TECHNIQUES FOR SUPER-MODE OSCILLATION

An evaluation was made of the FM stabilization system, making use of the odd harmonic FM beats to achieve absolute frequency stabilization of the FM carrier with respect to the center of the atomic gain profile. The system is able to provide stabilization of better that 1 part in 10 to the 8th power...

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Bibliographic Details
Main Authors: Targ,Russell, Caddes,D. E, Foster,J. D, French,J. M, Osterink,L. M
Format: Report
Language:English
Subjects:
FREQUENCY MODULATION
FREQUENCY STABILIZERS
GALLIUM ARSENIDES
LASERS
Lasers and Masers
MODULATION
MONOCHROMATIC LIGHT
NOISE
PHASE LOCKED SYSTEMS
REDUCTION
SEMICONDUCTOR DEVICES
STABILIZATION SYSTEMS
THEORY
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Summary:An evaluation was made of the FM stabilization system, making use of the odd harmonic FM beats to achieve absolute frequency stabilization of the FM carrier with respect to the center of the atomic gain profile. The system is able to provide stabilization of better that 1 part in 10 to the 8th power on a long-term basis with no net drift in the FM spectrum. The FM laser not only can be used to give stabilized single-frequency light, but also has other applications. In particular, the FM laser without stabilization is much more suitable for use as an optical carrier than is a free-running laser. The FM process couples the modes of the laser, reducing the low-frequency noise resulting from mode competition. The GaAs laser offers the possibility for the direct production of an FM laser without the need for introducing any additional material inside the laser cavity. A population inversion leading to gain and oscillation is created in GaAs by direct current excitation. Two ways of creating the time-varying component in the material's index of refraction which is the necessary condition for FM oscillation are by the electro-optic and photo-elastic effects. See also AD-640 143.