Method and apparatus for determining the wave number of optical

Details Method and apparatus for determining the wave number of optical Method and apparatus for determining the wave number of optical

1975-11-07

1978-04-18

Clark, Conrad J.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250550, G01B 902

Patent

active

040849074

ABSTRACT:
Method and apparatus for determining the wave number of optical spectrum radiation, particularly for use in controlling lasers. Two parts of a beam provided by a source to be monitored, particularly a laser, are directed to two double-wave interferometers. The differences of the optical path lengths .delta. of the interferometers are assigned a difference of .lambda./4 which corresponds to a phase difference of .pi./2. The two optical output signals emerging from the interferometers are converted into sinusoidal electrical waves in quadrature as a function of the wave number .sigma. = 1/.lambda. of the laser and the period 1/.delta. of the two sinusoidal electrical waves. The electrical waves are processed in suitable circuitry to obtain a modulo value 1/.delta. of the wave number. These steps are repeated for different values of .delta. so as to progressively eliminate uncertainty in the value of the wave number.

REFERENCES:
patent: 2604004 (1952-07-01), Root
patent: 3271676 (1966-09-01), Chitayat
patent: 3409375 (1968-11-01), Hubbard
patent: 3601491 (1971-08-01), Smith-Vaniz
White et al., Fundamentals of Optics, McGraw-Hill, 1957, (third edition) p. 282.

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