Dual-wavelength alternately Q-switched single longitudinal mode output group pulse laser and laser output method

Abstract

The invention discloses a dual-wavelength alternate Q-switched single longitudinal mode output group pulse laser and a laser output method. The laser includes: a second pump source, a second optical fiber, a second coupling lens group, a second laser total reflection mirror, The first laser total reflection mirror, the first coupling lens group, the first optical fiber, the first pump source, the first laser gain medium, the second laser gain medium, the first polarizer, the quarter wave plate, the second starting Polarizer, first 45° reflector, second 45° reflector, electro-optic Q-switched crystal and laser output mirror. The present invention can obtain dual-wavelength single-longitudinal-mode laser with a wide wavelength range and a relatively large difference between wavelengths, presents a dual-wavelength group pulse alternating state on the output pulse sequence, and the type of laser gain medium is not limited.

Description

technical field [0001] The invention relates to the field of solid-state lasers, in particular to a dual-wavelength alternate Q-switched single longitudinal mode output group pulse laser and a laser output method. Background technique [0002] High repetition rate dual-wavelength lasers have been widely used in long-range laser ranging, laser medical treatment, photoelectric countermeasures, laser communication, laser radar and other fields. When the dual-wavelength pulsed laser is a single longitudinal mode laser, the research accuracy can be further improved in the above research fields. If the pulse group is used for single longitudinal mode laser communication and distance measurement, it has strong confidentiality and anti-interference. Existing common Q-switched dual-wavelength pulsed lasers output at the same time, and there is a fixed time interval between each pulse; secondly, most dual-wavelength lasers use a single laser gain medium to obtain simultaneous output ...

AI Technical Summary

Problems solved by technology

However, the known technology has the following deficiencies in the following five aspects: First, when operating under the condition of large injection and high repetition rate, due to the use of a single gain medium, the thermal burden of itself is too heavy, which will bring about a very serious thermal lens effect, thereby reducing the The beam quality also limits the output energy of a single pulse; second, the obtained group pulse sequence has a single wavelength, and the application range is small; third, the pulse sequence is obtained by a pulse sequence control device, and the system is bulky; fourth, the Pockels cell phase modulation is used , needs to be driven by a supporting power supply, and the structure is complex; Fifth, it is worth pointing out that the output dual-wavelength laser is not a single longitudinal mode laser

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