Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1991-06-28
1993-03-02
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
372 94, G01C 1966
Patent
active
051913909
ABSTRACT:
A ring laser apparatus for spontaneous-emission-free detection including several mirrors. Some of the mirrors including a first, second and third mirror are arranged to form a laser ring. A gain medium is located between two of the first, second and third mirrors within the laser ring. Radiation from an external radiation source impinges on a fourth mirror and is reflected to illuminate the gain medium. The gain medium thereby produces first and second oppositely traveling laser beams along first and second pathways, each of the pathways having equal path lengths. The first and second oppositely traveling beams each provide an output through one of the laser ring mirrors and are reflected into the beam splitter after respectively striking fifth and sixth mirrors. The gain medium comprises a gain layer having a thickness which is much smaller than a wavelength so that the oppositely directed first and second beams from the gain medium are highly coherent on the beam splitter. The beam splitter operates on the first and second oppositely traveling beams so as to provide a detection signal free of spontaneous emission noise to the detector.
REFERENCES:
patent: 3433568 (1969-03-01), Skalski et al.
"Theory of the Holographic Laser: Correlated Emission in a Ring Cavity", Krause and Scully, Physical Review A, vol. 36, No. 4, Aug. 15, 1987.
"Ring-Laser Configuration with Spontaneous Noise Reduced by Destructive Interference of the Laser Outputs", M. Lai and J.-C. Diels, Physical Review A, vol. 42, No. 1, Jul. 1, 1990, pp. 536-542.
"Quantum Noise Quenching in the Correlated Spontaneous Emission Laser As a Multiplicative Noise Process, 1. A Geometrical Argument", W. Schleich and M. O. Scully, Physical Review A, vol. 37, 1261 et seq., 1988.
"A Correlated-Emission Laser Gyroscope", Marlan O. Scully, Physical Review A, vol. 35, No. 1, Jan. 1, 1987, pp. 452-455.
"Novel Wavelength-Resonant Optoelectronic Structure and Its Application to Surface-Emitting Semiconductor Lasers", M. Y. A. Raja, S. R. J. Brueck, M. Osinski, C. F. Schaus, J. G. McInerney, T. M. Brennan and B. E. Hammons (USA), Electronics Letters, An International Publication, 1st Sep., 1988, vol. 24, No. 18, pp. 1140-1142.
Diels Jean-Claude M.
Lai Ming
Honeywell Inc.
Shudy Jr. John G.
Turner Samuel A.
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