Non-resonant subnanosecond pulse laser

Abstract

The invention relates to the technical field of lasers, and provides a non-resonant subnanosecond pulse laser. The laser comprises a voltage-decreased Q modulating module, a pumping source as well asa pumping coupling unit, a dichroic mirror, a laser gain medium, a Q switch and a reflecting mirror which are arranged along the direction of a transmitting light path of the pumping source in sequence; the pumping coupling unit is used for focusing pumping light transmitted by the pumping source onto the laser gain medium through the dichroic mirror, the dichroic mirror is arranged slantly, and ahigh transparency film is coated at the end, facing the dichroic mirror, of the laser gain medium; and the voltage-decreased Q modulating module is electrically connected with the Q switch. The hightransparency film is coated at the end, facing the dichroic mirror, of the laser gain medium, the pumping coupling unit is used for being focused onto the high transparency film completely after passing through the dichroic mirror, laser light can be output inside the cavity through once transition, the pulse width is effectively controlled, and the single pulse energy is further improved. Moreover, due to the fact that the voltage-decreased Q modulating module is adopted in the laser, a 1 / 4 wave plate does not need to be arranged.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a non-resonant subnanosecond pulse laser. Background technique [0002] With the rapid development of laser technology, laser technology plays an increasingly important role in various fields, from military to civilian, from scientific research to teaching, from industry to agricultural and sideline industries and many other fields. In engineering applications, some materials that are sensitive to processing heat have higher requirements on the pulse width of the laser. Experiments have proved that lasers with a pulse width in the sub-nanosecond range have higher efficiency in processing. For example, when blackening the surface of anodized aluminum, using a laser with a pulse width between 500 ps and 1 ns is more efficient than using a laser with a pulse width between 5 ns and 10 ns. The blackness of the laser is increased by 20-30%, and at the same time, the processing speed is...

AI Technical Summary

Problems solved by technology

Among them, the clipping method requires the switch to be turned on in a very short time, so this kind of laser has high requirements on the circuit and poor stability; and the saturable absorber passive mode-locking method uses chips such as Cr:YAG and GaAs as the saturable absorber. Therefore, the stability of the laser is poor and the repetition rate cannot be controlled; the microchip laser method uses a very short cavity length to compress the pulse width, so it is difficult to obtain a higher single pulse energy

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