All-stable-point out ultraviolet lasers happen to be broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for some great benefits of compact volume, lengthy existence, large efficiency, superior beam high-quality, huge tuning and slim spectral line, etc. Making use of significant electricity around-infrared coherent gentle supply as the fundamental frequency resource dependant on nonlinear tuning technology, building ultraviolet coherent radiation by multistage frequency conversion is regarded as a vital solution to produce the ultraviolet coherent mild supply.
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Based on the evidence-of-theory experiment, the conversion performance of 23% implied the potential of obtaining superior-electrical power at the next Stokes wavelength on the Raman laser. In the event the pump laser of 1078 nm may be attained at the standard electricity of 50 W, the output ability of its 2nd Stokes wavelength at 1512 nm could be much more than 10 W. The look with the Raman laser cavity need to be optimized so as to stay away from the hurt in the M1 and diamond surface.
The normal electrical power on the NIR laser nonetheless has the prospective to generally be improved to tens of watts which include 70 W [26] When the double-go configuration may very well be utilized for that Yb:YAG SCF amplifier phase. For this reason, if the conversion performance of 31% from NIR to DUV may very well be however taken care of at this greater energy situation, the common output electricity with the DUV laser at 258 nm can be a lot more than 20 W, which would become a amazing ability level for the DUV laser and lead to the unanticipated DUV laser machining success. What's more, for top-electricity DUV laser, the UV damage of your nonlinear crystal, including the Home windows for CLBO crystal as well as mirrors, is an additional essential parameter for long-lasting and steady Procedure.
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Mainly because of the thermal lens result in the reliable-state lasers, If your heating administration is insufficient, It is far from straightforward to obtain the good-state laser that has a substantial ability as well as a higher beam top quality concurrently. Not long ago, with the event of The skinny disk laser and solitary-crystal fiber (SCF) laser, a superior-power laser at the fundamental wavelength (1 μm) were understood with a very good beam quality Despite having a TEM00 manner beam [four,24], which might be good candidates for the fundamental from the DUV laser technology. Another candidate for the elemental may be the superior-electric power fiber laser which may be reached by coherent beam mix with M2 price a lot less than one.
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While in the scientific and industrial apps, the beam good quality from the DUV laser can also be a crucial parameter. Specifically, the beam top quality in the DUV laser drastically impacts the laser machining outcomes. The beam quality from the DUV laser is determined by that of the elemental laser along with the crystal for your frequency conversion. Lately, a superior-electricity DUV laser (>ten W) at 258 nm was documented which has a beam good quality of M2 < one.five, which was generated by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would bring about a far better laser machining outcome as compared to the past DUV lasers with greater M2.
The heartbeat duration of the 2nd Stokes mild was shortened to five ns as proven in Determine 7a, an individual-shot picture from the oscilloscope, which can be a common phenomenon in Raman laser [forty four] though the heartbeat period from the pump laser was 10 ns.
Moreover, combining the reliable-point out laser with other nonlinear method such as stimulated Raman scattering, NIR lasers may very well be accomplished at new wavelengths with significant energy and significant beam quality, which was tested because of the evidence-of-basic principle experiment. This Raman laser scheme delivers a brand new route to the substantial-ability DUV laser, Particularly on the wavelength of 193 nm.
The beam profile shown in Determine 7b demonstrated a great beam excellent as one of many deserves of Raman laser, which might be beneficial to generate a 193-nm DUV laser with a high quality beam.
The conversion performance from basic NIR to DUV is from five% to 36% according to the claimed leads to Desk 1. Expanding the conversion performance will decrease the stress on the design and set up of the elemental laser amplifier plus the electric electricity use. An excellent beam more info excellent of the fundamental laser may also lead on the expanding in the conversion effectiveness and the appropriate electricity depth of your NIR and green laser inside the SHG and FHG approach, respectively. The very best conversion efficiencies from NIR to inexperienced and inexperienced to DUV laser by utilization of CLBO crystal are 70% and all over fifty%, respectively [12], which corresponds towards the conversion effectiveness of 35% from basic to DUV.
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