5 Simple Statements About KGW Crystal Explained
5 Simple Statements About KGW Crystal Explained
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The thermal conductivity of popular double tungstates is with the buy to three–four W/(K m) �?which is not bad as opposed with other laser crystals (Whilst several situations a lot less than for YAG), and reasonably massive when compared With all the thermal conductivity of regular Eyeglasses.
In the future, an investigation within the spectral achieve curve of Yb:KGW in the primary amplifier might be done less than cryogenic temperature evolution from seventy seven K to 300 K. The Performing temperature might be managed to realize broader gain bandwidth and fewer change for the central wavelength of the leading amplifier.
In conclusion, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear components for broadband SC generation within the around-infrared and brief-wave infrared spectral ranges, when pumped by one hundred eighty fs elementary harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO generated two octave-spanning SC spectra, which Assess to SC spectra produced in YAG. These elements exhibit quite identical performances to YAG also concerning threshold and exceptional pump pulse energies for SC era. However, for what concerns the chance to function at large laser pulse repetition charge, YSO, LSO and LYSO show long lasting operation only at 10 kHz and immediately degrade (inside of a couple of minutes) at twenty kHz. Apart from the fairly small SC era threshold (169 nJ), GGG shown exceptional performance features during the brief-wave infrared Along with the exceptional pump pulse Power of 464 nJ, which can be two periods lower than in YAG: the biggest purple-shifted spectral broadening and the best spectral Power density, outperforming KGW and YAG crystals in that factor.
-switched manner. The bandwidth inside the orthogonal orientation was Plainly A lot broader. The calculated Fourier transform minimal pulse period was as brief as sub-one hundred sixty fs. Under the configuration in which the two crystals have been placed in the identical orientation, Together with the seed input, the amplified pulse bandwidth was only three nm with one hundred eighty μJ Electrical power when it broke the dichroic mirrors.
The comparison with Eyeglasses is acceptable Because the big achieve bandwidth makes it possible for e.g. tungstate femtosecond lasers and tunable lasers to contend with glass lasers.
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Comparison of spectral Strength densities of supercontinua generated within the problems of ideal pumping while in the investigated components.
Whilst BGO and LT produced the narrowest SC spectra (slightly under one.5 optical octaves), they could be seen as incredibly attractive nonlinear materials for broadband SC era with pumping at longer laser wavelengths. Owing to its massive nonlinearity, BGO exhibited the bottom SC generation threshold (seventy eight nJ) among the investigated products, that is 25 % reduce than in KGW and could be considered as great nonlinear content for extremely very low-threshold SC generation. The observed stable and durable problems-totally free performance of BGO and GGG at two hundred kHz pulse repetition level suggests that these nonlinear components have a possible for SC technology at even higher, MHz, repetition premiums. Additionally, these resources give SC radiation with a fantastic set of parameters which can be essential for purposes in high speed spectroscopy and imaging that make use of bulk-created SC, see e.g.seventeen,eighteen,19,20.
We developed a diode-pumped Yb:KGW regenerative amplifier given that the front conclude on the kilohertz terawatt laser program. Broad bandwidth pulses were being acquired by applying twin crystals with distinct orientations of their optical axes[
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The input of the stretcher more info (incident angle: 52°) and that in the compressor incident at the grating had been with the exact side; for this reason, a slight angular tuning with the grating might be manufactured to acquire the most effective compression consequence. In the compressor, the input angle on the grating and the distance between the translation phase (S1) and also the transmission grating (TG) were being built to compensate for that stretcher dispersion and all dispersion introduced by the materials.
The Yb:KGW laser technique has a quasi-three-degree habits. The online gain in the Yb:KGW crystal wasn't large: various tens of roundtrips were being required to amplify the nanojoule seed to some millijoule degree. As a result, the get-narrowing outcome was inescapable in Yb:KGW regenerative amplifiers.
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