Single-frequency laser with human eye safety wave band linear polarization

Abstract

The invention discloses a single-frequency laser with human eye safety wave band linear polarization. The laser mainly uses a gain optical fiber to amplify, the structure of the laser comprises a seed source laser, a seed isolator, a beam splitter and a Raman optical fiber amplifier, seed light output from the seed source laser passes through the seed isolator and then enters the beam splitter, a part of seed light is split by the beam splitter and is used as local oscillation light in coherent detection, the remaining seed light is amplified by the Raman optical fiber amplifier, and higher-energy single-frequency pulse laser output is acquired. The single-frequency laser has the characteristics of simplicity in structure, small size, high stability and the like, and the laser amplified by the single-frequency laser has the same spectral feature as a pumping source of the Raman optical fiber amplifier and the same pulse performance as the seed light. By the single-frequency laser, a parameter of the pumping source of the Raman optical fiber amplifier can be adjusted according to actual demand, and single-frequency pulse laser, of which laser repetition frequency and pulse width can be tuned, in a human eye safety wave band is acquired.

Description

technical field [0001] The invention belongs to the technical field of eye-safe band lasers, and relates to a radiation source applied to a coherent laser radar, in particular, to a single-frequency laser with linear polarization in a human eye-safe band. Background technique [0002] Single-frequency lasers in the eye-safe band have important application prospects in the fields of remote sensing technology, coherent lidar detection and coherent optical communication. In these fields, the laser linewidth is often required to be below 10 MHz. The way to achieve single-frequency laser in the eye-safe band mainly includes solid-state lasers, fiber lasers and optical parametric oscillators. Among them, the seed-injected 1.6μm band erbium-doped solid-state laser and the optical parametric oscillator can obtain high pulse laser energy. However, the repetition frequency of the laser is low, and the line width is tens of MHz or even hundreds of MHz. Especially, the control system ...

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Problems solved by technology

However, the repetition frequency of the laser is low, and the line width is tens of MHz or even hundreds of MHz. Especially, the control system of seed injection into the resonator is complicated, which reduces the stability of the system.

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