End and side mixed pumping Tm laser

Abstract

The invention discloses an end and side mixed pumping Tm laser, and relates to a laser, in particular to an end and side mixed pumping Tm<3+>:YLF laser. Pumping light of 792 nm is split into two beams to the side of a crystal from the end by using two 45-degree beam splitters; a 45-degree 792 nm membrane series totally reflecting mirror is adopted to turn a light path of the side pumping light; a pumping spot is reduced through a beam shrinkage mirror to perform pumping on the side of the crystal; and thus, a structure for pumping the end and the side simultaneously by an LD (Laser Diode) is formed. In design of the entire machine, focusing is completely avoided, the cavity length is reduced, and the threshold is favorably reduced. The method is complete and accurate, is suitable for the technical research of Tm<3+>:YLF laser pumping and is applied to the fields such as electro-optical countermeasure, laser radar and laser medical treatment.

Description

technical field [0001] The invention relates to a Tm laser with end-side hybrid pumping, in particular to a Tm laser with end-side hybrid pumping 3+ : YLF laser. Applicable to Tm 3+ : YLF laser pumping technology research, application fields include photoelectric countermeasures, laser radar and laser medical treatment and other fields. Background technique [0002] T m 3+ : YLF lasers are widely used in various fields such as photoelectric countermeasures, laser radar and laser medical treatment. The 2μm wavelength is not only safe for human eyes, but also has low atmospheric transmission loss, and because of its large absorption and small reflection by green vegetation and moist soil, it is beneficial to distinguish ground targets from backgrounds in laser detection. Near-mid-infrared tunable laser is an ideal source of photoelectric anti-interference. Continuous high-power laser output in the 2μm band is the basis for obtaining optical parametric oscillation (OPO) out...

AI Technical Summary

Problems solved by technology

The thermal effect caused by the uneven temperature distribution in the laser crystal will reduce the beam quality, and then affect the output characteristics of 2 μm or even 3 ~ 5 μm

[0003] Scholars at home and abroad have done a lot of theoretical and experimental work on Tm:YLF laser pumping technology, mainly focusing on Tm:YLF laser single-ended pumping, single-LD double-ended pumping and dual-LD double-ended pumping, using single-ended pumping The laser with pumping technology has simple structure, convenient adjustment, high stability and low cost, but single-ended pumping makes the temperature distribution in the laser crystal uneven, the beam quality is not high, and the light-to-light conversion efficiency is low due to reabsorption; The dual LD ​​double-ended pumping makes the temperature distribution in the crystal more uniform, but it is very easy to cause focusing phenomenon, which is easy to cause damage to the optical fiber and crystal; single LD double-ended pumping reduces the possibility of focusing, but it cannot be completely avoided. focus happens

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