Getting My KGW Crystal To Work
Getting My KGW Crystal To Work
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Investigating tumor perfusion by hyperpolarized (13) C MRI with comparison to standard gadolinium distinction-Improved MRI and pathology in orthotopic human GBM xenografts.
Although ytterbium-doped laser obtain media usually show a little quantum defect, ytterbium-doped tungstates let for particularly modest values. For instance, a 1030-nm Yb:YAG laser would Commonly be pumped around 940 nm, While Yb:KGW or Yb:KYW might be most successfully pumped close to 981 nm.
We used a transmission grating (TG) being a dispersive element in our stretcher and compressor. A compact configuration was adopted, in which the stretcher as well as the compressor shared 1 grating comparable to that in Ref.
The very first two peaks might be connected with luminescence of pure material59, although the remaining peaks may be attributed into the luminescence of unidentified dopants, Even though the provider specified the sample as undoped. The luminescence of YAG crystal makes solid UV luminescence by using a optimum intensity at three hundred nm, and that is attributed to blended self-trapped exciton and antisite defect-connected emissions60. Eventually, no luminescence inside the UV, noticeable and in the vicinity of-IR was observed in KGW and LT crystals, a minimum of throughout the detection variety of fiber spectrometer (two hundred�?00 nm).
Substitution from the Laptop for a greater one particular or even a good adjustment of the Laptop orientation along with the applied high voltage is necessary to stay clear of this phenomenon. A quick pulse picker can be utilized to Increase the nanosecond-scale contrast from the output key pulse.
For tungstates, the ytterbium doping concentration can be very substantial devoid of important quenching because the replaced ions have a very related ion radius, plus the inter-ion length is fairly massive.
The other was positioned with its Np -axis parallel With all the s-polarized way. A comparison was manufactured concerning a configuration Together with the crystals put in a similar orientation (
The blended obtain is complicated and should be calculated less than diverse pumping problems because of the quasi-3-stage system actions of website your Yb-doped get medium. The blueshift, with one particular peak from 1037 nm beneath the exact same crystal placement orientation to 1035 nm under the orthogonal crystal placement orientation, could final result within the reabsorption losses at a protracted wavelength inside the crystal exactly where the laser polarization is parallel to its Nm -axis, making the get at 1035 nm increased than that at 1037 nm below orthogonal orientation.
Whilst BGO and LT made the narrowest SC spectra (a little bit below one.5 optical octaves), they may be seen as pretty eye-catching nonlinear products for broadband SC generation with pumping at extended laser wavelengths. Owing to its large nonlinearity, BGO exhibited the lowest SC generation threshold (78 nJ) One of the investigated elements, which is twenty five % reduce than in KGW and could be considered as fantastic nonlinear material for extremely lower-threshold SC era. The observed steady and durable hurt-no cost performance of BGO and GGG at two hundred kHz pulse repetition rate suggests that these nonlinear materials have a potential for SC generation at even bigger, MHz, repetition rates. Also, these elements present SC radiation with a wonderful list of parameters which have been important for programs in large speed spectroscopy and imaging that employ bulk-created SC, see e.g.seventeen,18,19,twenty.
Figure 4 Beam radius variation on The 2 crystals while shifting the focal duration from 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 underneath the two crystal placement configurations. The black line denotes the configuration Using the crystals placed in exactly the same orientation, although the crimson line is under the configuration of crystals placed in orthogonal orientation.
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KGW crystals are employed as Raman scattering products given that they have strong Raman scattering at a range of different wavelengths. Whenever a laser beam is directed on to the crystal, the photons during the laser beam interact with the crystal lattice, triggering a lot of the photons to scatter in a different route.