Cleaved-coupled-cavity-laser-driven system for measuring small s

Details Cleaved-coupled-cavity-laser-driven system for measuring small s Cleaved-coupled-cavity-laser-driven system for measuring small s

1985-03-06

1986-12-30

McGraw, Vincent P.

Optics: measuring and testing

By particle light scattering

With photocell detection

250205, 372 32, G01B 902, H01S 313

Patent

active

046325522

ABSTRACT:
A laser-driven interferometric signal sensing system has a cleaved-coupled cavity laser with separate stabilization servo loops of different time constants for the modulator and laser sections thereof. The laser section is biased above lasing threshold, and its stabilization loop is operated at a frequency twice the frequency of laser section bias current modulation. A laser loop feedback error signal is a function of predetermined, environmental-type, parameter variations in the sensing location and is processed to be a function of the second derivative of interferometer output intensity with respect to laser section current. That error signal is applied to modify laser section bias current in a direction to zero out the feedback signal.

REFERENCES:
"Signal Stabilization of Optical Interferometric Hydrophones by Tuning the Light Source", Applied Optics, P. Shajenko et al., Jun. 15, 1980, pp. 1895-1897.
"Active Stabilization of a Michelson Interferometer by an Electrooptically Tuned Laser", Applied Optics, A. Olsson et al., Jun. 15, 1980, pp. 1897-1899.
"Direct Frequency Modulation in AlGaAs Semiconductor Lasers", IEEE Journal of Quantum Electronics, S. Kobayashi et al., 1982, pp. 582-595.
"High-Speed Direct Single-Frequency Modulation with Large Tuning Rate and Frequency Excursion in Cleaved-Coupled-Cavity Semiconductor Lasers", Applied Physics Letters, W. T. Tsang, Apr. 15, 1983, pp. 650-652.
"Active Spectral Stabilization of Cleaved-Coupled-Cavity (C.sup.3) Lasers", Journal of Lightwave Technology, N. A. Olsson et al., Feb. 1984, pp. 49-51.

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