Frequency stabilized laser
Arrangements are disclosed for the frequency stabilization of a laser using an external gas cell providing an absorption resonance which is controllably tuned by means of the linear Stark effect. An error signal, which locks the laser to the desired oscillation frequency, is generated either by dither modulation of the Stark-effect cell voltage or by differential absorption in a pair of Stark-effect cells having their absorption resonances stagger tuned about the desired laser oscillation frequency. The disclosed arrangements are especially suited to stabilization of a waveguide CO$sub 2$ laser operating on the P(20) 10.6 $mu$ laser transition. Advantages are the ability to stabilize the laser at any frequency within the laser tuning range and the elimination of undesired frequency modulation on the generated laser beam. (auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-33-020102
- Assignee:
- to Hughes Aircraft Co.
- Patent Number(s):
- US 3921099
- OSTI ID:
- 4091056
- Country of Publication:
- United States
- Language:
- English
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