Coherent light generators – Particular resonant cavity – Specified cavity component
Patent
1998-04-30
2000-07-11
Font, Frank G.
Coherent light generators
Particular resonant cavity
Specified cavity component
372 22, 372 53, 372 70, 353 30, 353 31, 345 33, 345150, 349 5, 349 10, 349 33, 349183, H01S 308
Patent
active
060883804
ABSTRACT:
A high efficiency, narrow spectral linewidth lasing pixel device that implements a low-voltage spatially patterned variable loss element placed inside an optically pumped high-gain laser cavity is disclosed. The output properties of this system make it useful for digital projection displays. A method for producing a projection image is also disclosed, the method comprises the steps of: providing pump energy for exciting a gain medium disposed within a laser cavity; in response to the excitation, emitting optical energy from the gain medium, wherein the optical energy oscillates within the laser cavity; during an image mode, selectively activating regions of a pixelated loss element disposed in the laser cavity within an oscillation path of the optical energy; wherein when in an on-state, first regions of the pixelated loss element are made substantially transparent to allow the oscillating optical energy to travel through the first regions of the loss element, and wherein when in an off-state, second regions of the pixelated loss element are made reflective to scatter the oscillating optical energy encountering the second regions of the loss element; and outputting the oscillating optical energy that travelled through the first regions of the pixelated loss element to create the projection image.
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"A noval intracavity pixelated lasing projection system", Nabil Lawandy et al., Proceedings of SPIE Reprint--The International Society for Optical Engineering, vol. 3296, Jan. 1998, 84-91.
"Lasing pixels may form images in projection TV", Nabil Lawandy et al., Laser Focus World, May 1997, 137-141.
"Lasing pixels produce projection display", Kristin Lewotsky, Laser Focus World, Mar. 1997, 15.
"Colourful visions", The Economist, May. 16, 1998.
"Liquid-Crystal-Based Device Provides Brighter Projection Display", Photonics Spectra, Technology World Briefs, Feb. 1997, 50.
Font Frank G.
Inzirillo Gioacchino
Spectra Science Corporation
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