Not known Facts About KGW Crystal
Not known Facts About KGW Crystal
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Figure seven exhibits the calculated dispersion compensation final result. The compressed pulse length is around 185 fs if the duration of input pulses is one hundred fifty fs. The discrepancy in between them will probably be appreciably lowered with a longer pulse input due to the fact uncompensated high-purchase dispersion matters fewer for for a longer time pulses. This configuration was accustomed to clearly show the compressibility of our amplified pulses in the preliminary stage of our complete procedure. Down the road we would adopt a grating-pair compressor for good compensation for top-order dispersion.
Its pump laser requirements a brief pulse length, a low time jitter, and sleek temporal and spatial distributions because of the intrinsic instantaneous method. Thus, the OPCPA process is more complicated and high priced.
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Eventually, we investigated the lengthy-time period performances of SC technology in crystal samples beneath optimal pumping conditions at greater laser repetition rates. In doing this, the crystal samples were not translated and saved in a very stationary placement with regard on the pump beam over the complete measurement. The illustrations illustrating sturdy extensive-expression performances of SC technology in KGW and YAG crystals at superior laser repetition charges may be observed elsewhere. Additional exclusively, secure functionality of KGW crystal at 2 MHz pulse repetition price beneath very equivalent pump beam concentrating geometry was claimed recently30, whereas YAG crystal shown secure overall performance for many several hours at 200 kHz pulse repetition price Despite quite restricted focusing of your pump beam (NA=0.085)32. The extended-phrase functionality assessments in LSO, LYSO and YSO discovered gradual narrowing with the SC spectra to the very long-wavelength side that happened just after a specific exposure time and could be attributed into the optical degradation of such components. For instance, in LSO, the onset of spectral narrowing was noticed immediately after (sim 20) minutes in a laser repetition charge of ten kHz, when at a laser repetition fee of twenty kHz, stable SC era efficiency was noticed just for about two min.
Despite the fact that BGO and LT created the narrowest SC spectra (a little bit below one.5 optical octaves), they might be considered as really attractive nonlinear resources for broadband SC technology with pumping at for a longer time laser wavelengths. Owing to its significant nonlinearity, BGO exhibited the lowest SC era threshold (seventy eight nJ) among the investigated resources, which is 25 % decrease than in KGW and will be regarded as excellent nonlinear content for quite small-threshold SC generation. The observed stable and durable harm-free of charge effectiveness of BGO and GGG at two hundred kHz pulse repetition amount implies that these nonlinear elements have a potential for SC technology at even increased, MHz, repetition charges. Also, these elements deliver SC radiation with a great set of parameters which are important for apps in substantial speed spectroscopy and imaging that employ bulk-produced SC, see e.g.17,eighteen,19,20.
Determine four Beam radius variation on the two crystals whilst altering the focal duration with the thermal lensing influence.
While BGO, GGG, YSO, LSO and LYSO from time to time function laser hosts37, They may be generally identified as economical scintillators, whose scintillation Homes are examined really well38. Having said that, the nonlinear optical Qualities of those crystals and so their opportunity to function nonlinear supplies for SC more info era specifically, and some other experiments regarding nonlinear propagation of powerful femtosecond laser pulses, remain really badly researched. Thus far, GGG, LT23,25 and YSO24 have been only sketchily examined for SC generation with Ti:sapphire laser pumping, nonetheless, to the very best of our know-how, Not one of the investigated resources ended up examined with Yb-laser pumping, especially for what considerations their efficiency at extremely high (tens to many hundreds of kHz) pulse repetition premiums.
-switched laser output underneath the two crystal placement configurations. The black line denotes the configuration While using the crystals put in a similar orientation, when the purple line is under the configuration of crystals positioned in orthogonal orientation.
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