Laser device tuned by forming a refractive index grating in optical fiber

摘要

A resonant laser device including first and second reflectors defining an optical cavity with given optical resonance characteristics. The laser device including a laser active material in a first optical fiber disposed between the reflectors in the cavity and a second photosensitive optical fiber coupled to the cavity. One of the reflector being a refractive index grating formed in the second fiber such that the laser operates with a selected predetermined wavelength and the laser being tuned to a different wavelength by exposing the second fiber to a second spatially periodic pattern of optical radiation such that the second pattern becomes recorded in the second optical fiber.