Fascination About KGW Crystal
Fascination About KGW Crystal
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]. A result of the limited storage time, Ti:sapphire is typically pumped by frequency-doubled Nd:YAG or Nd:glass solid-condition lasers, which results in a bulky and complex technique with superior Price. As opposed with conventional CPA laser programs, the OPCPA method can attain a shorter pulse length and a better peak power.
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The main two peaks could possibly be connected to luminescence of pure material59, while the remaining peaks could possibly be attributed to the luminescence of unknown dopants, although the supplier specified the sample as undoped. The luminescence of YAG crystal creates powerful UV luminescence having a optimum intensity at three hundred nm, and that is attributed to merged self-trapped exciton and antisite defect-related emissions60. Ultimately, no luminescence while in the UV, noticeable and around-IR was noticed in KGW and LT crystals, at the least in the detection choice of fiber spectrometer (two hundred�?00 nm).
Its pump laser requires a short pulse length, a very low time jitter, and sleek temporal and spatial distributions because of the intrinsic instantaneous procedure. Thus, the OPCPA system is much more complex and highly-priced.
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Many procedures are already adopted to solve this issue. An acousto-optical programmable dispersive filter may be used to modulate the seed’s spectrum to suppress the get-narrowing impact[
At last, we investigated the prolonged-phrase performances of SC generation in crystal samples underneath ideal pumping ailments at larger laser repetition rates. In doing so, more info the crystal samples were not translated and kept in a stationary position with regard to your pump beam during the whole measurement. The examples illustrating sturdy long-phrase performances of SC era in KGW and YAG crystals at significant laser repetition costs may be observed in other places. A lot more exclusively, stable efficiency of KGW crystal at two MHz pulse repetition level below pretty similar pump beam focusing geometry was reported recently30, While YAG crystal shown stable effectiveness for various several hours at 200 kHz pulse repetition price In spite of really limited concentrating on the pump beam (NA=0.085)32. The extensive-time period performance tests in LSO, LYSO and YSO unveiled gradual narrowing of the SC spectra around the extensive-wavelength side that occurred right after a certain exposure time and could be attributed for the optical degradation of these materials. By way of example, in LSO, the onset of spectral narrowing was noticed soon after (sim twenty) minutes at a laser repetition level of ten kHz, though at a laser repetition level of 20 kHz, steady SC technology overall performance was noticed just for approximately two min.
The actual spectra ended up reconstructed by correcting the calculated spectra having an account for the filter transmission features and for that sensitivity features on the spectrometers at the information put up-processing stage. The spectral dynamics in Every single sample was measured by fantastic tuning the pump pulse Vitality with a computer-managed attenuator that was built-in within the laser process. Thermal Power meter EM (Ophir 3A-PF-12) was utilized to evaluate the SC Power which was thereafter accustomed to work out the spectral Vitality density of your SC radiation. Many of the measurements have been performed without any translation of your sample with respect to your pump beam.
The red-shifted Element of the SC spectrum in BGO has the lowest spectral energy density, and that is 1–two orders of magnitude reduced than in the remainder of the supplies. Even so, very minimal energy threshold of SC generation, in addition to minimal best pump Vitality in BGO, should be identified. The believed spectral Strength densities generated in LSO and LYSO are really similar to YAG all over the major Element of the SC spectrum. Quite possibly the most interesting getting in that regard is GGG crystal, which, Regardless of extremely reasonable blue-shifted spectral broadening, creates the most important spectral red-shift and the very best spectral Electrical power density within the 1600�?000 nm array, which is sort of an buy of magnitude larger than that created in YAG.
相关工作得到了上海扬帆计划、国家重点研发计划、中国科学院战略性先导科技专项、国家自然科学基金项目、上海市优秀学术/技术带头人计划、上海市市级科技重大专项、中国科学院青年创新促进会的支持。（强场激光物理国家重点实验室供稿）
-switched output spectrum of your regenerative amplifier supports a sub-a hundred and sixty fs pulse amplification. Hence, pulses with energies of as many as 2 mJ and period under two hundred fs can be obtained utilizing increased-top quality dichroic mirrors and also a broader-spectrum laser seed. This regenerative amplifier will work as a fantastic pre-amplifier for further laser amplification.
Figure 4 Beam radius variation on the two crystals even though switching the focal duration on the thermal lensing impact.
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