Coherent light generators – Particular beam control device – Mode locking
Patent
1987-11-12
1990-09-04
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Mode locking
372 20, 372 32, 372 28, H01S 3098
Patent
active
049550268
ABSTRACT:
A method and apparatus for locking the frequencies of a number of first beams of coherent radiation from respective sources. Typically, the sources will form local oscillators in respective transmitters. The apparatus includes a reference beam generator such as a HeNe laser which generates a primary reference beam fed to an interferometer which generates a second, reference beam composed of a number of reference frequencies. This second reference beam is caused to interfere with each of the beams from the local sources in an optical coupler and the resultant beam is detected with a photodiode. The electrical output signal of the photodiode is filtered and fed to a discriminator which controls the frequency of the local laser. The discriminator controls the laser to maintain the relationship between the frequencies of the laser and the reference laser substantially constant.
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Instruments and Experimental Techniques, vol. 22, No. 2, part 2, Mar./Apr. 1979, (N.Y., U.S.), V. G. Gol'dort et al.: "Wide-band unit for phase-frequency locking of lasers", see FIG. 2, pp. 557-562.
Instruments and Experimental Techniques, vol. 21, Nos. 1/2, Jan./Feb. 1978, (N.Y.), U.S.; V. G. Gol'dort et al.: "Wide-Band Tunable Laser Locking System", pp. 213-216, See FIG. 1.
Hill Godfrey R.
Hunkin David J.
Smith David W.
British Telecommunications public limited company
Jr. Leon Scott
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