A Secret Weapon For CLBO Crystal
A Secret Weapon For CLBO Crystal
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All-stable-point out ultraviolet lasers are actually greatly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for the benefits of smaller volume, extended existence, higher efficiency, superior beam high quality, large tuning and slim spectral line, etcetera. Using substantial energy near-infrared coherent light-weight source as the elemental frequency supply determined by nonlinear tuning technological innovation, generating ultraviolet coherent radiation by multistage frequency conversion is viewed as an important method to build the ultraviolet coherent gentle supply.
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According to the proof-of-theory experiment, the conversion effectiveness of 23% implied the potential of acquiring higher-electricity at the next Stokes wavelength with the Raman laser. Should the pump laser of 1078 nm could possibly be attained at the standard power of fifty W, the output ability of its 2nd Stokes wavelength at 1512 nm could be more than ten W. The look in the Raman laser cavity needs to be optimized in an effort to stay away from the harm of the M1 and diamond area.
The typical power on the NIR laser however has the likely to be improved to tens of watts including 70 W [26] if the double-move configuration could possibly be used to the Yb:YAG SCF amplifier phase. Hence, In the event the conversion performance of 31% from NIR to DUV could possibly be however managed at this greater power condition, the standard output electricity of your DUV laser at 258 nm might be in excess of twenty W, which would become a amazing electricity amount with the DUV laser and lead to the unanticipated DUV laser machining outcomes. In addition, for prime-electricity DUV laser, the UV hurt with the nonlinear crystal, such as the Home windows for CLBO crystal along with the mirrors, is yet another important parameter for long term and secure Procedure.
On the other hand, the beam excellent of this increased power DUV laser would turn into even worse because of more really serious thermal and nonlinear effects. That's why, the frequency conversion procedures need to be very carefully intended to mitigate the aforementioned outcomes. So, a high-energy DUV laser on the FHG of 1 μm with a good beam high quality could possibly be acquired and will be advantageous for obtaining the shorter wavelength DUV lasers such as 193 nm by SFG.
LBO can be a wonderful nonlinear crystal which is always applied to the SHG with here the NIR towards the inexperienced. The DUV laser will likely be understood by two levels of SFG in the LBO crystals given that there isn't a section-matching angle for LBO to transform the eco-friendly laser at 515 nm or 532 nm into the DUV right by SHG [sixteen]. Just lately, the NSBBF crystal has also demonstrated its likely to get a significant conversion effectiveness from 532 nm to 266 nm. The walk-off angle and deff from the NSBBF are almost comparable to All those of CLBO [17].
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The beam profile shown in Figure 7b demonstrated a fantastic beam high-quality as among the merits of Raman laser, which would be helpful to make a 193-nm DUV laser with a high quality beam.
The conversion efficiency from essential NIR to DUV is from 5% to 36% in accordance with the noted brings about Table one. Growing the conversion performance will reduce the load on the look and setup of the basic laser amplifier as well as the electrical ability usage. A fantastic beam high quality of the basic laser will likely add to your increasing in the conversion effectiveness in addition to the appropriate electric power intensity in the NIR and inexperienced laser from the SHG and FHG system, respectively. The best conversion efficiencies from NIR to environmentally friendly and environmentally friendly to DUV laser by utilization of CLBO crystal are 70% and all around 50%, respectively [12], which corresponds to the conversion performance of 35% from essential to DUV.
The development with the 193-nm laser was shown by levels of SFG. As a way to scale the DUV laser ability efficiently, a completely new notion with the 193-nm DUV laser generation is presented based upon the diamond Raman laser.