Patent ID: 8923351

Claim:
A device for producing amplitude-modulated radiation at a very high frequency, from a beat frequency of two laser beams emitting different light frequencies, the device comprising: a resonant optical cavity having very stable dimensions receiving the two laser beams, said resonant cavity having at least two different resonance frequencies; for each laser beam, a respective interrogation device of the resonant cavity capable of supplying an electrical signal representing the difference in frequency between the light frequency of the beam and a resonance frequency of the resonant cavity, and servo control means for separately controlling the light frequency of each of the laser beams according to the frequency difference observed, wherein the laser beams have orthogonal polarizations, and the servo control means comprise a polarization splitter for the separate servo control of the beams according to their polarization, and a polarizer is placed at the output of the device on the path of the two superposed beams for producing a radiation beam for producing an electromagnetic beam combining the two polarizations and amplitude-modulated at the beat frequency.