All-stable-point out ultraviolet lasers happen to be widely Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of compact volume, long lifestyle, significant performance, excellent beam high-quality, broad tuning and slender spectral line, and so forth. Making use of substantial ability close to-infrared coherent gentle supply as the elemental frequency supply dependant on nonlinear tuning technologies, making ultraviolet coherent radiation by multistage frequency conversion is thought to be an important way to build the ultraviolet coherent gentle supply.
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According to the proof-of-principle experiment, the conversion efficiency of 23% implied the possibility of achieving significant-electric power at the second Stokes wavelength on the Raman laser. In case the pump laser of 1078 nm might be acquired at the standard electrical power of 50 W, the output electricity of its 2nd Stokes wavelength at 1512 nm can be over 10 W. The design of the Raman laser cavity needs to be optimized in order to stay away from the problems from the M1 and diamond surface.
The normal electric power of the NIR laser still has the opportunity to be improved to tens of watts such as 70 W [26] In case the double-go configuration may be used for your Yb:YAG SCF amplifier phase. For this reason, In the event the conversion effectiveness of 31% from NIR to DUV may be however taken care of at this increased power situation, the typical output energy of the DUV laser at 258 nm may be greater than 20 W, which would be considered a extraordinary power level for your DUV laser and cause the unanticipated DUV laser machining effects. Additionally, for top-electricity DUV laser, the UV damage of your nonlinear crystal, such as the Home windows for CLBO crystal along with the mirrors, is yet another significant parameter for long term and steady Procedure.
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LBO can also be an excellent nonlinear crystal which is usually placed on the SHG in the NIR into the environmentally friendly. The DUV laser is normally recognized by two phases of SFG inside the LBO crystals since there's no stage-matching angle for LBO to transform the inexperienced laser at 515 nm or 532 nm towards the DUV immediately by SHG [sixteen]. A short while ago, the NSBBF crystal has also shown its opportunity to acquire a significant conversion performance from 532 nm to 266 nm. The wander-off angle and deff of the NSBBF are Practically just like Those people of CLBO [seventeen].
On the other facet, the power scaling on the NIR laser is an additional factor to improve the normal electricity in the 193-nm DUV laser. Mainly because of the insufficient the significant-ability amplification Resolution in the NIR laser (for instance at 1553 nm), nonlinear frequency processes like optical parameter oscillation (OPO) may be applied to develop a wavelength converter by shifting the wavelength from one μm to the specified wavelength and obtaining relative bigger ability [21]. Not long ago, a diamond Raman laser showed its potential in accomplishing a substantial electricity along with a high conversion effectiveness in the 1st Stokes of the one-μm laser [22,23], which implies the chance to become utilized during the 193-nm DUV laser generation on account of its superior Raman obtain and huge frequency change.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the best non-linear crystal which generates ultraviolet harmonics in the Nd:YAG elementary laser wavelength. So that you can increase the destruction threshold, low CLBO surface roughness, by ultra-precision machining, is needed. As the CLBO crystal has quick hydroscopic response and micro scratches in machining, ultra-specific machining in the CLBO crystal is actually a tricky technical problem.
Tunable ultraviolet laser supply dependant on strong-point out dye laser technological innovation and CsLiB6O10 harmonic generation
Its UV absorption edge reaches a hundred and eighty nm. The efficient nonlinear optical coefficient of CLBO for frequency doubling at 1064nm click here is about 2 times as substantial as that of KDP. CLBO crystals is usually developed in the stoichiometric melt with decrease viscosity.
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