| US 7,576,908 B2 | ||
| Fiber device, wavelength converter and image forming apparatus | ||
| Shinichi Shikii, Nara (Japan); Hiroyuki Furuya, Nara (Japan); Kiminori Mizuuchi, Osaka (Japan); and Kauzhisa Yamamoto, Osaka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Jul. 05, 2007, as Appl. No. 11/822,443. | ||
| Claims priority of application No. 2006-186409 (JP), filed on Jul. 06, 2006; and application No. 2006-188875 (JP), filed on Jul. 10, 2006. | ||
| Prior Publication US 2008/0008431 A1, Jan. 10, 2008 | ||
| Int. Cl. G02F 2/02 (2006.01); H01S 3/10 (2006.01) | ||
| U.S. Cl. 359—326 [372/6; 372/21; 372/22] | 32 Claims |
| 1. A fiber device, comprising:
a laser cavity including a fiber containing a laser active substance, the fiber having at least one fiber grating formed therein;
a laser light source for emitting an excitation light to be incident on the fiber,
wherein the laser cavity shifts an oscillation wavelength of a fundamental wave of a laser emitted therefrom; and
a returning unit for returning a part of the fundamental wave of the laser emitted from the laser cavity to the laser cavity
and changing an amount of a return light to the laser cavity; wherein:
the fiber grating includes a first fiber grating arranged at a side of the fiber toward the laser light source and a second
fiber grating arranged at an emission side of the fiber; and
the laser cavity oscillates a first fundamental wave using a reflection light from the second fiber grating if the returning
unit causes the amount of the return light from the returning unit to fall to or below an amount of the reflection light from
the second fiber grating, while oscillating a second fundamental wave using the return light from the returning unit if the
returning unit causes the amount of the return light from the returning unit to exceed the amount of the reflection light
from the second fiber grating.
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