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According to the proof-of-principle experiment, the conversion effectiveness of 23% implied the potential for achieving significant-power at the second Stokes wavelength in the Raman laser. In case the pump laser of 1078 nm may be received at the standard energy of 50 W, the output energy of its 2nd Stokes wavelength at 1512 nm may be greater than 10 W. The design of your Raman laser cavity really should be optimized so as to stay away from the harm of the M1 and diamond floor.
The standard power of the NIR laser still has the probable to generally be improved to tens of watts like 70 W [26] Should the double-move configuration could be used to the Yb:YAG SCF amplifier phase. That's why, When the conversion performance of 31% from NIR to DUV might be even now managed at this increased power affliction, the typical output electrical power of the DUV laser at 258 nm may be more than 20 W, which might certainly be a remarkable ability level for the DUV laser and result in the unanticipated DUV laser machining final results. What's more, for top-power DUV laser, the UV damage of the nonlinear crystal, such as the Home windows for CLBO crystal along with the mirrors, is an additional critical parameter for lasting and steady operation.
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A result of the thermal lens impact in the good-condition lasers, If your heating management is inadequate, It is far from effortless to obtain the reliable-state laser that has a higher ability as well as a superior beam good quality simultaneously. Recently, with the event of the thin disk laser and solitary-crystal fiber (SCF) laser, a superior-electricity laser at the elemental wavelength (1 μm) had been recognized with a good beam good quality In spite of a TEM00 method beam [four,24], which would be superior candidates for the fundamental from the DUV laser generation. Yet another applicant for the basic would be the substantial-electricity fiber laser which may very well be realized by coherent beam blend with M2 worth under 1.
On another aspect, the ability scaling in the NIR laser is an additional facet to boost the typical energy of the 193-nm DUV laser. Due to the not enough the substantial-energy amplification Remedy from the NIR laser (for example at 1553 nm), nonlinear frequency processes like optical parameter oscillation (OPO) may very well be applied to make a wavelength converter by shifting the wavelength from one μm to the desired wavelength and also getting relative higher ability [21]. Lately, a diamond Raman laser showed its capability in obtaining a superior electrical power in addition to a higher conversion effectiveness for the 1st Stokes of the 1-μm laser [22,23], which implies the possibility for being utilized inside the 193-nm DUV laser era as a result of its substantial Raman get and huge frequency shift.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the most effective non-linear crystal which generates ultraviolet harmonics of your Nd:YAG fundamental laser wavelength. To be able to improve the harm threshold, low CLBO area roughness, by extremely-precision machining, is required. Because the CLBO crystal has easy hydroscopic response and micro scratches in machining, extremely-exact machining in the CLBO crystal is really a difficult specialized dilemma.
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