Broad band continuous tunable laser

A broad band continuous tunable laser comprising

• a first laser cavity mirror, a laser gain medium, an intracavity collimating lens, an active optical phase modulator, one tunable acousto-optic filter, an intracavity reflection mirror, a tunable Fabry-Perot filter, a second laser cavity mirror and a laser drive and control circuit system;
• the tunable acousto-optic filter consists of a single acousto-optic crystal, a single acoustic wave transducer bonded on a selected surface of the acousto-optic crystal and a radio frequency signal source;
• the tunable Fabry-Perot filter includes a first reflection mirror, a liquid crystal module, and a second reflection mirror;
• the first reflection mirror, and the second reflection mirror forms a Fabry-Perot cavity, the liquid crystal module is arranged inside the Fabry-Perot cavity;
• the intracavity collimating lens collimates the light beam outputted from the laser gain medium and inputs the collimated beam into the tunable acousto-optical filter at Bragg angle to generate the first diffraction after passing through the active optical phase modulator;
• the intracavity mirror is arranged on the opposite side of the acousto-optic filter from the laser gain medium to reflect the first order diffracted beam of the first diffraction by the tunable acousto-optic filter at the Bragg angle back to the tunable acousto-optic filter for second diffraction to compensate the optical frequency shift caused by the first diffraction;
• the tunable Fabry-Perot filter is arranged on the opposite side of the acousto-optic filter from the intracavity reflection mirror and in the optical path of the first order diffracted beam of the second diffraction by the tunable acousto-optic filter, the second laser cavity mirror is arranged on the opposite side of the acousto-optic filter from the intracavity reflection mirror and behind the tunable Fabry-Perot filter;
• the first laser cavity mirror, the intracavity reflection mirror and the second laser cavity mirror forms the laser cavity;
• the first laser cavity mirror, the laser gain medium, the intracavity collimating lens, the active optical phase modulator, the tunable acousto-optical filter, the intracavity reflection mirror, the tunable Fabry-Perot filter and the second laser cavity mirror are arranged in such a way that only the first order diffracted beams of the first diffraction and the second diffraction can be oscillated in the laser cavity;
• the laser output beam is in the same optical axis of the first order diffracted beam of the first diffraction.