Abstract
The operation and performance characteristics of a frequency stabilised carbon dioxide waveguide laser which has been designed to provide a compact, rugged and stable source of infrared radiation suitable for the non-laboratory environment is described. The laser produces a maximum output power of 4.75 W in the EH11 waveguide mode and is actively stabilised on the P(20) rotational-vibrational transition by means of an extra-cavity frequency reference provided by a Stark-effect-tunable resonance absorption in singly deuterated ammonia. Short-term (1 ms) stability of the output is about 5 kHz, and in the long term, the laser can be held to within 1 MHz for periods of many hours at a frequency which itself is voltage controllable over a range of about 200 MHz.
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