The KGW Crystal Diaries
The KGW Crystal Diaries
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The primary two peaks can be associated with luminescence of pure material59, though the remaining peaks might be attributed into the luminescence of unidentified dopants, although the supplier specified the sample as undoped. The luminescence of YAG crystal provides powerful UV luminescence by using a highest depth at 300 nm, which can be attributed to combined self-trapped exciton and antisite defect-similar emissions60. Lastly, no luminescence within the UV, noticeable and in the vicinity of-IR was noticed in KGW and LT crystals, at least in the detection variety of fiber spectrometer (200�?00 nm).
-switched manner. The bandwidth inside the orthogonal orientation was clearly Substantially broader. The calculated Fourier change minimal pulse duration was as limited as sub-a hundred and sixty fs. Beneath the configuration in which the two crystals had been placed in exactly the same orientation, Together with the seed enter, the amplified pulse bandwidth was only 3 nm with one hundred eighty μJ Electricity when it broke the dichroic mirrors.
The measured Lower-off wavelengths for the small-wavelength side are in step with the overall development of blue-shifted spectral broadening to the bandgap of nonlinear substance. All of the nonlinear supplies made reasonable crimson-shifted spectral broadenings below situations of optimum pump pulse energies, with the largest crimson-shift exceeding 2000 nm calculated in GGG crystal. Our outcomes uncovered that GGG and BGO (which also experienced the bottom supercontinuum generation threshold) provide sturdy, optical damage-totally free functionality in a laser repetition price of 200 kHz, suggesting that these components are good possibilities to YAG and KGW for lower threshold, higher typical electric power supercontinuum technology from the in close proximity to- and quick-wave infrared spectral ranges. We also demonstrated that scintillating Attributes of bulk materials could be conveniently researched inside the filamentation regime, by using multiphoton excitation utilizing near-infrared femtosecond laser pulses.
Even so, as soon as Nd3+:YAG turned commercially obtainable, the fascination in CaWO4 dropped sharply. In later on many years, certain other tungstate crystals started to appeal to lots of focus.
Scenario Experiments of selected critical technologies invented or co-invented by American Features in only the 1st 20 years of the century
Question RP Photonics for virtually any suggestions concerning tungstate lasers, like femtosecond lasers and high-electric power lasers.
The 2-pump laser could offer nearly a hundred and twenty W energy. Around sixty% of the maximum pump ability was applied inside our experiment considering the low overall performance on the dichroic mirrors. Beneath this dual-crystal configuration, our cavity supports a one hundred W pump ability enter, as discussed in Segment 2.two. Significant-top quality dichroic mirrors will be applied Down the road, and laser pulses will likely be stretched to a longer pulse duration.
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Due to the fact its discovery in 19701,2, the condition of the art of supercontinuum (SC) technology in bulk reliable-state materials has arrived at a high volume of maturity because of great development of ultrafast laser sources and basic understanding of the fundamental Bodily processes3,four. The complexity of Actual physical effects underlying SC technology is unveiled inside the framework of femtosecond filamentation, that is a universal phenomenon arising from nonlinear propagation of femtosecond laser pulses in clear materials5. In additional useful terms, the attainable spectral extent of SC radiation will depend on the material Qualities, for instance linear and nonlinear indexes of refraction and energy bandgap, which together with the laser wavelength determine the significant energy for self-focusing (which has for being exceeded for a lightweight filament to type) and clamping intensity of a lightweight filament (that is proportional for the purchase of multiphoton absorption), respectively.
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Each energies are marked by the dashed lines as well as their values are labeled within the plots. The identical characteristics had been also noticed in KGW and YAG crystals, whose spectral broadening dynamics are shown for your comparison in Fig. 4.