Thulium and dysprosium co-doped bromide mid-infrared laser crystal as well as preparation method and application thereof

Abstract

The invention discloses a thulium-dysprosium co-doped low-phonon energy bromide laser crystal for a 4-5 micron all-solid-state laser and a preparation method of the thulium-dysprosium co-doped low-phonon energy bromide laser crystal, and relates to the field of mid-infrared laser materials and devices. The molecular formula of the crystal is M (TmxDyyPb1-x-y) 2Br5, M is metal elements K, Rb and Tl, x is larger than or equal to 0.01 and smaller than or equal to 0.1, and y is larger than or equal to 0.001 and smaller than or equal to 0.05. In the laser crystal, thulium ions serve as sensitized ions, absorb energy of a near-infrared band commercial semiconductor laser and transmit the energy to dysprosium ions. The dysprosium ions are used as active ions, and efficient laser output of the wave band of 4-5 microns is obtained through transition from Dy < 3 + >: 6H11 / 2 to 6H13 / 2. The M (TmxDyyPb1-x-y) 2Br5 crystal with low phonon energy has excellent laser characteristics, can be directly pumped through a commercial LD, and can promote the miniaturization development of a dysprosium-activated intermediate infrared laser.

Description

technical field [0001] The invention relates to the field of laser materials, in particular to a class of thulium-dysprosium co-doped bromide laser crystals with low phonon energy for 4-5 micron all-solid-state lasers and a preparation method thereof. The molecular formula of the thulium-dysprosium co-doped bromide laser crystals is M ( Tm x Dy y Pb 1-x-y ) 2 Br 5 , where M is the metal element K, Rb, Tl, the value range of x is: 0.01≤x≤0.1, and the value range of y is: 0.001≤y≤0.05. Background technique [0002] The 4-5 micron laser is located in the atmospheric window and corresponds to the vibrational absorption lines of various molecules. It is widely used in the fields of photoelectric countermeasures, laser medical treatment, environmental monitoring and nonlinear spectroscopy. The main ways to generate the mid-infrared laser in this band are: (1) through the frequency doubling and frequency difference output of the carbon dioxide laser, the working material of th...

AI Technical Summary

Problems solved by technology

However, the mid-infrared laser source in this system is limited by the following two bottlenecks: (1) Dy 3+ Ionic 6 h 11 / 2 → 6 h 13 / 2 The transition lacks a suitable diode laser (LD) pump source and requires 1.3 micron Nd 3+ Laser or 1.7 micron Er 3+ Laser pumping, complex system and poor stability; (2) The lifetime of the lower energy level is too long, the laser threshold is high, and it is easy to self-terminate

[0004] At present, the development of commercial LD ​​pump sources for dysprosium-activated laser crystals is immature, and the existing 1.3 micron Nd 3+ Laser or 1.7 micron Er 3+ The pumping scheme system of lasers is relatively complicated, so it is of great significance to find laser materials in the 4-5 micron band that can be directly pumped by LD

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