External cavity wideband tunable laser with dual laser gain media coupled by a thin film filter including

An external cavity wideband tunable laser with dual laser gain media coupled by a thin film filter including:

• a first laser gain medium, a first laser cavity end mirror arranged on the first laser gain medium, a first intracavity collimating lens, an active optical phase modulator, a tunable acousto-optic filter, an intracavity reflection mirror, which are all arranged sequentially, an etalon and a total reflection mirror, which are arranged on the opposite side of the tunable acousto-optic filter from the intracavity reflection mirror, the laser further comprises:
• a second laser gain medium, a second laser cavity end mirror arranged on the second laser gain medium, a second intracavity collimating lens, the optical axes of second laser gain medium and the second intracavity collimating lens being vertical to the optical axes of the first laser gain medium and the first intracavity collimating lens;
• a thin film optical filter with its optical axis arranged with 45 degrees angle with respect to the output light beams of the first intracavity collimating lens and the second intracavity collimating lens respectively to pass the lights beam from the first intracavity collimating lens and to reflect the lights beam from the second intracavity collimating lens;
• a radio frequency signal source for providing radio frequency energy for the tunable acousto-optic filter and for adjusting the oscillation wavelength of the laser resonant cavity by changing RF frequency;
• and
• pumping sources for the two laser gain media, an active optical phase modulator drive source and a laser drive control circuit.