Patent ID: 7576908
Filing Date: 2009-08-18
Classification: G02F,H01S,H04N

Abstract:
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.