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Study Of LD-Pumped Intracavity Frequency-Doubled Dual-Frequency Solid-State Laser Technique

Posted on:2007-11-12Degree:MasterType:Thesis
Country:ChinaCandidate:Y Y ZhaoFull Text:PDF
GTID:2178360182473570Subject:Measuring and Testing Technology and Instruments
Abstract/Summary:PDF Full Text Request
Dual-frequency laser has been used extensively in many fields such as optical interferometry and optical sensing, etc. When dual-frequency laser is used as light source, synthetic wavelength is required as small as possible in the absolute-distance interferometry measurement in order to improve measurement accuracy, namely, it requires the frequency-difference as large as possible. Compared with gas lasers, LD-pumped solid-state lasers (DPSSL) have broad gain bandwidth and have been investigated extensively in the reaserch of large frequency-differenc dual-frequency laser. As for the certain frequency-differenc of dual-frequency laser, using frequency doubling technique, the frequency-differenc of dual-frequency laser can be doubled. As a result, investigating the LD-pumped intracavity frequency-doubled dual-frequency solid-state laser technique is of great significance.The thesis includes three parts as follows. First, by using the rate equation theory of four-energy-level system, operating characteristics of DPSSL are analysed, and the makeup and the design principle of DPSSL are introduced, besides, experimental investigations of LD end-pumped Nd:YAG and Nd:YVO4 laser techniques have been carried out. Second, on the basis of analyzing the technique of selecting single longitudinal mode by birefringent filter, a scheme of LD end-pumped dual-frequency Nd:YAG laser is proposed, namely, a piece of PBS inserted into standing-wave cavity of LD end-pumped Nd:YAG laser and a frequency-doubling crystal KTP constitute the new type of birefringent filter to realize single mode operation. Simultaneously, p and s components of 1064nm fundamental radiation can be oscillated in single mode in two standing-wave cavities, respectively. Two polarization modes of 532nm green laser can be obtained through KTP intracavity frequency-doubled crystal. The output of dual-frequency green laser can be obtained by utilizing the other piece of PBS; feasibility analysis and preliminary experimental investigations of the proposed scheme have been carried out, and the simultaneous outputs of the green laser at 532nm wavelength in the two cavities have been achieved.Third, based on analyzing the advantages and the disadvantages of the proposed scheme, an improved scheme of using Nd:YVO4 crystal instead of Nd:YAG crystal is proposed, and feasibility analysis and preliminary experimental investigations have been carried out for the improved scheme,theoretical analysis indicates that in order to make p and s components oscillated simultaneously at the same power approximately, it is required that the angle between the polarization orientation of PBS and the polarization direction of fundamental radiation is 45°so as to realize the output of dual-frequency laser; the obvious effect of PBS-KTP in selecting single mode has been observed experimentally.
Keywords/Search Tags:LD-pumped, solid-state laser, dual-frequency laser, birefringent filter, PBS
PDF Full Text Request
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