Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1987-06-08
1989-08-08
Sikes, William L.
Coherent light generators
Particular beam control device
Optical output stabilization
372 9, 372 29, H01S 313
Patent
active
048560090
ABSTRACT:
The disclosure is directed to a method and apparatus for precisely controlling the frequency of a laser, and for precise control of distance. In a disclosed embodiment, a laser beam is split, modulated to obtain a frequency differential, and coupled to an interferometer which is designed to produce two processed beams having intensities that vary at the same ac frequency, but at a phase difference that is indicative of the laser frequency. The processed beams are converted to ac electrical signals which are coupled to phase control circuitry. The phase control circuitry determines the phase between the electrical signals and produces a control signal for controlling the laser frequency. Phase offset increments are introduced in the phase detection process, these phase offset increments resulting in controlled changes in the laser frequency. The laser frequency can be computed and read out as a function of the phase offset increments. In another embodiment, the control signal is used to accurately control a distance.
REFERENCES:
patent: 3445787 (1969-05-01), Hotz
"P-1--The Laser Absolute Wavelength Standard Problem", J. Hall, J. Quant. Electr. QE-4, 638, 1968; pp. 638-641.
"Precise Frequency Synthesizer Scanning of a Single Tunable Laser Using Electrooptic Modulation Techniques", M. D. Rayman et al., J. Opt. Soc. Am., Proceedings of 1985; vol. 2, No. 13, p. 18.
"A New Method for Frequency Calibration and Control of a Laser", P. Juncar, et al., Opt. Comm., vol. 14, No. 4, Aug. 1975, pp. 438-441.
"Instrument to Measure Wave Numbers of CW and Pulsed Laser Lines: The Sigmameter", P. Juncar et al., Rev. Sci. Instr., vol. 53, No. 7, Jul. 1982; pp. 939-948.
"Paraxial Ray Analysis of a Cat'-Eye Retroreflector", J. J. Snyder, Appl. Opt., Aug. 1975; vol. 14, No. 8, pp. 1825-1827.
"Pulse Swallowing Revisited", C. Alford, Fairchild Journal of Semiconductor Progress, vol. 3, pp. 10-12, Jul. 1975.
"Angstrom Measurement with Velocity of Light Compensation, Etc.", Hewlett Packard Journal, p. 18, Dec. 1971.
"Laser Wavelength Meters", J. J. Snyder, Laser Focus, pp. 55-61, May, 1982.
"A Two-Hundred-Foot Yardstick with Graduations Every Microinch", J. N. Dukes et al., Hewlett Packard Journal, Aug. 1970; pp. 2-9.
"High Precision Wavelength Meter with Fabry Perot Optics", N. Konishi et al., Appl. Phys., 25, 311-316, 1981.
"Compact High-Accuracy Wavemeter", R. Salimbeni et al., Optics Letters, Feb. 1980, vol. 5, No. 2, pp. 39-41.
"Computer Controlled CW Laser Spectrometer", C. R. Pollack et al., Applied Optics, Jun. 15, 1979/vol. 18, No. 12; pp. 1907-1912.
"Computer Controlled Fabry-Perot Wavemeter", A. Fischer et al., Optics Communications, Nov. 1, 1981; vol. 39, No. 5, pp. 272-282.
"Linear Scan Control of Tunable Lasers Using a Scanning Fabry Perot", M. J. Coulombe et al., Applied Optics, May 15, 1979; vol. 18, No. 10, pp. 1505-1512.
"Fizeau Wavemeter", J. J. Snyder, SPIE Conference on Optics, vol. 288; Apr. 1981; pp. 258-262.
"Multiple-Wedge Wavemeter for Pulsed Lasers", L. S. Lee et al., Optics Letters, 6, 610, 1981; pp. 610-611.
"An Improved Wavemeter for CW Lasers", F. V. Kowalski et al., J. Opt. Soc. Am., 68, 1611, 1978; pp. 1611-1612.
"Consequences of Light at the Interface, etc.", R. M. Azzam, J. Opt. Soc. Am. 68, 1613, 1978, p. 1613.
"A 10-THz Scan Range Dye Laser, etc.", G. H. Williams et al., SICOLS Conference, Switzerland, 1983; pp. 1-13.
Burleigh Instruments Inc.-advertising literature; Sep. 1981; 12 sheets.
Molectron Corporation-advertising literature (2 sheets).
Lasertechnics-advertising literature (2 sheets), Nov. 1, 1982.
Hall John L.
Zhu Miao
Holloway B. R. R.
Novack Martin
Sikes William L.
University Patents Inc.
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