2[Mu]m high-energy single frequency pulsed laser based on optical fiber solid cascade amplification

Abstract

The present invention provides a 2[Mu]m high-energy single frequency pulsed laser based on optical fiber solid cascade amplification. A low-power continuous single frequency seed resource is taken asa front end, the continuous single frequency seed resource is chopped to pulse light through adoption of an acoustic optical modulator, and the pulse repetition rate, pulse width and waveforms after chopping are flexibly controlled through control of the drive repetition rate, pulse width and waveforms of the acoustic optical modulator. A polarization maintaining optical fibre amplifier and a solid-state amplifier are employed to achieve energy amplification of the single-frequency pulse laser to finally achieve 2[Mu]m high-energy single frequency pulsed laser output. The low-power continuoussingle frequency seed resource is stable and reliable in single frequency performance, and high in capacity of resisting disturbance; the polarization maintaining optical fibre amplifier is employed at a preceding stage to effectively improve the small signal amplification capacity; and solid amplification is employed at a backward stage to easily generate single-frequency pulse laser output of high-pulse energy and high-peak power. The laser is simple in structure, stable in system and adjustable in parameter, can be suitable for a general working environmental requirement, and can be suitable for airborne and satellite-borne requirements.

Description

technical field [0001] The invention belongs to the field of 2μm lasers, in particular to a 2μm high-energy single-frequency pulse laser based on optical fiber solid-state cascade amplification. Background technique [0002] 2μm lasers are widely used in atmospheric and environmental monitoring, laser medical treatment, laser precision ranging, photoelectric countermeasures, laser radar and other fields. In the field of laser radar for Doppler wind measurement or remote sensing to detect atmospheric concentration, 2μm laser is used as its emission source, and its line width, frequency stability, single pulse energy, beam quality and other parameters directly determine the measurement accuracy and detection ability of laser radar. Therefore, the development of a narrow-linewidth, high-energy, and high-performance 2μm single-frequency pulsed laser is of great significance for improving the measurement accuracy, temporal and spatial resolution, and stability of the lidar system...

AI Technical Summary

Problems solved by technology

[0004] One is that the frequency stability of the laser pulse is determined by the frequency stability of the longitudinal mode of the driven cavity, and since the frequency of the longitudinal mode of the driven cavity has a random jitter relative to the frequency of the seed light, its frequency stability is compared to that of the The frequency stability of the seed light is poor;

[0005] The second is that the seed injection laser needs to achieve narrow linewidth output, and the required pulse width is relatively wide. The corresponding requirement is that the cavity length of the resonator is relatively long, resulting in complex structure and poor stability of the laser.

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