Abstract
We have developed a gain-switched room temperature single axial mode LiF:F 2 − laser using a coupled narrowband resonator. The resonator uses a classic four-prism achromatic beam expander/Littrow grating configuration, augmented with a dichroic mirror that defines a coupled resonator with: (1) reduced threshold and higher efficiency, and (2) dramatically increased axial mode separation for enhanced mode selectivity. One étalon was then sufficient to achieve single axial mode output with <100 MHz bandwidth and an energy conversion efficiency of 5.5%, significantly higher than previously reported for narrowband LiF:F 2 − lasers where only a bandwidth of 300 MHz had been achieved. The single longitudinal mode laser was tunable in single mode between 1120 and 1200 nm. A coupled cavity model was developed to explain the experimentally observed mode structure, and to allow similar coupled resonators to be optimised for other vibronic laser media.
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