All-sound-state ultraviolet lasers are already commonly used in the fields of mechanical flaw detection, lithography, micromachining and medicine for the advantages of modest quantity, lengthy everyday living, substantial efficiency, superior beam good quality, vast tuning and narrow spectral line, and so on. Utilizing large electrical power close to-infrared coherent light supply as the elemental frequency resource according to nonlinear tuning technologies, producing ultraviolet coherent radiation by multistage frequency conversion is considered to be a vital way to establish the ultraviolet coherent light-weight source.
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We summarized the current enhancement position of your substantial-electrical power DUV laser each in the wavelength of FHG of your 1-μm laser and at 193 nm. The new growth from the reliable-condition/fiber laser, plus the nonlinear optical crystals, prompts not simply the typical electric power but additionally the beam high quality (coherence) from the DUV lasers to an unparalleled amount.
全固态紫外激光器以其体积小、寿命长、效率高、光束质量好、调谐范围宽、谱线窄等优点，广泛应用于机械探伤、光刻、微加工和医学等领域，等，利用大功率近红外相干光源作为基于非线性调谐技术的基频源，通过多级变频产生紫外相干辐射被认为是发展紫外相干光源的重要途径。紫外相干光源的关键问题是研制紫外波段的非线性光学变频晶体。非线性光学晶体是实现频率变换的条件之一，因此对非线性光学晶体的生长、尺寸、损伤电阻、转换效率和允许的参数范围提出了越来越高的要求。
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LBO is additionally an outstanding nonlinear crystal which is usually placed on the SHG in the NIR to your inexperienced. The DUV laser is normally realized by two stages of SFG in the LBO crystals considering the fact that there is no period-matching angle for LBO to convert the eco-friendly laser at 515 nm or 532 nm towards the DUV directly by SHG [16]. Just lately, the NSBBF crystal has also demonstrated its potential to acquire a higher conversion effectiveness from 532 nm to 266 nm. The stroll-off angle and deff on the NSBBF are almost much like Individuals of CLBO [17].
On another side, the ability scaling of your NIR laser is an additional factor to improve the normal electrical power of your 193-nm DUV laser. Due to lack of the substantial-ability amplification Answer from the NIR laser (such as at 1553 nm), nonlinear frequency processes like optical parameter oscillation (OPO) may very well be applied to develop a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength together with getting relative higher electrical power [21]. A short while ago, a diamond Raman laser showed its capability in acquiring a higher power as well as a superior conversion performance at the 1st Stokes from the 1-μm laser [22,23], which suggests the chance being used during the 193-nm DUV laser generation on account of its significant Raman acquire and huge frequency shift.
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The beam profile revealed in Figure 7b shown a superb beam excellent as among the list of merits of Raman laser, which would be effective to make a 193-nm DUV laser with a top quality beam.
Its UV absorption edge reaches one hundred eighty nm. The powerful nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about two times as significant as that of KDP. CLBO crystals is usually grown through the stoichiometric soften with lessen viscosity.
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