Coherent light generators – Particular beam control device – Nonlinear device
Patent
1996-09-20
1998-03-24
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Nonlinear device
372105, 372 98, 372 92, H01S 310
Patent
active
057320950
ABSTRACT:
The ideal source for air-turbulence-corrected distance-measuring interferometry is a single laser that generate overlapping beams at two widely separated wavelengths .lambda..sub.1 and .lambda..sub.2. At least one of the wavelengths, as well as the wavelength ratio, must be known to high degrees of accuracy. Furthermore, at each wavelength, the Iaser should produce a pair of orthogonally polarized frequencies with a frequency splitting that is adjustable over the range of approximately 0.5 MHz to 20 MHz to facilitate AC interferemetric distance measurements with a variety of measurement-mirror velocities.
REFERENCES:
patent: 5047668 (1991-09-01), Bosenberg
patent: 5381427 (1995-01-01), Wedekind et al.
patent: 5404222 (1995-04-01), Sparta
patent: 5617246 (1997-04-01), Hiro
Measurement of the changes in air refractive index and distance by means of a two-color interferometer, by Hirokazu Matsumoto, Yucong Zhu, Shigeo Iwasaki, and Tadanao O'ishi Applied Optics, vol. 31, No. 22, 1 Aug., 1992 (pp. 4522-4526).
A"Twisted-Mode" Technique for Obtaining Axially Uniform Energy Density in a Laser Cavity by V. Evtuhov and A. E. Siegman, Applied Optics, vol. 4, No. 1, Jan. 1965 (pp. 142 & 143).
Second-harmonic interferometers by F. A. Hopf, A. Tomita, and G. Al-Jumaily, Optics Letters, vol. 5, No. 9, Sep. 1980 (pp. 386-387).
A Two-Hundred-Foot Yardstick with Graduations Every Microinch by John N. Dukes and Gary B. Gordon, Hewlett-Packard Journal, Aug. 1970, vol. 21, No. 12 (pp. 1-16).
The Refractive Index of Air by Bengt Edlen, Metrologia, vol. 2, No. 2, 1966 (pp. 71-80).
Interferometers AC vs DC, by John F. Beckwith, Late Oct. 1982, Sep. 1, 1982 (pp. 1-22).
Hewlett--Packard Company
Jr. Leon Scott
Kee Pamela Lau
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