CLBO Crystal Fundamentals Explained
CLBO Crystal Fundamentals Explained
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We summarized The existing progress standing from the significant-electricity DUV laser equally in the wavelength of FHG of the one-μm laser and at 193 nm. The current enhancement from the good-state/fiber laser, and also the nonlinear optical crystals, prompts not only the common power but in addition the beam high-quality (coherence) from the DUV lasers to an unprecedented degree.
The common electrical power of your NIR laser however has the likely to be enhanced to tens of watts including 70 W [26] If your double-pass configuration may very well be utilized to the Yb:YAG SCF amplifier stage. Therefore, In case the conversion effectiveness of 31% from NIR to DUV could be still preserved at this increased electricity condition, the common output power with the DUV laser at 258 nm can be much more than twenty W, which would certainly be a remarkable power amount for your DUV laser and bring on the unanticipated DUV laser machining results. In addition, for prime-ability DUV laser, the UV problems from the nonlinear crystal, including the Home windows for CLBO crystal as well as mirrors, is an additional vital parameter for long lasting and secure operation.
On the flip side, the beam high quality of this bigger electricity DUV laser would turn out to be even worse due to more serious thermal and nonlinear effects. For this reason, the frequency conversion procedures needs to be very carefully built to mitigate the aforementioned consequences. So, a high-energy DUV laser on the FHG of 1 μm with an excellent beam top quality may be received and can be helpful for obtaining the shorter wavelength DUV lasers like 193 nm by SFG.
A result of the thermal lens influence inside the sound-point out lasers, If your heating management is inadequate, It is far from quick to get the strong-condition laser by using a large electricity and a high beam excellent simultaneously. Lately, with the event of The skinny disk laser and one-crystal fiber (SCF) laser, a superior-power laser at the elemental wavelength (one μm) were recognized with an excellent beam high-quality In spite of a TEM00 mode beam [four,24], which would be good candidates for the fundamental with the DUV laser technology. A further applicant for the basic is definitely the higher-electric power fiber laser which could be accomplished by coherent beam combination with M2 value less than one.
On one other facet, the power scaling of your NIR laser is an additional factor to raise the typical ability on the 193-nm DUV laser. Due to more info insufficient the superior-electricity amplification Answer of your NIR laser (for instance at 1553 nm), nonlinear frequency procedures for example optical parameter oscillation (OPO) might be applied to produce a wavelength converter by shifting the wavelength from 1 μm to the specified wavelength as well as getting relative increased power [21]. Not long ago, a diamond Raman laser confirmed its capability in accomplishing a higher power as well as a higher conversion effectiveness with the 1st Stokes with the one-μm laser [22,23], which suggests the possibility to get utilized from the 193-nm DUV laser era as a consequence of its significant Raman get and huge frequency change.
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The pulse length of the next Stokes light was shortened to 5 ns as proven in Figure 7a, an individual-shot picture within the oscilloscope, and that is a standard phenomenon in Raman laser [44] when the pulse period with the pump laser was ten ns.
Also, combining the reliable-point out laser with other nonlinear procedure like stimulated Raman scattering, NIR lasers can be accomplished at new wavelengths with large electrical power and significant beam high-quality, which was examined through the proof-of-theory experiment. This Raman laser plan presents a new path to the significant-electricity DUV laser, Specially on the wavelength of 193 nm.
Tunable ultraviolet laser resource dependant on solid-point out dye laser technologies and CsLiB6O10 harmonic generation
Its UV absorption edge reaches one hundred eighty nm. The efficient nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about 2 times as massive as that of KDP. CLBO crystals could be developed from your stoichiometric melt with lessen viscosity.
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