Fascination About KGW Crystal
Fascination About KGW Crystal
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Whilst ytterbium-doped laser acquire media frequently show a small quantum defect, ytterbium-doped tungstates make it possible for for specially modest values. Such as, a 1030-nm Yb:YAG laser would Generally be pumped all-around 940 nm, whereas Yb:KGW or Yb:KYW could be most efficiently pumped all over 981 nm.
We utilized a transmission grating (TG) as a dispersive component in our stretcher and compressor. A compact configuration was adopted, exactly where the stretcher as well as compressor shared one particular grating similar to that in Ref.
Figure 7 displays the calculated dispersion compensation consequence. The compressed pulse length is about 185 fs in the event the length of input pulses is a hundred and fifty fs. The discrepancy in between them is going to be significantly diminished with a longer pulse enter since uncompensated high-buy dispersion issues significantly less for lengthier pulses. This configuration was used to clearly show the compressibility of our amplified pulses on the preliminary period of our complete system. In the future we'd adopt a grating-pair compressor for fantastic compensation for prime-get dispersion.
-switched manner. The bandwidth from the orthogonal orientation was clearly A great deal broader. The calculated Fourier change limited pulse duration was as short as sub-160 fs. Underneath the configuration in which The 2 crystals have been positioned in a similar orientation, While using the seed input, the amplified pulse bandwidth was only three nm with 180 μJ Vitality when it broke the dichroic mirrors.
Ahead of the development of Nd:YAG, Nd3+:CaWO4 was an important rare-earth-doped laser gain medium. It was in fact used in the very first repeatedly working crystal laser.
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Finally, we investigated the extended-expression performances of SC technology in crystal samples underneath optimum pumping disorders at higher laser repetition prices. In doing so, the crystal samples weren't translated and saved in a very stationary posture with respect to the pump beam during the full measurement. The illustrations illustrating sturdy extensive-time period performances of SC era in KGW and YAG crystals at large laser repetition charges might be found somewhere else. Extra especially, secure functionality of KGW crystal at 2 MHz pulse repetition fee underneath very related pump beam focusing geometry was reported recently30, whereas YAG crystal demonstrated stable functionality for several hours at two hundred kHz pulse repetition charge even with really restricted focusing of your pump beam (NA=0.085)32. The lengthy-phrase functionality exams in LSO, LYSO and YSO uncovered gradual narrowing on the SC spectra on the lengthy-wavelength aspect that occurred immediately after a certain publicity time and will be attributed to your optical degradation of these components. For example, in LSO, the onset of spectral narrowing was noticed immediately after (sim 20) minutes in a laser repetition amount of ten kHz, even though in a laser repetition fee of 20 kHz, steady SC technology efficiency was noticed just for about 2 min.
Thermal outcomes are noticeably scaled-down in KGW. This combined with the high injury threshold make the crystal a fantastic prospect for energy scaling. Evaluating Ba(NO3)two and KGW for Raman software Ba(NO3)two are more practical in the event of ns pulses and KGW �?in the event of ps pulses.
The 2-pump laser could supply as many as a hundred and twenty W electrical power. Close to sixty% of the maximum pump electric power was utilized within our experiment considering the very low general performance on the dichroic mirrors. Below this dual-crystal KGW Crystal configuration, our cavity supports a 100 W pump energy input, as talked over in Part 2.2. High-quality dichroic mirrors is going to be applied Later on, and laser pulses might be stretched to an extended pulse period.
Though BGO, GGG, YSO, LSO and LYSO occasionally function laser hosts37, They are really largely recognized as productive scintillators, whose scintillation Houses are studied fairly well38. Nonetheless, the nonlinear optical Homes of these crystals and so their prospective to serve as nonlinear products for SC generation specifically, and any other experiments regarding nonlinear propagation of extreme femtosecond laser pulses, keep on being quite poorly studied. To this point, GGG, LT23,25 and YSO24 have been only sketchily tested for SC generation with Ti:sapphire laser pumping, having said that, to the most effective of our know-how, none of the investigated products ended up examined with Yb-laser pumping, especially for what issues their efficiency at really higher (tens to hundreds of kHz) pulse repetition prices.
The Yb:KGW laser program incorporates a quasi-a few-amount behavior. The net achieve with the Yb:KGW crystal wasn't high: a number of tens of roundtrips have been necessary to amplify the nanojoule seed to your millijoule stage. So, the gain-narrowing result was inescapable in Yb:KGW regenerative amplifiers.
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