Laser device and method for generating adjustable train pulses by multiple times of Q-switching by square wave pump

Abstract

The invention discloses a laser device and method for generating adjustable series pulse by square wave pumping to adjust Q for multiple times, relating to the technical field of laser. The device comprises a Q adjusting unit, and a total reflection mirror, a Q adjusting crystal, a quarter-wave plate, a polaroid, a pumping device and an output mirror which are coaxially and sequentially arranged in the laser beam transmission direction of the device. The method comprises the following steps: enabling a pumping source to start working, and accumulating high energy level electrons, wherein laser pulse output does not occur; when the accumulation of the high energy level electrons reaches a preset value, starting to apply voltage on the Q adjusting crystal, forming laser oscillation in a resonant cavity, and enabling the accumulated high energy level electrons to transit to a low energy level and release photons, thus outputting a first laser pulse; by starting from the output of the first laser pulse, outputting one laser pulse at every time interval t to form a laser pulse string until the pumping source stops working. By adopting the laser device and method, adjustable series pulse laser is generated by using long pulse square wave pumping to adjust Q for multiple times, and output parameter change of a laser and damage to optical devices of the laser are avoided.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a laser device and method for generating adjustable series pulses by multiple times of Q-switching by square wave pumping. Background technique [0002] Laser train pulses containing a certain number of laser pulses are widely used in the fields of plasma diagnosis and pulsed laser illumination. These two applications require laser pulse intervals to be adjustable between 100 microseconds and 300 microseconds However, currently used lasers use a one-to-one correspondence between pump pulses and Q-switched pulses to generate laser train pulses. This method has a defect: if the number of pulses and pulse intervals in the laser train pulses are adjusted, the It will change the output parameters of the laser, and even cause damage to the internal optical components of the laser. Contents of the invention [0003] The object of the present invention is to provide a laser device and ...

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Problems solved by technology

[0003] The object of the present invention is to provide a laser device and method for generating adjustable string pulses by multiple Q-switching by square wave pumping, so as to solve the aforementioned problems existing in the prior art

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