Preventing output power rise and fall in an extra-shortened He-Ne laser by equal-spacing mode split technology

Yanmei Han; Shulian Zhang; Kelan Li

doi:10.1117/1.600772

1 July 1996 Preventing output power rise and fall in an extra-shortened He-Ne laser by equal-spacing mode split technology

Yanmei Han, Shulian Zhang, Kelan Li

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Optical Engineering, Vol. 35, Issue 7, (July 1996). https://doi.org/10.1117/1.600772

An extra-shortened He-Ne laser (shorter than 100 mm) does not work well because there is likely no longitudinal mode in the lasing bandwidth at some times and the output power rises and falls deeply from time to time. A method to solve this problem is presented and investigated. A piece of appropriately designed quartz crystal plate is used as a cavity mirror of a He-Ne laser, which has a larger longitudinal mode spacing than the lasing bandwidth to achieve an equal-spacing mode split. In other words, the number of longitudinal modes is doubled and the actual mode spacing is reduced to half of that without mode split. Therefore, there is always at least one mode operating in the lasing bandwidth and the power is stable at any room temperature. Such a laser with 85-mm cavity length and 0.24-mW output power is constructed.

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Yanmei Han, Shulian Zhang, and Kelan Li "Preventing output power rise and fall in an extra-shortened He-Ne laser by equal-spacing mode split technology," Optical Engineering 35(7), (1 July 1996). https://doi.org/10.1117/1.600772

Published: 1 July 1996

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