Coherent light generators – Particular beam control device – Control of pulse characteristics
Patent
1985-06-11
1988-02-02
Wan, Gene
Coherent light generators
Particular beam control device
Control of pulse characteristics
372 11, 372 41, H01S 310
Patent
active
047232480
ABSTRACT:
An optical device that stabilizes the power in a cw laser beam comprises a material whose absorption coefficient increases wth increasing incident intensity. The same device acts as an energy limiter and pulse shortener for a pulsed laser. In either case, the device can be located either within the laser cavity or outside it. In another embodiment, the device is placed into the cavity of a passively mode-locked laser to permit mode-locking with laser materials that have high gain-saturation energy. Materials suitable for use in the device include Cr-doped crystalline solids and organic solutions, such as laser dyes, saturable absorber dyes, etc.
REFERENCES:
patent: 4633475 (1986-12-01), Harter et al.
R. H. Pantell et al., Appl. Phys. Lett. 11, 213 (1967) "Laser Power Stabilization by Means of Nonlinear Absorption".
S. A. Krysanov et al., Chem. Phys. Lett. 91, 77 (1982) "Ultrafast Formation of Transients in Spiropyran Photochromism".
J. Schwartz et al., Appl. Phys. Lett. 11, 242 (1967), (see also, A. Hordvik, IEEE J. Quantum Electron. QE-6, 199 (1970) "Effects of Internal Induced Absorption On Laser Emission" and Pulse Stretching Utilizing Two-Photon-Induced Light Absorption".
M. L. Shand et al., J. Appl. Phys. 52, 953 (1981) "Excited-state Absorption In The Pump Region of Alexandrite".
D. J. Harter et al., in Ultrafast Phenomena IV, Proceedings of the Fourth International Conference, edited by D. H. Auston et al. (Springer-Verlag, New York, 1984), pp. 102-104.
D. J. Harter et al., "Passive Mode-Locking with Reverse Saturable Absorption," presented at the Topical Meeting on Ultrafast Phenomena, Monterey, CA, Jun. 12-15, 1984.
Band Yehuda B.
Harter Donald J.
Samelson Harold
Shand Michael L.
Allied Corporation
Cortina A. J.
Fuchs G. H.
Wan Gene
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