Control of laser frequencies using a Fabry-Perot interferometer and DAC techniques

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Abstract
A digital-to-analogue converter circuit to be used in combination with a scanning Fabry-Perot apparatus has been designed in order to measure laser frequencies. The device has been tested with the 633 nm He Ne laser line. Mode frequency separations starting from about 10 MHz and extending to approximately 1 GHz have been measured with an accuracy of 1 MHz. In combination with a thermally frequency stabilised two-mode He Ne laser, the circuit has also been utilised to stabilise the FP interferometer and the FP sweep electronics to eliminate inaccuracy due to thermal drift.