CLBO Crystal Secrets
CLBO Crystal Secrets
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The important thing issue of ultraviolet coherent gentle source predominantly focuses on the development of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is amongst the situations for frequency transformation, so the growth, measurement, damage resistance, conversion efficiency and allowable parameter choice of nonlinear optical crystal are expected Increasingly more.
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LBO is likewise a superb nonlinear crystal which is often applied to the SHG through the NIR to the environmentally friendly. The DUV laser will likely be recognized by two stages of SFG inside the LBO crystals due to the fact there is no phase-matching angle for LBO to convert the green laser at 515 nm or 532 nm towards the DUV immediately by SHG [16]. Not too long ago, the NSBBF crystal has also demonstrated its prospective to obtain a substantial conversion performance from 532 nm to 266 nm. The wander-off angle and deff in the NSBBF are Nearly just like These of CLBO [17].
On one other side, the facility scaling in the NIR laser is yet another factor to increase the normal electric power from the 193-nm DUV laser. Due to insufficient the significant-energy amplification Answer in the NIR laser (such as at 1553 nm), nonlinear frequency procedures which include optical parameter oscillation (OPO) could possibly be placed on establish a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength together with obtaining relative greater electricity [21]. A short while ago, a diamond Raman laser showed its capacity in attaining a substantial power and also a significant conversion effectiveness on the 1st Stokes from the one-μm laser [22,23], which suggests the possibility for being applied in the 193-nm DUV laser technology as a consequence of its significant Raman obtain and huge frequency change.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the simplest non-linear crystal which generates ultraviolet harmonics of the Nd:YAG fundamental laser wavelength. In an effort to boost the hurt threshold, small CLBO surface area roughness, by extremely-precision machining, is required. As the CLBO crystal has easy hydroscopic response and micro scratches in machining, ultra-specific machining from the CLBO crystal is usually a complicated specialized challenge.
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The conversion performance from basic NIR to DUV is from five% to 36% according to the documented brings about Table 1. Expanding the conversion efficiency will decrease the stress on the look and setup of the basic laser amplifier and also the electric electricity intake. A good beam high-quality of the elemental laser may also lead on the rising with the conversion performance as well as the appropriate energy intensity in the NIR and inexperienced laser while in the SHG and FHG course of action, respectively. The very best conversion efficiencies from NIR to inexperienced and eco-friendly to DUV laser by use of CLBO crystal are 70% and about fifty%, respectively [twelve], which corresponds on the conversion effectiveness of 35% from fundamental to DUV.
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