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2.3 Lithium tantalate single crystal filmAfter the 1980s, thin film preparation technology has developed rapidly. Currently, the commonly used preparation technologies of lithium tantalate single crystal (www.wisoptic.com) thin film mainly include chemical vapor deposition, physical vapor deposition, magnetron sputtering and sol-gel method.The chemical vapor deposition method synthesizes a thin film on a substrate through a chemical reaction and accurately controls the chemical composition of the product. It has the characteristics of low stress and good quality.

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.

Laser damage induced by microscopic defects in optical componentsNodule defect is a typical representative of microscopic defects, and it is one of the main discoveries in the study of laser damage to thin films in the 1990s. At present, a lot of research has been done on the electric field enhancement and damage characteristics of nodule defects and artificially implanted nodule defects. The damage mechanism of nodular defects has been deeply understood.The nodule defect is the main cause of damage to the fundamental frequency dielectric membrane element.

2.2 Theoretical inversion cognition of precursor characteristics through damage morphologyThe typical damage morphology of multilayer dielectric films with picosecond pulse in the fundamental frequency band is high-density and small-scale. In order to understand the destruction process, we designed a multi-layer dielectric film system with high fundamental frequency and high reflection, and used a 1064 nm 30 ps laser to conduct a destruction experiment. Figure 9 shows a typical damage morphology.

3 The main application of lithium tantalate crystal3.3 E-O Q-SwitchThe basis of laser Q-switched technology is a special optical component - a fast intracavity optical switch generally called Q-switch. The Q value is an indicator for evaluating the quality of the optical resonant cavity. The higher the Q value, the lower the required pump threshold and the easier it is for the laser to oscillate. The purpose of laser Q-switching technology is to compress the pulse width and increase the peak power.

WISOPTIC is using its newly-set coating machine to do in-house vacuum coatings on crystals and optical components.With our own coating machine and technique, we can provide customers products with excellent quality, e.g. higher surface quality, higher transmittance, and higher LIDT etc.Sorts of dielectric coatings (e.g. AR, HR, PR) are available for crystals (KDP/DKDP, KTP, RTP, BBO, LBO, LN, Nd:YAG, etc) and optical components (laser windows, mirrors, PBS, etc).

As the source manufacturer of many kinds of function crystals and the leading producer of DKDP Pockels cell in China, WISOPTIC provides high cost-effective products to its customers worldwide and gains substantial trust from all of its business partners. Every year over 40% of WISOPTIC's products are exported to Europe, UK, North America, Korea, Israel, etc.Normally WISOPTIC takes parts in at least one of the important exhibitions in the industry of photonics and laser, such as Laser World of Photonics (Munich/Shanghai), SPIE Photonics West (San Francisco), KIMES (Seoul), PHOTONIX (To

Study on the efficiency and temperature robustness of chirped PPLN crystal in 1064nm frequency doubling experiment - 06  4. Experimental Result and Analysis4.2 Temperature robustness comparison between CPPLN and LBOWhen the input 1064nm light is 22.53W, the curves of the frequency-doubled optical power generated by CPPLN (www.wisoptic.com) and LBO (www.wisoptic.com) with temperature are shown in Figure 5(a) and Figure 5(b). The half-maximum full width of the frequency-doubled optical power of CPPLN with respect to temperature is 8.40℃, ranging from 24.19℃ to 32.59℃.

3 The main application of lithium tantalate crystal3.1 SAW Wave filterYang Qing-rui and others designed a resonator SAW filter using LiTaO3/SiO2/Si substrate. Figures 3 and 4 are optical photos of the device and partial scanning electron microscopy pictures of the device respectively. The interdigitated electrodes of the device in the picture are clear and no adhesion is seen.

Nanoscale laser damage precursorsDifferent from microscopic defects, defects are called precursors here. Defects generally refer to observable microstructures that are different from the characteristics of the surrounding matrix materials, and are often observed by optical microscopy. The precursors mentioned in this article generally cannot be directly observed by optical methods, and there is no obvious difference in characteristics from the surrounding matrix materials.