The smart Trick of KGW Crystal That Nobody is Discussing
The smart Trick of KGW Crystal That Nobody is Discussing
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Though ytterbium-doped laser attain media usually exhibit a small quantum defect, ytterbium-doped tungstates let for significantly smaller values. Such as, a 1030-nm Yb:YAG laser would Generally be pumped close to 940 nm, whereas Yb:KGW or Yb:KYW may be most efficiently pumped all-around 981 nm.
Sooner or later, an investigation over the spectral get curve of Yb:KGW in the primary amplifier is going to be performed under cryogenic temperature evolution from seventy seven K to three hundred K. The Performing temperature will be controlled to understand broader acquire bandwidth and less shift for the central wavelength of the principle amplifier.
The 1st two peaks may very well be associated with luminescence of pure material59, when the remaining peaks may very well be attributed to your luminescence of unidentified dopants, although the provider specified the sample as undoped. The luminescence of YAG crystal makes robust UV luminescence using a maximum depth at 300 nm, which is attributed to merged self-trapped exciton and antisite defect-connected emissions60. At last, no luminescence from the UV, noticeable and near-IR was noticed in KGW and LT crystals, not less than inside the detection variety of fiber spectrometer (two hundred�?00 nm).
-switched manner. The bandwidth during the orthogonal orientation was Obviously A great deal broader. The calculated Fourier change confined pulse duration was as short as sub-one hundred sixty fs. Beneath the configuration where by The 2 crystals ended up positioned in the same orientation, With all the seed input, the amplified pulse bandwidth was only three nm with a hundred and eighty μJ Strength when it broke the dichroic mirrors.
]. Etalon insertion would bring on supplemental reduction, nonetheless, time-to-time optimization would introduce the potential risk of element damage and instability on the system. A nonlinear regenerative amplifier could directly deliver pulses that has a period as low as ninety seven fs and a spectral bandwidth of 19 nm[
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Finally, we investigated the very long-time period performances of SC technology in crystal samples under optimal pumping situations at increased laser repetition prices. In doing this, the crystal samples were not translated and retained inside a stationary situation with respect towards the pump beam through the full measurement. The examples illustrating sturdy long-time period performances of SC technology in KGW and YAG crystals at higher laser repetition rates could be observed somewhere else. Far more specially, steady general performance of KGW crystal at two MHz pulse repetition amount beneath really related pump beam concentrating geometry was reported recently30, While YAG crystal shown stable efficiency for a number of hours at two hundred kHz pulse repetition fee Despite having pretty limited focusing from the pump beam (NA=0.085)32. The lengthy-time period effectiveness tests in LSO, LYSO and YSO disclosed gradual narrowing in the SC spectra over the extended-wavelength side that transpired following a specific exposure time and will be attributed into the optical degradation of those materials. For example, in LSO, the onset of spectral narrowing was noticed after (sim 20) minutes in a laser more info repetition price of ten kHz, while at a laser repetition price of 20 kHz, stable SC generation functionality was noticed just for roughly two min.
Though BGO and LT made the narrowest SC spectra (a little lower than one.5 optical octaves), they might be considered as really beautiful nonlinear resources for broadband SC technology with pumping at for a longer time laser wavelengths. Owing to its huge nonlinearity, BGO exhibited the bottom SC generation threshold (seventy eight nJ) Among the many investigated elements, and that is 25 % reduce than in KGW and will be considered as fantastic nonlinear substance for quite minimal-threshold SC technology. The observed stable and sturdy harm-totally free effectiveness of BGO and GGG at two hundred kHz pulse repetition charge implies that these nonlinear components have a potential for SC generation at even bigger, MHz, repetition premiums. Also, these components offer SC radiation with a wonderful set of parameters which are important for applications in significant speed spectroscopy and imaging that make use of bulk-produced SC, see e.g.17,eighteen,19,twenty.
Figure four Beam radius variation on the two crystals when shifting the focal size on the thermal lensing result.
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 laser output beneath the two crystal placement configurations. The black line denotes the configuration With all the crystals positioned in a similar orientation, though the purple line is under the configuration of crystals positioned in orthogonal orientation.
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The two energies are marked by the dashed traces as well as their values are labeled from the plots. The similar capabilities have been also noticed in KGW and YAG crystals, whose spectral broadening dynamics are revealed for a comparison in Fig. four.