Intensity tuning characteristics of double-mode He--Ne laser with optical feedback |
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| Authors: | Mao Wei Zhang Shu-Lian Fei Li-Gang |
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| Affiliation: | The State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University,Beijing 100084, China |
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| Abstract: | This paper investigates the intensity tuning characteristics of a doublelongitudinal modes He--Ne laser subjected to optical feedback. The intensityundulations of the total light and the two modes are observed for different externalcavity length. Two modulations of the internal cavity length are performed. One isonly for the internal cavity length being modulated and the other is for both theinternal and the external cavity length being modulated. The undulation frequency ofthe total light is found to be determined by the ratio of external cavity length tointernal cavity length in both modulations. When the external cavity length isintegral times of the internal cavity length, the fringe frequency of the totallight could be seven or even more times of that in conventional optical feedback. Asimple theoretical analysis is presented, which is in good agreement with theexperimental results. The potential use of the experimental results is alsodiscussed. |
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| Keywords: | tuning characteristics optical feedback double longitudinal modes |
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