Device for improving rotary table chopper Q-switch laser performance and a Q-switch laser

Abstract

The invention discloses a device for improving rotary table chopper Q-switch laser performance and a Q-switch laser. The device comprises Galileo telescope units located inside or outside a resonant cavity and a rotary table chopper Q-switched component located inside the resonant cavity and used for performing Q-switch on a compressed laser beam; when the number of laser media is one, the first Galileo telescopic unit is located inside the resonant cavity and used for compressing the diameter of the compressed laser beam so as to reduce Q-switching time and enhance Q-switch effect; when the number of the laser media is more than one, the second Galileo telescopic unit located outside the resonant cavity is shared by various laser resonant cavities and used for subjecting the Q-switch laser to beam combination, and superposition output of incoherent light wave is realized; when the number of the laser media is more than one which is an even number, superposition output of quasi-coherent light wave is realized by the aid of a polyhedron prism and the third Galileo telescopic unit located in the laser resonant cavity. The device is of active effects on narrow pulse width and large-energy Q-switch laser generated by the aid of a shopper rotary table.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a device and a Q-switched laser for improving the chopping Q-switching performance of a laser turntable. Background technique [0002] Laser Q-switching is one of the main technical methods to generate narrow pulse and high peak power laser. Compared with electro-optic, acousto-optic and passive Q-switching methods, rotary-disk chopper Q-switching has the advantages of good turn-off effect, simple structure, no additional absorption loss and useless loss, no wavelength and polarization selectivity, and high power tolerance. [0003] In 1996, Chin-Lin Chen indicated in the book "Elements Of Optoelectronics And Fiber Optics" that the Q-switching method of the laser mechanical chopper (Rotation Chopper) refers to inserting a rotating chopper in the laser cavity, chopping The wave turntable is driven by a high-speed motor, and there are several slits or small holes on its edge. When ...

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Problems solved by technology

However, this method has a defect in the implementation of turntable chopper Q-switching for lasers with large aperture, high energy, and fast laser build-up time: if the diameter of the through-hole is larger than the diameter of the laser medium (usually selected), it will cause the opening time of the Q switch If the diameter of the optical hole is smaller than the diameter of the laser medium, although the opening time of the Q switch can be reduced, it will increase the useless loss of laser power and reduce the laser oscillation. The mode volume of the laser medium cannot be fully utilized

Although these two methods can reduce the diameter of the optical hole of the chopper turntable and shorten the switching time of the Q switch under the condition of constant motor speed, the following problems still exist in practical applications: The focus has a serious impact on the chopping of the turntable, especially in the case of high power, the light intensity in the cavity is too strong, it is easy to produce the phenomenon of optical frequency breakdown, destroy the laser oscillation condition, cause the laser to have no output, and in serious cases, it will damage the optical components or chopping. Wave turntable

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