The Basic Principles Of CLBO Crystal
The Basic Principles Of CLBO Crystal
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All-reliable-condition ultraviolet lasers are broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for the advantages of small volume, extensive lifestyle, superior effectiveness, good beam high quality, huge tuning and narrow spectral line, and so on. Employing large electrical power near-infrared coherent light source as the basic frequency supply determined by nonlinear tuning engineering, creating ultraviolet coherent radiation by multistage frequency conversion is viewed as an essential strategy to produce the ultraviolet coherent gentle supply.
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The crucial element challenge of ultraviolet coherent light-weight resource predominantly concentrates on the development of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is probably the disorders for frequency transformation, so The expansion, dimension, harm resistance, conversion effectiveness and allowable parameter array of nonlinear optical crystal are expected Progressively more.
Alternatively, the beam high quality of this higher energy DUV laser would develop into worse as a result of much more major thermal and nonlinear outcomes. Therefore, the frequency conversion procedures needs to be carefully intended to mitigate the aforementioned consequences. Hence, a high-electricity DUV laser within the FHG of one μm with a fantastic beam high quality may be received and may be effective for getting the shorter wavelength DUV lasers like 193 nm by SFG.
LBO can also be a wonderful nonlinear crystal which is usually placed on the SHG from your NIR towards the inexperienced. The DUV laser will likely be recognized by two phases of SFG within the LBO crystals due to the fact there isn't a stage-matching angle for LBO to transform the environmentally friendly laser at 515 nm or 532 nm into the DUV immediately by SHG [16]. Not long ago, the NSBBF crystal has also proven its possible to obtain a high conversion performance from 532 nm to 266 nm. The stroll-off angle and deff with the NSBBF are Virtually just like Those people of CLBO [seventeen].
On one other facet, the power scaling in the NIR laser is an additional part to enhance the typical electrical power on the 193-nm DUV laser. Due to deficiency of the substantial-electricity amplification Resolution of the NIR laser (one example is at 1553 nm), nonlinear frequency procedures for example optical parameter oscillation (OPO) could be placed on create a wavelength converter by shifting the wavelength from one μm to the desired wavelength and obtaining relative bigger electricity [21]. Lately, a diamond Raman laser showed its means in attaining a high electric power and a large conversion performance with the 1st Stokes on the 1-μm laser [22,23], which means the likelihood being applied while in the 193-nm DUV laser era because of its substantial Raman achieve and enormous frequency shift.
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Within the scientific and industrial apps, the beam excellent of your DUV laser is usually an essential parameter. Especially, the beam excellent in the DUV laser substantially impacts the laser machining effects. The beam top quality from the DUV laser is set by that of the basic laser plus the crystal to the frequency conversion. Recently, a superior-electric power DUV laser (>10 W) at 258 nm was claimed by using a beam top quality of M2 < one.5, which was produced by FHG of the Yb:YAG laser at 1030 nm using the CLBO crystal [13]. This laser would lead to a far better laser machining end result when compared with the prior DUV lasers with much larger M2.
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Tunable ultraviolet laser source dependant on reliable-point out dye laser technology and CsLiB6O10 harmonic generation
Its UV absorption edge reaches one hundred eighty nm. The successful nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about twice as big as that of KDP. CLBO crystals may be developed with the stoichiometric soften with reduced viscosity.
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