Er:YAG tunable single-longitudinal-mode laser with twisted mode cavity

Abstract

The invention relates to a single-longitudinal-mode solid laser transmitter, in particular to an Er:YAG tunable single-longitudinal-mode laser with a twisted mode cavity. Two quarter-wave plates are adopted; spatial hole burning of the Er:YAG laser is eliminated by the use of a twisted mode technology; a left-handed circularly-polarized beam and a right-handed circularly-polarized beam meet in the Er:YAG crystal, and the two beams have a Pi / 4 phase difference, leading to uniform energy distribution in the Er:YAG crystal; accordingly, the effect of spatial hole burning of the laser is eliminated, and single longitudinal mode laser outputting is finally achieved for the Er:YAG laser. The loss of a resonant cavity of the laser is changed by changing the angle of a wavelength tuning element, and tuning of the Er:YAG single-longitudinal-mode laser is achieved. The Er:YAG tunable single-longitudinal-mode laser with the twisted mode cavity can be used as a single-longitudinal-mode laser.

Description

technical field [0001] The invention relates to a single longitudinal mode solid-state laser emitting device. Background technique [0002] Due to the characteristics of good coherence, narrow linewidth and stable frequency, single longitudinal mode lasers are widely used in optical frequency standards, fine spectrum measurement, coherent communication, laser radar and other fields. The 1.6μm laser is located in the human eye safety band, in the atmospheric transmission window, and has the characteristics of stable performance under different atmospheric conditions. Therefore, the 1.6μm band single longitudinal mode laser has shown more and more widespread applications in military, medical, scientific research and many other fields. Application prospect. At present, with Er-doped laser crystal as the working medium, the 1.6 μm single longitudinal mode laser output of the single Er-doped laser is realized by using the short cavity method, the F-P etalon method, and the non-p...

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Problems solved by technology

Among them, the short-cavity method has a simple structure, good structural stability, and is the easiest to obtain a single longitudinal mode output, but the length of the laser working medium is short, and the gain of the laser is limited, which greatly limits the single longitudinal mode output power of the laser. At the same time, Its beam directivity is poor, and a wide range of wavelength tuning cannot be achieved; although the non-planar ring cavity can obtain stable high-power single longitudinal mode laser output, its structural design is complicated, and because this structure requires the working substance to have a magnetic The optical effect characteristics limit the application range of the non-planar ring cavity; the structure of the F-P etalon method is relatively simple and has a certain tuning range, but the stability of the output single longitudinal mode laser is greatly affected by the F-P etalon, and the adjustment is relatively Difficulty, which leads to its poor stability. In addition, the laser gain medium of the F-P etalon single longitudinal mode laser is short, which also limits its single longitudinal mode laser output power to a certain extent.

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