the viewing screen.

4. Using the thumbscrews, adjust the tilt of the adjustable

mirror until there is only one bright dot on the screen.

5. Now mount the 18 mm FL lens on the front compo-

nent holder. A clear sharp interference pattern should

be visible on the viewing screen. If you use light with

two component wavelengths, instead of a laser, two sets

of fringes can be distinguished on the viewing screen.

Lens

18mm FL

Figure 7. Twyman-Green Mode Setup

Rotational

component holder

Component

holder

Component

holder

Viewing screen

Adjustable mirror

Movable mirror

Lens

18mm FL

Figure 8. Fabry-Perot Mode Setup

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 27 28

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Pasco OS-9257A PRECISION INTERFEROMETER Manuel d'utilisateur Page 12

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