| US 7,545,837 B2 | ||
| One-dimensional illumination apparatus and imaging apparatus | ||
| Michio Oka, Tokyo (Japan) | ||
| Assigned to Sony Corporation, Tokyo (Japan) | ||
| Filed on Apr. 19, 2005, as Appl. No. 11/109,912. | ||
| Claims priority of application No. 2004-127181 (JP), filed on Apr. 22, 2004; application No. 2004-254425 (JP), filed on Sep. 01, 2004; and application No. 2005-088819 (JP), filed on Mar. 25, 2005. | ||
| Prior Publication US 2005/0238071 A1, Oct. 27, 2005 | ||
| Int. Cl. H01S 3/10 (2006.01) | ||
| U.S. Cl. 372—22 [372/21] | 15 Claims |
| 1. An transverse multiple mode laser comprising:
a pumping light source; and
a resonator including a laser medium and a wavelength conversion device,
a nonlinear optical crystal or a nonlinear optical device which constitutes said wavelength conversion device being irradiated
by a line beam obtained by exciting said laser medium in an elliptical transverse mode pattern to thereby obtain a one-dimensional
output light line ray; and wherein
said nonlinear optical device has a periodical poling structure, and
both end faces of said nonlinear optical device have been processed to have roughly a Brewster's angle with respect to the
incidence angle and emission angle of fundamental light, a reflector is provided at a position spaced from said nonlinear
optical device;
harmonic rays are generated in two directions having d33 phase matching, one harmonic ray is reflected by said reflector after
outgoing from said nonlinear optical device and emits from an end face on an opposite side of said nonlinear optical device
after being again incident on said nonlinear optical device, whereas the other harmonic ray emits from an end face of said
nonlinear optical device located on the opposite side of said reflector, and an angular difference is provided between said
harmonic rays so that said harmonic rays are not superimposed on each other.
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