The Basic Principles Of CLBO Crystal
The Basic Principles Of CLBO Crystal
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We summarized The existing enhancement position from the high-electricity DUV laser equally on the wavelength of FHG in the one-μm laser and at 193 nm. The recent enhancement with the stable-condition/fiber laser, plus the nonlinear optical crystals, prompts don't just the normal electrical power but in addition the beam top quality (coherence) in the DUV lasers to an unparalleled amount.
The typical ability of your NIR laser nonetheless has the probable to be enhanced to tens of watts such as 70 W [26] If your double-pass configuration could possibly be utilized for that Yb:YAG SCF amplifier phase. That's why, Should the conversion effectiveness of 31% from NIR to DUV could be even now maintained at this greater ability problem, the average output electric power of your DUV laser at 258 nm may very well be more than 20 W, which would be considered a remarkable electric power stage to the DUV laser and cause the unanticipated DUV laser machining final results. In addition, for prime-electric power DUV laser, the UV injury in the nonlinear crystal, such as the windows for CLBO crystal along with the mirrors, is an additional significant parameter for long term and stable Procedure.
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Both the 1040 nm and 1078 nm laser originate from 1 twin-wavelength Yb-doped fiber laser. Every laser is amplified by stages of fiber amplifier and Yb-doped elements amplifier, respectively.
On the other side, the facility scaling in the NIR laser is yet another facet to increase the regular electricity from the 193-nm DUV laser. Mainly because of the insufficient the superior-electric power amplification Remedy in the NIR laser (as an example at 1553 nm), nonlinear frequency processes for example optical parameter oscillation (OPO) might be placed on establish a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength and acquiring relative higher electric power [21]. Not too long ago, a diamond Raman laser showed its means in obtaining a substantial energy in addition to a significant conversion effectiveness for the 1st Stokes with the 1-μm laser [22,23], which suggests the possibility being utilized during the 193-nm DUV laser technology as a consequence of its high Raman achieve and large frequency change.
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The heartbeat length of the 2nd Stokes mild was shortened to five ns as proven in Figure 7a, an individual-shot image through the oscilloscope, which can be a common phenomenon in Raman laser [forty four] although the pulse period with the pump laser was ten ns.
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The beam profile revealed in Figure 7b shown more info a superb beam excellent as on the list of deserves of Raman laser, which might be useful to produce a 193-nm DUV laser with a top quality beam.
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