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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℃.

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.

3.2 Laser Pretreatment TechnologyLaser pretreatment is a technology that uses sub-threshold laser energy flow to process components before they are practically used. It can effectively improve the ability of some optical components to resist laser damage. The main function of laser pretreatment is to remove defects or reduce thermodynamic response under laser irradiation.

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.

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.

Since defects induce laser damage, and defects are randomly distributed in optical components, the detection and evaluation of laser damage performance of optical components has become another important research content. The standard for laser damage threshold testing was established in the 1990s and has been continuously improved with the development of laser technology and optical materials.

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.

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.

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.

Introduction High-power all-solid-state deep ultraviolet (DUV) lasers have many important applications in scientific research, medical diagnosis, and industrial manufacturing, such as Raman spectroscopy, photobioimaging, integrated circuit etching, and precision micromachining, due to their compact structure, high single-photon energy, and good long-term stability.