By C. Bradley Moore
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41. Bekov, G. , Letokhov, V. , and Mishin, V. , Opt. 39. 42. 43. 44. 45. Teor. Fiz. Commun. 23, 73, 157 (1977) [Sov. Phys. JETP 46, 81 (1977)]. 85 (1977). Stebbings, R. , Dunning, F. , and Rundel, R. , in "Atomic Physics IV," Vol. 4, (G. ), p. 713, Plenum Press, New York-London (1975). Stebbings, R. , Science 193, 537 (1976). Bekov, G. , Letokhov, V. , Matveev, O. , and Mishin, V. , ZhETF Pis'ma Red. 28, 308 (1978) [JETP Lett. 28, 283 (1978)]. Bekov, G. , Vidolova-Angelova, E. , Letokhov, V. , and Mishin, V.
Because the refractive index of air is not known accurately enough, we evacuate the region where the carriage moves to a sufficiently low pressure (a few Torr). We have found that it is easy to measure an infrared wavelength to 10 -3 cm-1 , and careful alignment of the Structural Studies by Laser Spectroscopy 49 Counter «-- | Gate | t P. L. 2. A schematic diagram of a high-resolution wavelength meter for infrared lasers. The single-frequency He-Ne laser beam used as a standard is made colinear with the infrared laser beam by a ZnSe beam splitter (1) and both beams, after being split in two by a ZnSe (2) plate, are fed into a Michelson interferometer, which consists of corner reflectors and four flat mirrors, MM.
The carriage on which the corner cubes are mounted is driven by a motor under vacuum. Two slits, one each before and after the inter ferometer, are indispensable in reducing alignment errors. The two beams are recombined again by ZnSe (2). The He-Ne beam is separated from the IR beam by a Ge plate. ). When the He-Ne fringe counts reach a preset number, a gate stops counting the infrared fringes. infrared beam improves the precision by an order of magnitude. Etalons are useful in making interpolation between two reference lines or in measuring the separation between two close-lying absorption lines.
Chemical and Biochemical Applications of Lasers by C. Bradley Moore