Dual frequency laser

Details Dual frequency laser Dual frequency laser

1980-10-08

1983-08-02

Sikes, William L.

Coherent light generators

Having an applied magnetic field

372 28, 372 29, 372 20, 372 22, H01S 313

Patent

active

043970257

ABSTRACT:
A method and apparatus for operating a dual-frequency gas laser so as to controllably switch between frequencies makes use of a cavity so tuned that the comb of resonant frequencies is not commensurate with the frequency difference between the laser operating frequencies, and, in a preferred embodiment, with one of the resonant frequencies tuned to coincide with one of the operating frequencies. The cavity length and overall gain at each frequency are so selected that the spacing between resonant frequencies is greater than the breadth above unity gain of the individual peaks of the gain vs. frequency curve. The active material is subjected to a magnetic field which may be varied in a controlled manner. In a preferred embodiment, this field is applied normal to the optical axis of the resonant cavity, and an optical element within the cavity is arranged to act as a plane polarizer with its plane of polarization normal to the magnetic field.

REFERENCES:
patent: 3464024 (1969-08-01), Bell et al.

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