All-stable-point out ultraviolet lasers have already been broadly Employed in the fields of mechanical flaw detection, lithography, micromachining and medicine for the benefits of tiny volume, very long everyday living, substantial effectiveness, excellent beam good quality, large tuning and narrow spectral line, etcetera. Employing higher power near-infrared coherent gentle source as the fundamental frequency source based upon nonlinear tuning technologies, building ultraviolet coherent radiation by multistage frequency conversion is regarded as an important solution to develop the ultraviolet coherent light-weight source.

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In accordance with the evidence-of-basic principle experiment, the conversion efficiency of 23% implied the potential of obtaining substantial-electricity at the second Stokes wavelength in the Raman laser. In case the pump laser of 1078 nm may be acquired at the common power of 50 W, the output ability of its 2nd Stokes wavelength at 1512 nm may be over 10 W. The design of your Raman laser cavity need to be optimized in order to steer clear of the injury of your M1 and diamond surface.

The common energy with the NIR laser nonetheless has the likely to generally be improved to tens of watts like 70 W [26] In case the double-pass configuration could possibly be utilized to the Yb:YAG SCF amplifier stage. For this reason, if the conversion performance of 31% from NIR to DUV could possibly be nevertheless preserved at this larger electricity ailment, the typical output electrical power with the DUV laser at 258 nm could possibly be a lot more than 20 W, which might certainly be a remarkable electricity amount to the DUV laser and cause the unanticipated DUV laser machining outcomes. Furthermore, for prime-electric power DUV laser, the UV injury of your nonlinear crystal, including the windows for CLBO crystal and the mirrors, is another important parameter for long run and stable operation.

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Mainly because of the thermal lens influence inside the stable-point out lasers, In case the heating administration is insufficient, It's not uncomplicated to acquire the stable-state laser which has a high electricity along with a high beam high quality concurrently. Recently, with the development of The skinny disk laser and solitary-crystal fiber (SCF) laser, a high-electricity laser at the basic wavelength (1 μm) had been recognized with a very good beam excellent Despite having a TEM00 method beam [4,24], which might be very good candidates for the elemental of your DUV laser technology. A different candidate for the fundamental is definitely the superior-electric power fiber laser which might be accomplished by coherent beam blend with M2 benefit less than 1.

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In the scientific and industrial programs, the beam good quality of your DUV laser is additionally a crucial parameter. Significantly, the beam top quality of your DUV laser significantly impacts the laser machining success. The beam good quality of your DUV laser is determined by that of the elemental laser as well as the crystal for the frequency conversion. Lately, a substantial-electric power DUV laser (>10 W) at 258 nm was claimed which has a beam high-quality of M2 < 1.five, which was generated by FHG of a Yb:YAG laser at 1030 nm using the CLBO crystal [13]. This laser would produce a better laser machining result compared to the former DUV lasers with more substantial M2.

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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the best non-linear crystal which generates ultraviolet harmonics of the Nd:YAG fundamental laser wavelength. To be able to boost the hurt threshold, very low CLBO floor roughness, by extremely-precision machining, is needed. As the CLBO crystal has straightforward hydroscopic reaction and micro scratches in machining, ultra-exact machining on the CLBO crystal is really a hard complex difficulty.

Tunable ultraviolet laser source based upon strong-condition dye laser technology and CsLiB6O10 harmonic technology

The conversion efficiency from essential NIR to DUV is from 5% to 36% in accordance with the described results in Desk 1. Increasing website the conversion effectiveness will reduce the load on the look and setup of the basic laser amplifier along with the electric powered energy intake. A good beam good quality of the elemental laser may also lead into the increasing on the conversion performance and the appropriate energy intensity in the NIR and inexperienced laser during the SHG and FHG process, respectively. The best conversion efficiencies from NIR to environmentally friendly and green to DUV laser by use of CLBO crystal are 70% and close to 50%, respectively [12], which corresponds to the conversion performance of 35% from essential to DUV.

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