base Laser beam n Component holder VIEWING SCREEN MICHELSON, TWYMAN-GREEN (optional) OS-9255A n P i Slide the rear of the laser laterally on the Beam alignment bench until splitter the beam is reflected straight back into the laser aperture. Lens or ADJUSTABLE MIRROR MICHELSON, TWYMAN-GREEN Movable mirror Figure 5. Aligning the Laser 1 div = 18mm FL NOTE: For ease of installation the placement of the individual components in the various modes is Thumbscrews indicated on the label. beam is reflected to the fixed mirror. Adjust the Michelson Mode angle of the beam-splitter as needed so that the 1. reflected beam hits the fixed mirror near its center. Align the laser and interferometer base as previously described. The laser beam should be approximately 4. There should now be two sets of bright dots on the parallel with the top of the base, should strike the viewing screen; one set comes from the fixed center of the movable mirror, and should be mirror and the other comes from the movable reflected directly back into the laser aperture. mirror. Each 2. set of dots should include a bright dot with two or Mount the adjustable mirror on the interferometer more base. dots of lesser brightness (due to multiple Position one component holder in front of the reflections). Adjust the angle of the beam-splitter laser. Place the other component holder opposite again until the two sets of dots are as close together the adjust- able mirror and attach the viewing as possible, then tighten the thumbscrew to secure screen to its mag- netic backing. See Figure 6. the beam-splitter. 3. Position the beam-splitter at a 45 degree angle to the laser beam, within the crop marks, so that the
Laser beam Component holder base VIEWING SCREEN MICHELSON, TWYMAN-GREEN OS-9255A (optional) Slide the rear of the laser laterally on the alignment bench until the beam is reflected straight back into the laser aperture. ADJUSTABLE MIRROR MICHELSON, TWYMAN-GREEN Movable mirror Lens Beam splitter Figure 5. Aligning the Laser 18mm FL 1 div = NOTE: For ease of installation the placement of the individual components in the various modes is indicated on the label. Thumbscrews Michelson Mode 1. Align the laser and interferometer base as previously described. 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 on the interferometer base. Position one component holder in front of the laser. Place the other component holder opposite the adjust- able mirror and attach the viewing screen to its mag- netic backing. See Figure 6. 3. Position the beam-splitter at a 45 degree angle to the laser beam, within the crop marks, so that the beam is reflected to the fixed mirror. Adjust the angle of the beam-splitter as needed so that the reflected beam hits the fixed mirror near its center. 4. There should now be two sets of bright dots on the viewing screen; one set comes from the fixed mirror and the other comes from the movable mirror. Each set of dots should include a bright dot with two or more dots of lesser brightness (due to multiple reflections). Adjust the angle of the beam-splitter again until the two sets of dots are as close together as possible, then tighten the thumbscrew to secure the beam-splitter. or P n i n
Precision%20InterferometerSum2014.docx