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3.3 Laser pretreatment of dielectric film with large diameter Laser pretreatment technology is the last process before the supply of large-diameter components with dielectric film in NIF devices in the United States. LLNL provides their laser pretreatment device and specifications to each of their supplier of thin film components.

IntroductionLithium tantalate (LiTaO3, referred to as LT), as an excellent multifunctional crystal material, has good piezoelectric, electro-optical and pyroelectric properties, and is ideal for making surface acoustic wave (SAW) filters, resonators, tuners, Q switches and pyroelectric detectors. Devices made from LT crystal (www.wisoptic.com) are widely used in the automotive electronics, 5G communications and infrared detectors, and have broad market prospects.In 1965, Ballman used the pulling method to grow LT single crystal for the first time.

2-5 μm mid-infrared laser crystals have important applications in directional infrared countermeasures, anti-terrorism, biomedicine, environmental monitoring, optical communications, strong field physics, laser fusion, and mid-to-far infrared (nonlinear frequency conversion) basic light sources, etc. With the related development of the pump source technology of semiconductor laser (laser diode, LD), solid-state laser and fiber laser (including resonant pump), mid-infrared crystal has become one of the four main laser crystals developed currently.

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.

03 Experimental results and analysisBy optimizing the cavity length parameters of Nd:YVO4 (www.wisoptic.com) laser under high-power pump injection, a 1064 nm high peak power narrow pulse laser output with an average power of 26 W, a repetition frequency of 20 kHz, and a single pulse width of 5 ns was obtained when the 888 nm pump light power was 65 W; after the 1064 nm fundamental frequency infrared light was doubled by the LBO crystal, a 532 nm laser with a maximum power of 16 W was finally obtained, and the infrared to green light conversion efficiency reached 61.5%.

3.4 Laser pretreatment of DKDP component The laser-damaged precursor of DKDP crystals (provided by WISOPTIC) is in the material body, so it is different from the removal of surface nodule defects in dielectric films. Laser pretreatment cannot remove the precursors in the body, but can only reduce the thermodynamic response of the precursors under laser radiation by improving their absorption intensity. There are still different opinions on this mechanism.

4. Experimental Result and Analysis4.2 Temperature robustness comparison between CPPLN and LBOAs a relatively new nonlinear optical material, CPPLN has a high nonlinear coefficient and a large gain bandwidth. In the foreseeable future, it will have more applications in the fields of industry and medicine. With the increasing demand for polarized crystal materials such as PPLN and CPPLN, the electric field polarization technology of crystals will also have further breakthroughs, and the processing accuracy of polarized crystals will continue to improve.

3 The main application of lithium tantalate crystal3.2 OscillatorAn oscillator is an energy conversion device that converts DC power into AC power with a certain frequency. This circuit is called an oscillation circuit. The oscillator achieves free oscillation through the mutual conversion between magnetic field energy and electric field energy.Oscillators are divided into RC oscillators, LC oscillators and crystal oscillators. The crystal oscillator has a piezoelectric effect, and the crystal will deform when a voltage is applied to the two poles of the wafer.

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.

Conclusion Considering comprehensive factors such as wide absorption bandwidth, large absorption cross section, long upper energy level lifetime (ms to tens of ms) (see Table 2), ion cross relaxation, increased quantum efficiency, and mature LD pump source, Tm3+ in the 2 μm band, Ho3+ and Er3+ in the 3 μm band must be one of the most important and basic laser sources in the mid-infrared band from 2 to 20 μm, and will compete with Nd3+ and Yb3+ in the 1 μm band.