Modulation techniques for lasers
An arrangement for frequency modulating a laser beam utilizes an optical prism which is disposed within the laser cavity such that the beam continuously experiences total internal reflection from one face thereof as an optical element having an index of refraction which is less than that of the prism is displaced so as to come in contact with this face and/or move variable distances therefrom. The external optical path of the beam, which exists beyond this face during total internal reflection is, thus, changed. This corresponds to an effective change in the dimensions of the laser cavity and an appropriate shift in the frequency of the laser output beam. Amplitude modulation of the beam can also be achieved by placing the above components outside of the cavity and changing the direction of polarization of the beam entering the optical prism. 9 claims, 3 drawing figures.
- Assignee:
- TIC; ERA-01-017016; EDB-76-042950
- Patent Number(s):
- US 3940712
- OSTI ID:
- 7365334
- Resource Relation:
- Patent File Date: Filed date 11 Apr 1974
- Country of Publication:
- United States
- Language:
- English
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Optical device with conical input and output prism faces
Optical device with conical input and output prism faces