The Single Best Strategy To Use For KGW Crystal
The Single Best Strategy To Use For KGW Crystal
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Though ytterbium-doped laser get media frequently exhibit a small quantum defect, ytterbium-doped tungstates permit for notably small values. As an example, a 1030-nm Yb:YAG laser would Usually be pumped all-around 940 nm, While Yb:KGW or Yb:KYW may be most proficiently pumped around 981 nm.
The achieve bandwidth e.g. of Yb:KGW and Yb:KYW is quite large in comparison with that of Yb:YAG. This allows for extensive wavelength tunability and for much shorter pulse durations from manner-locked lasers. Values perfectly underneath a hundred fs have already been realized with passive mode locking.
Hence There is certainly minimal freedom for optimizing the dispersion compensation outcome. Sub-200 fs pulses is often anticipated which has a broader bandwidth seed input. Because of the twin-crystal configuration, the laser cavity delivers a around diffraction minimal laser beam with M
-switched method. The bandwidth from the orthogonal orientation was Plainly Considerably broader. The calculated Fourier change restricted pulse duration was as shorter as sub-a hundred and sixty fs. Beneath the configuration exactly where The 2 crystals ended up positioned in exactly the same orientation, While using the seed input, the amplified pulse bandwidth was only 3 nm with a hundred and eighty μJ Power when it broke the dichroic mirrors.
The calculated Minimize-off wavelengths in the shorter-wavelength side are in line with the overall trend of blue-shifted spectral broadening to the bandgap of nonlinear material. Every one of the nonlinear products made reasonable purple-shifted spectral broadenings under ailments of optimal pump pulse energies, with the biggest pink-shift exceeding 2000 nm calculated in GGG crystal. Our benefits revealed that GGG and BGO (which also had the bottom supercontinuum generation threshold) supply strong, optical problems-totally free overall performance in a laser repetition amount of two hundred kHz, suggesting that these components are excellent options to YAG and KGW for very low threshold, superior normal electrical power supercontinuum technology while in the in the vicinity of- and limited-wave infrared spectral ranges. We also shown that scintillating properties of bulk products may very well be conveniently studied inside the filamentation routine, via multiphoton excitation employing in the vicinity of-infrared femtosecond laser pulses.
One other was placed with its Np -axis parallel Together with the s-polarized direction. A comparison was created involving a configuration Using the crystals positioned in precisely the same orientation (
The blended obtain is sophisticated and should be calculated underneath distinct pumping conditions due to quasi-3-degree system actions on the Yb-doped obtain medium. The blueshift, with one peak from 1037 nm beneath the exact crystal placement orientation to 1035 nm beneath the orthogonal crystal placement orientation, could end result in the reabsorption losses at a long wavelength during the crystal in which the laser polarization is parallel to its Nm -axis, producing the acquire at 1035 nm website higher than that at 1037 nm less than orthogonal orientation.
Despite the fact that BGO and LT created the narrowest SC spectra (marginally below one.5 optical octaves), they might be viewed as really desirable nonlinear materials for broadband SC technology with pumping at longer laser wavelengths. Owing to its large nonlinearity, BGO exhibited the bottom SC era threshold (78 nJ) Amongst the investigated materials, which happens to be twenty five % reduce than in KGW and could be regarded as great nonlinear materials for incredibly minimal-threshold SC generation. The noticed steady and durable damage-no cost general performance of BGO and GGG at two hundred kHz pulse repetition price suggests that these nonlinear products have a possible for SC generation at even increased, MHz, repetition costs. Moreover, these materials give SC radiation with a wonderful set of parameters that are important for programs in significant velocity spectroscopy and imaging that employ bulk-created SC, see e.g.seventeen,18,19,20.
The 2-pump laser could offer around one hundred twenty W electricity. Close to sixty% of the most pump power was used inside our experiment looking at the small general performance from the dichroic mirrors. Under this dual-crystal configuration, our cavity supports a a hundred W pump energy input, as talked about in Segment 2.2. Large-good quality dichroic mirrors might be made use of Down the road, and laser pulses is going to be stretched to an extended pulse length.
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The Yb:KGW laser method provides a quasi-a few-degree habits. The online acquire on the Yb:KGW crystal wasn't high: numerous tens of roundtrips ended up required to amplify the nanojoule seed to a millijoule degree. As a result, the attain-narrowing effect was inevitable in Yb:KGW regenerative amplifiers.
Determine 8 Intra-cavity pulse amplification course of action monitored by an oscilloscope. The heart beat underwent an unsaturated amplification because of the mirror hurt limitation.
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