Patent ID: 7154920

Claim:
A broadly tunable laser beam generator comprising: a pump pulse laser; an output-coupling half-mirror configured to pass a pulse beam emitted from the pump pulse laser therethrough; a silica optical fiber configured to receive the pulse beam from the output-coupling half-mirror via a first collective collimator lens, the silica optical fiber having a birefringence and a cut-off wavelength from 1100 to 1300 nm; and a single-wavelength selecting element configured to receive the beam emitted from the silica optical fiber via a second collective collimator lens and feeding back a light with a specific wavelength, wherein the feedback light with the specific wavelength is received by the silica optical fiber via the second collective collimator lens, amplified to obtain a gain while propagating through the fiber twice, emitted from the fiber, converted into collimated light by the first collective collimator lens, and emitted from the output-coupling half-mirror as an output light beam.