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3 The main application of lithium tantalate crystal3.1 SAW Wave filterThere are many studies on filters in SAW devices. Wave filters have the advantages of low transmission loss, high reliability, great manufacturing flexibility, analog/digital compatibility, excellent frequency selection characteristics, and can realize a variety of complex functions.

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.

04 Theoretical study of thermal properties As can be seen from Figure 5 (a), when the BBO crystal (www.wisoptic.com) matching temperature is 60 ℃, as the 266 nm deep ultraviolet laser power gradually increases from 0.32 W to 1.24 W, 2.09 W and 2.25 W, the fitted nonlinear absorption coefficient βNLA also increases continuously, from 0 to 0.079, 0.128, and 0.189 cm/GW, respectively.

03 Experimental results and analysisWhen the green light input power is lower than 4 W, the matching temperature of the BBO crystal has little effect on the output power of the quadrupled 266 nm laser, and when the optimal power of ultraviolet light output is achieved, the temperature offset ΔT of the heating device also tends to be consistent; when the green light input power is greater than 8 W, the higher the matching temperature of the BBO crystal (www.wisoptic.com), the smaller the temperature offset ΔT of the heating device, and the higher the output power of the 266 nm la

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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.

After more than one year’s research work, WISOPTIC has successfully developed two types of dye laser cells – 585nm and 650nm.With advanced technique of coating and optical system design, dye laser headpiece has been developed and will be in mass production soon.Dye laser headpiece 585nm is used mainly to treat facial telangiectasia, and dye laser headpiece 650nm for removal of green tattoo, etc.Dye laser headpiece made from WISOPTIC has higher conversion efficiency than that of any competing product.

1. Research status and future development trend of mid-infrared (2-5 μm) laser crystalsAccording to the order of laser wavelength from short to long, the main material that have achieved laser output (including some optical fibers and transparent ceramics for comparison) are listed in Table 1. Among them, the highest continuous laser output power of laser crystals corresponding to different wave bands is shown in Figure 2. The laser output power of activated ions shows an obvious attenuation trend as the wavelength expands to the mid-infrared direction.

MEASUREMENT TECHNIQUEThe measurement technique consists primarily of a measurement of the variation of the angle of deviation with temperature. The crystals to be measured were 60-60-60° prisms approximately 15 mm on a side. They were attached to a temperature-controlled mount in a vacuum chamber. The temperature could be varied by varying the temperature of a liquid bath above the mount. Temperature was measured by thermocouples attached above and below the crystal. The crystal temperature was assumed to be the average of the two temperatures.

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.