Patent ID: 8731011

Claim:
A precision optical frequency tunable laser comprising a laser gain medium, a laser cavity end mirror arranged on the laser gain medium, an intracavity collimating lens, an active optical phase modulator, a tunable acousto-optic filter and an intracavity total reflection mirror all arranged sequentially inside the laser cavity and in such a way that the light beam emitted from the laser gain medium can be diffracted twice by the tunable acousto-optic filter and a frequency shift introduced by the diffractions can be compensated, the laser further comprises: an active polarization rotator for controlling a polarization direction of linearly polarized incident light, the active polarization rotator is arranged on the opposite side of the tunable acousto-optic filter from the intracavity total reflection mirror to receive the diffracted light beam by the tunable acousto-optic filter; a polarization beam splitter arranged behind the active polarization rotator for total transmission of parallel polarized incident light and for reflecting vertically polarized incident light into a direction having an angle of 90 degrees with respect to the incident light; a first etalon and a first total reflection mirror, which are arranged in a direction vertical to the optic axis of the diffracted light beam by the tunable acousto-optic filter and used for receiving the vertically polarized light output by the polarization beam splitter and outputting the vertically polarized light to the first total reflection mirror, the first total reflection mirror and the laser cavity end mirror forming a first laser resonant sub-cavity, and a first temperature control system for adjusting the temperature of the first etalon is arranged on the first etalon; a second etalon and a second total reflection mirror, which are arranged in a direction parallel to the optic axis of the diffracted light beam by the tunable acousto-optic filter and used for receiving the parallel polarized light output by the polarization beam splitter and outputting the parallel polarized light to the second total reflection mirror, the second total reflection mirror and the laser cavity end mirror forming a second laser resonant sub-cavity, and a second temperature control system for adjusting the temperature of the second etalon is arranged on the second etalon; a radio frequency signal source used for providing radio frequency energy for the tunable acousto-optic filter and adjusting the oscillation wavelength of the laser resonant cavity by changing RF frequency; and a laser pumping source, an active optical phasemodulator drive source, an active polarization rotator drive source and a laser drive control circuit.