Fascination About KGW Crystal
Fascination About KGW Crystal
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In summary, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are productive nonlinear elements for broadband SC era within the in the vicinity of-infrared and short-wave infrared spectral ranges, when pumped by one hundred eighty fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO generated two octave-spanning SC spectra, which Look at to SC spectra made in YAG. These resources show really similar performances to YAG also with regard to threshold and exceptional pump pulse energies for SC generation. Even so, for what fears the possibility to function at significant laser pulse repetition charge, YSO, LSO and LYSO display strong operation only at 10 kHz and rapidly degrade (in a few minutes) at twenty kHz. Aside from the relatively minimal SC era threshold (169 nJ), GGG shown fantastic effectiveness features while in the limited-wave infrared Together with the optimum pump pulse Vitality of 464 nJ, and that is two periods decreased than in YAG: the most important crimson-shifted spectral broadening and the highest spectral energy density, outperforming KGW and YAG crystals in that part.
Its pump laser requirements a brief pulse period, a lower time jitter, and sleek temporal and spatial distributions because of the intrinsic instantaneous procedure. Hence, the OPCPA process is much more intricate and highly-priced.
The measured cut-off wavelengths in the shorter-wavelength facet are according to the general craze of blue-shifted spectral broadening around the bandgap of nonlinear product. Every one of the nonlinear supplies manufactured affordable pink-shifted spectral broadenings under ailments of optimum pump pulse energies, with the biggest pink-shift exceeding 2000 nm calculated in GGG crystal. Our results unveiled that GGG and BGO (which also experienced the lowest supercontinuum era threshold) offer resilient, optical harm-free general performance in a laser repetition fee of two hundred kHz, suggesting that these resources are superior alternate options to YAG and KGW for lower threshold, superior typical electricity supercontinuum technology in the near- and brief-wave infrared spectral ranges. We also demonstrated that scintillating Attributes of bulk materials could possibly be conveniently studied while in the filamentation routine, by using multiphoton excitation using close to-infrared femtosecond laser pulses.
Various solutions happen to be adopted to solve this issue. An acousto-optical programmable dispersive filter is often used to modulate the seed’s spectrum to suppress the achieve-narrowing effect[
Lastly, we investigated the extended-phrase performances of SC technology in crystal samples below exceptional pumping problems at bigger laser repetition charges. In doing this, the crystal samples weren't translated and stored in a very stationary placement with regard on the pump beam through the full measurement. The examples illustrating strong extended-time period performances of SC generation in KGW and YAG crystals at substantial laser repetition premiums might be located in other places. Much more especially, secure overall performance of KGW crystal at 2 MHz pulse repetition amount less than extremely equivalent pump beam concentrating geometry was claimed recently30, Whilst YAG crystal demonstrated secure performance for numerous hrs at two hundred kHz pulse repetition price Despite pretty restricted focusing on the pump beam (NA=0.085)32. The extensive-time period functionality assessments in LSO, LYSO and YSO uncovered gradual narrowing of the SC spectra on the extended-wavelength facet that happened soon after a particular publicity time and will be attributed into the optical degradation of these supplies. For example, in LSO, the onset of spectral narrowing was observed just after (sim twenty) minutes at a laser repetition level of 10 kHz, though at a laser repetition amount of twenty kHz, steady SC generation performance was observed just for approximately 2 min.
Although BGO and LT developed the narrowest SC spectra (marginally lower than one.five optical octaves), they could be seen as very eye-catching nonlinear elements for broadband SC technology with pumping at lengthier laser wavelengths. Owing to its massive nonlinearity, BGO exhibited the bottom SC technology threshold (seventy eight nJ) Amongst the investigated materials, which happens to be 25 % reduced than in KGW and will be considered as outstanding nonlinear substance for pretty reduced-threshold SC era. The observed steady and sturdy destruction-totally free functionality of BGO and GGG at 200 kHz pulse repetition charge suggests that these nonlinear resources have a possible for SC generation at even greater, MHz, repetition charges. In addition, these supplies offer SC radiation with an excellent list of parameters which have been important for apps in substantial pace spectroscopy and imaging that use bulk-generated SC, see e.g.seventeen,18,19,20.
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Although BGO, GGG, YSO, LSO and LYSO often serve click here as laser hosts37, They may be largely determined as successful scintillators, whose scintillation properties are researched very well38. However, the nonlinear optical Homes of those crystals and so their potential to function nonlinear supplies for SC technology in particular, and almost every other experiments regarding nonlinear propagation of rigorous femtosecond laser pulses, continue to be very badly researched. Thus far, GGG, LT23,25 and YSO24 had been only sketchily analyzed for SC generation with Ti:sapphire laser pumping, even so, to the best of our know-how, Not one of the investigated supplies ended up examined with Yb-laser pumping, specifically for what worries their functionality at really significant (tens to a huge selection of kHz) pulse repetition charges.
-switched output spectrum on the regenerative amplifier supports a sub-160 fs pulse amplification. Therefore, pulses with energies of as many as 2 mJ and period underneath two hundred fs can be acquired applying larger-quality dichroic mirrors along with a broader-spectrum laser seed. This regenerative amplifier performs as a great pre-amplifier for further laser amplification.
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