| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Anomalous Variation of Beat Frequency in a Dual Frequency He–Ne Laser |
| Wei-Xin Liu**, Ming-Zhe Sun |
Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209
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| Cite this article: |
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Wei-Xin Liu, Ming-Zhe Sun 2016 Chin. Phys. Lett. 33 024206 |
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Abstract The beat frequency in a dual frequency He–Ne laser varies while the resonant cavity length is tuned. As to the laser with two longitudinal modes, the variation amplitude is commonly less than 500 kHz, proven by experiments and theories. This study reveals an anomalous variation of the beat frequency when a piece of element is put into the cavity and is aligned with the laser axis. Consequently the variation amplitude could reach 22 MHz, several dozen times larger than that without the intra-cavity element. This cannot be explained only by laser mode pulling and pushing effects. Some influencing factors are investigated experimentally, including the tilted angle of the element and the distance between its surface and cavity mirror. The qualitative analysis is discussed, which agrees with the experimental results.
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Received: 23 November 2015
Published: 26 February 2016
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| PACS: |
42.60.Da
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(Resonators, cavities, amplifiers, arrays, and rings)
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42.60.Lh
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(Efficiency, stability, gain, and other operational parameters)
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42.55.Lt
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(Gas lasers including excimer and metal-vapor lasers)
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42.62.Eh
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(Metrological applications; optical frequency synthesizers for precision spectroscopy)
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