Cr: Tm: Ho: YAG; 2094nm; HTC:YAG-manufacture,factory,supplier from China

1. 4  ~ 3 μm laser crystals doped with Er2+, U4+, Ho3+, Dy3+  As an active ion, Ho3+ has achieved laser output in the ~3 μm band (5I6→5I7). In 1976, researchers first realized 2.9 μm laser output in Ho:YAP crystal. In 1990, Bowman et al. obtained 2.85 μm and 2.92 μm laser outputs in Ho:YAP crystals, and obtained 2.92 μm band-tuned laser outputs in Ho:YAP crystals in the following year. In 2017, Nie et al. pumped Ho, Pr: LiLuF4 crystals with a 1 150 nm Raman fiber laser, achieving 2.95 μm watt-level laser output for the first time. In 2018, Zhang et al.

1.2 Near-stoichiometric Lithium Tantalate Crystal Most of the lithium tantalate crystals currently used are grown from melts with the same composition ratio, which is generally called the same composition lithium tantalate (CLT). However, large number of defects affect the physical properties of the CLT crystal, so researchers have conducted study on near-stoichiometric lithium tantalate (NSLT) with less material defects and better physical properties.

2. Fabrication of Lithium Tantalate Crystal2.1 Fabrication of same composition lithium tantalate crystalThe same composition Lithium tantalate (CLT) crystals are often fabricated by mixing high-purity tantalum pentoxide with high-purity lithium carbonate at a stoichiometric ratio of 0.95:1 (molar ratio), and are prepared by the crucible pulling method. The quality of LiTaO3 crystal (www.wisoptic.com) is generally affected by factors such as raw material ratio, pulling speed, seed crystal quality, crucible shape and type.

The variant of refractive indices with temperature is an essential crystal parameter in nonlinear optics. it is well known that the wavelength at which 90° phase-matched 2nd-harmonic era happens depends on temperature. the variation of this wavelength with temperature can be predicted with a understanding of the variant of the refractive indices with temperature and is cited on this paper because the tuning price.

Based on the basic principles of laser damage, researchers have found a breaking through point to solve the problem of laser damage to optical components. But it is very difficult to effectively suppress the source of laser damage in the manufacturing process. Given the variety and complexity of the manufacturing process of optical components, it is necessary to establish the link between the defect formation and the manufacturing process.

Laser damage induced by microscopic defects in optical componentsAccording to the above numerical analysis results, it can be seen that cracks may be generated around the nodule seed and propagate along the radial direction.

2.1 Manipulating and understanding laser damage precursors through material growth processesCombined with the statistical model, information such as precursor density and threshold distribution can be extracted from the damage probability curve, which indirectly reflects the information of the precursor. The analysis shows that the KDP crystal (www.wisoptic.com) mainly contains a precursor with a threshold distribution.

3 The main application of lithium tantalate crystal3.4 Pyroelectric detectorTo detect targets, pyroelectric detectors generally exchange heat with the outside environment through three methods: thermal convection, thermal conduction and thermal radiation. The working principle is: electrons are adsorbed on the surface of the pyroelectric material, and the surface is neutral; the temperature of the material surface changes when heated, and the electric dipole moment of the material changes; in order to keep the surface of the material neutral, the surface releases charges.

Experimental SetupIn order to obtain a 266 nm deep ultraviolet laser with high efficiency and stable operation, this paper built an all-solid-state 266 nm deep ultraviolet laser generation device as shown in Figure 1, which consists of a cavity-dumped all-solid-state Nd:YVO4 laser, a double-frequency system, and a quadruple-frequency system.Fig.

2.2 Fabrication of lithium tantalate crystal with near stoichiometric ratioThe preparation of near-stoichiometric lithium tantalate (NSLT) crystals is difficult. The current methods mainly include: the double crucible method, the flux pulling method, the float zone method and the gas phase exchange equilibrium method. 2.2.1 The double crucible methodIn the double crucible method, the melt material needs to be continuously added to the crucible during the crystal preparation process to keep the melt composition unchanged.