Not known Facts About KGW Crystal
Not known Facts About KGW Crystal
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The thermal conductivity of widespread double tungstates is of your purchase to 3–4 W/(K m) �?which isn't poor in contrast with other laser crystals (Whilst many occasions lower than for YAG), and rather big in contrast With all the thermal conductivity of usual Eyeglasses.
We applied a transmission grating (TG) as being a dispersive ingredient within our stretcher and compressor. A compact configuration was adopted, where by the stretcher as well as compressor shared just one grating much like that in Ref.
In conclusion, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are economical nonlinear elements for broadband SC era inside the near-infrared and shorter-wave infrared spectral ranges, when pumped by a hundred and eighty fs fundamental harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO developed two octave-spanning SC spectra, which Review to SC spectra developed in YAG. These supplies show quite equivalent performances to YAG also in terms of threshold and optimum pump pulse energies for SC era. On the other hand, for what considerations the chance to function at higher laser pulse repetition charge, YSO, LSO and LYSO demonstrate tough operation only at 10 kHz and immediately degrade (within a couple of minutes) at twenty kHz. Moreover the relatively reduced SC era threshold (169 nJ), GGG demonstrated exceptional functionality properties while in the small-wave infrared Along with the best pump pulse Power of 464 nJ, which happens to be two situations decreased than in YAG: the most important pink-shifted spectral broadening and the highest spectral Electrical power density, outperforming KGW and YAG crystals in that factor.
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The opposite was placed with its Np -axis parallel While using the s-polarized course. A comparison was designed involving a configuration Together with the crystals placed in a similar orientation (
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The actual spectra have been reconstructed by correcting the measured spectra having an account for that filter transmission capabilities and with the sensitivity capabilities of your spectrometers at the data write-up-processing phase. The spectral dynamics in Each and every sample was calculated by wonderful tuning the pump pulse Vitality with a computer-managed attenuator that was built-in inside the laser program. Thermal energy meter EM (Ophir 3A-PF-12) was used to measure the SC Vitality which was thereafter utilized to calculate the spectral Electricity density with the SC radiation. The many measurements were being done with none translation of the sample with respect towards the pump beam.
The 2-pump laser could offer nearly 120 W electric power. Around sixty% of the utmost pump ability was used in our experiment taking into consideration the reduced performance from the dichroic mirrors. Under this twin-crystal configuration, our cavity supports a a hundred W pump electric power enter, as talked about in Segment 2.2. Substantial-good quality dichroic mirrors might be applied Sooner or later, and laser pulses will likely be stretched to a website longer pulse length.
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The Yb:KGW laser program provides a quasi-3-level actions. The net achieve on the Yb:KGW crystal was not significant: numerous tens of roundtrips were necessary to amplify the nanojoule seed into a millijoule stage. Consequently, the acquire-narrowing result was inevitable in Yb:KGW regenerative amplifiers.
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]. The dual-crystal configuration lowers the thermal load on Every crystal even though sustaining a higher attain, and facilitates the payment of every one’s thermal lensing influence. Thus, the laser cavity can work with a considerable balance vary around the thermal lensing outcome variation.