Bistable Tm,Ho:YLE laser with bistable zone and adjustable width -

Abstract

The invention provides an optical bistable Tm, Ho:YLF laser, the width of pumping bistable area of a laser diode end surface of which can be adjusted; the optical bistable Tm, Ho:YLF laser comprises a laser diode pumping source, an optical fiber, a coupling lens, a resonant cavity and a thulium and holmium codoping lithium yttrium fluoride crystal; the optical bistable Tm, Ho:YLF laser is characterized in that: pumping light given off by the two laser diode pumping sources enters in the resonant cavity by respectively passing through the optical fiber and the coupling lens; the resonant cavity is an L-shaped right-angle folding cavity which is composed of a back-cavity mirror, a 45 degrees plane folding mirror and an output mirror; the front end of the resonant cavity is the back-cavity mirror, the rear end thereof is the 45 degrees plane folding mirror, and the lower end thereof is the output mirror; the thulium and holmium codoping lithium yttrium fluoride crystal is arranged in the resonant cavity. The laser has small volume, simple structure and low cost; by injecting pumping light to an absorption area, the absorption performance of the absorption area is changed, thus achieving the purpose of adjusting the width of the bistable area and leading the laser to have large adjusting magnitude and convenient usage.

Description

(1) Technical field [0001] The invention relates to a device in the field of laser technology, in particular to an optical bistable Tm, Ho:YLF laser with an adjustable width of a laser diode end-pumped bistable region. (2) Background technology [0002] Optical bistability is a new nonlinear optical phenomenon discovered 15 years after the creation of laser light. Laser bistability refers to two stable output powers corresponding to the same pump power, which output power depends on the way the pump power reaches the corresponding point (whether it increases to this value or decreases to this value). Laser optical bistability has important applications in the fields of optical logic devices, optical switches, optical communications, and optical storage. The method of generating laser bistability is generally to add a dispersive medium or a saturable absorber in addition to the gain medium in the laser resonator, resulting in a complex structure of the laser, and it is diffi...

AI Technical Summary

Problems solved by technology

Due to the reabsorption of the ground state in the non-population inversion region of the laser crystal (the absorption region for 2 μm photons), the laser is in a high-loss state. Therefore, with the increase of the pump power, the particle number density of the energy level on the laser crystal increases with The increase of , leading to more significant influence of energy transfer up-conversion and excited state absorption effect, so that the threshold of pump power is further increased

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