Single end-pumped high-power narrow-pulse fundamental mode laser and working method thereof

Abstract

The invention relates to a single end-pumped high-power narrow-pulse fundamental mode ultraviolet laser and a working method thereof. The laser includes a pump source, a coupling lens group, a plano-convex lens, a laser crystal, a Q-switching device, a first flat mirror, a triple frequency crystal, a frequency doubling crystal and a second flat mirror; one end face of the triple frequency crystalis cut into the brewster angle. The laser adopts plano-convex V-cavity design, which increases the internal mold volume of a resonant cavity and the number of inverted particles which can be utilizedin the laser crystal. The design can compensate for the thermal lens effect during high-power operation, so that the laser is in a stable region at high power, the stable running of the laser under the single-ended high power is achieved, and the volume and cavity length of the laser are reduced to facilitate narrow pulse output. The design of a plano-convex cavity is beneficial for suppressing multi-mode generation, the laser has a mode selection function, and the beam quality of fundamental light, frequency doubled light and ultraviolet light of the laser is improved.

Description

technical field [0001] The invention relates to a single-end pumped high-power narrow-pulse fundamental-mode laser and a working method thereof, belonging to the technical field of high-repetition-frequency pulse lasers and nonlinear optical frequency conversion. Background technique [0002] The end-pumped solid-state ultraviolet laser is generally pumped by a semiconductor laser (Laser Diode, LD) to pump Nd:YVO 4 Gain mediums such as crystals output fundamental frequency light, and then frequency doubling is performed by frequency doubling crystals such as LBO, and the remaining fundamental frequency light and frequency doubling light are summed by sum frequency crystals such as LBO to generate triple frequency ultraviolet laser. There are two main ways to convert fundamental frequency light to generate ultraviolet light: extra-cavity frequency conversion and intra-cavity frequency conversion. Extracavity frequency conversion uses a focusing system to focus fundamental fr...

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Problems solved by technology

[0008] The above-mentioned patents all have the following defects: 1. There are three resonant cavity arms, which increases the length of the resonant cavity, increases the pulse width of the fundamental frequency light, and reduces its peak power and conversion efficiency of frequency doubling and triple frequency

2. There are many components in the resonant cavity, which increases the loss in the laser cavity. At the same time, multiple components increase the possibility of damage to the surface film of the component, which greatly reduces the service life of the laser.

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