Optical limiter including optical convergence and absorbing body

Details Optical limiter including optical convergence and absorbing body Optical limiter including optical convergence and absorbing body

1990-03-29

1992-01-14

Hille, Rolf

Optical: systems and elements

Optical modulator

Light wave temporal modulation

372 11, 359738, G02B 523, G02B 900, H01S 3113

Patent

active

050804693

ABSTRACT:
A lens (12) converges a light beam (16) into a light absorbing body (14) having a material which exhibits reverse saturable optical absorption distributed therein with a non-uniform concentration. The concentration is maximum at the focal point (20) of the converged light beam (16), and decreases toward the lens (12) with a distribution selected in correspondence with the optical gain of the converged light beam (16) to limit the local fluence of the light beam (16) propagating through the absorbing body (14), and the output energy of the light beam (16), to predetermined maximum values. The non-uniform concentration further produces a self-protecting effect by causing the region of maximum fluence of the converged light beam (16) to shift toward the lens (12), thereby protecting the region of highest optical gain and highest molecular concentration, as the input energy of the light beam (16) increases.

REFERENCES:
patent: 3620597 (1971-11-01), Schwartz et al.
patent: 4657345 (1987-04-01), Gordon
patent: 4723248 (1988-02-01), Harter et al.
patent: 4890075 (1989-12-01), Pohlmann
Applied Optics (Swope and Koester) 5/1965, pp. 523-526, vol. 4, No. 5, "Eye Protection Against Lasers".
"Optical Limiting in Solutions of Metallo-phthalocyanines and Naphthalocyanines", D. R. Coulter, et al., SPIE vol. 1105, Materials for Optical Switches, Isolators, and Limiters (1989), pp. 42-51.
Hagan et al., "Passive Broadband High Dynamic Range Semi-Conductor Limiters", SPIE vol. 1105, Materials for Optical Switches, Isolators, and Limiters (1989), pp. 103-113.
Tutt et al., "Optical Limiting Via Reverse Saturable Absorption in Metal Cluster Compounds", CLEO '89/Wednesday Morning, pp. 158-160, Apr. 26, 1989.
K. P. J. Reddy, "An Analysis of Pulse Propagation Through a Saturable Absorber Having Excited-State Absorption", Optical and Quantum Electronics 19 (1987), pp. 203-208.

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