Method for controlling cavity length of seed injection laser driven cavity and its laser

Abstract

The invention provides a laser device and a method for controlling the length of a driven cavity of a seed injection laser. The control method is described as following: the back cavity mirror is adhibited to a piezoelectric ceramics, and a piezoelectric ceramics driving circuit applies a linear scanning voltage on the piezoelectric ceramics during each pumping pulse, and turns on a Q switch when the seed light transits the driven cavity thereby forming interference signal peak, and then emits single longitudinal mode Q-switched laser, meanwhile, a sequential control system executes feedback control to the delay time of scanning voltage initial time relative to pumping pulse initial time as soon as pulse finishing, so that each moment of turning on the Q switch is at the position same with that of the pumping pulse trailing edge. The probability that the invention can emit single longitudinal mode pulse is close to 100%, so that the energy stabilization between pulses can be greatly improved.

Description

technical field [0001] The invention relates to a single-frequency laser, which is a method for controlling the cavity length of a driven cavity of a seed-injected laser and a laser thereof. A single-longitudinal-mode Q-switched laser with stable energy between pulses is realized by dynamically adjusting the cavity length of the driven cavity of the seed-injected laser. output. Background technique [0002] Single longitudinal mode Q-switched lasers have broad application prospects in lidar, nonlinear optics and other fields. At present, the method of seed injection is usually used to realize high average power single longitudinal mode Q-switched laser. The seed injection scheme injects low-power continuous seed light with excellent frequency performance into the driven cavity. When the frequency of the seed light matches the frequency of the longitudinal mode of the driven cavity, a single longitudinal mode Q-switched laser can be output. To successfully achieve seed inje...

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Problems solved by technology

[0003] The establishment time minimization scheme performs feedback adjustment on the cavity length after each light output, so that the establishment time of the Q-switched pulse is the shortest. This scheme has lower requirements on the device and can ensure the energy stability of the output pulse, but the anti-interference ability is poor. For laboratory use only

The resonance detection scheme scans the cavity length during each pump pulse, and turns on the Q-switching switch when scanning to a suitable position. This scheme can achieve nearly 100% single longitudinal mode output and has strong anti-interference ability, but due to The time to scan to a suitable position is uncertain, and the corresponding pump pulse width is different each time the Q-switching switch is turned on, which makes the energy jitter between pulses larger

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