CLBO Crystal Fundamentals Explained
CLBO Crystal Fundamentals Explained
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All-sound-condition ultraviolet lasers are already commonly Employed in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of tiny volume, extensive everyday living, higher efficiency, superior beam quality, vast tuning and slim spectral line, etc. Making use of superior power close to-infrared coherent mild resource as the fundamental frequency supply depending on nonlinear tuning technological know-how, generating ultraviolet coherent radiation by multistage frequency conversion is viewed as an essential technique to acquire the ultraviolet coherent light source.
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We summarized The existing enhancement standing of the higher-electricity DUV laser both on the wavelength of FHG with the 1-μm laser and at 193 nm. The modern development from the sound-condition/fiber laser, and also the nonlinear optical crystals, prompts not only the average electric power but will also the beam high-quality (coherence) in the DUV lasers to an unparalleled amount.
The standard electricity of the NIR laser even now has the potential for being enhanced to tens of watts such as 70 W [26] In case the double-move configuration might be used with the Yb:YAG SCF amplifier stage. Consequently, If your conversion performance of 31% from NIR to DUV could be nevertheless maintained at this larger electric power ailment, the typical output electrical power with the DUV laser at 258 nm can be more than twenty W, which might become a exceptional electrical power degree for the DUV laser and lead to the unanticipated DUV laser machining effects. What's more, for prime-electricity DUV laser, the UV injury from the nonlinear crystal, such as the windows for CLBO crystal as well as mirrors, is an additional important parameter for lasting and stable Procedure.
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On one other aspect, the power scaling on the NIR laser is another factor to increase the normal energy of the 193-nm DUV laser. Due to lack of the significant-ability amplification Remedy in the NIR laser (such as at 1553 nm), nonlinear frequency procedures like optical parameter oscillation (OPO) may be placed on establish a wavelength converter by shifting the wavelength from one μm to the specified wavelength as well as obtaining relative greater electric power [21]. Recently, a diamond Raman laser confirmed its capability in obtaining a substantial electrical power plus a large conversion efficiency at the 1st Stokes of the one-μm laser [22,23], which implies the possibility to generally be utilized inside the 193-nm DUV laser technology because of its significant Raman attain and large frequency change.
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The pulse length of the 2nd Stokes mild was shortened to five ns as shown in Figure 7a, one-shot picture through the oscilloscope, that's a standard phenomenon in Raman laser [44] whilst the heartbeat period from the pump laser was 10 ns.
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The beam profile demonstrated in Determine 7b demonstrated a superb beam good quality as one of the deserves of Raman laser, which might be useful to make a 193-nm DUV laser with a high quality beam.
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 huge as that of KDP. CLBO crystals is usually grown from the stoichiometric more info melt with lessen viscosity.
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