1 April 2001 Mode suppression, its elimination, and generation of small frequency differences in birefringence He-Ne lasers
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Optical Engineering, 40(4), (2001). doi:10.1117/1.1355255
Abstract
The birefringence He-Ne dual-frequency laser (DFL) has so far provided only frequency differences (FDs) larger than 40 MHz, as a result of mode suppression (competition) between the two frequencies. This paper reports experiments on mode suppression in cavity tuning and demonstrates an approach to eliminate this suppression in order to generate small FD ranging from 3 MHz to hundreds of megahertz in birefringence He-Ne DFLs. This is realized with two intracavity elements: a calcite plate and a quartz crystal plate. The calcite plate is used to separate the paths of o light and e light spatially, in parallel, in the laser core of about 1-mm diam, so that light of each polarization acquires gain from its own group of active atoms without mode suppression. Also, the quartz plate is used to precisely tune the magnitude of the FD. This work has filled in the gap of FD between 3 and 40 MHz, which neither traditional Zeeman nor birefringence He-Ne DFLs can supply.
Shulian Zhang, Yuye Jin, Jie Fu, Yan Li, Shiqun Li, Jiaqiang Li, "Mode suppression, its elimination, and generation of small frequency differences in birefringence He-Ne lasers," Optical Engineering 40(4), (1 April 2001). http://dx.doi.org/10.1117/1.1355255
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KEYWORDS
Birefringence

Quartz

Helium neon lasers

Crystals

Calcite

Interferometers

Ferroelectric materials

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