Fascination About KGW Crystal
Fascination About KGW Crystal
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The thermal conductivity of typical double tungstates is of the buy to 3–four W/(K m) �?which isn't poor as opposed with other laser crystals (although a number of periods less than for YAG), and pretty massive as opposed With all the thermal conductivity of common glasses.
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In conclusion, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear materials for broadband SC era from the near-infrared and limited-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 created two octave-spanning SC spectra, which compare to SC spectra created in YAG. These components exhibit rather similar performances to YAG also with regards to threshold and best pump pulse energies for SC era. However, for what issues the chance to operate at superior laser pulse repetition charge, YSO, LSO and LYSO exhibit sturdy Procedure only at ten kHz and speedily degrade (within just a couple of minutes) at twenty kHz. In addition to the rather very low SC technology threshold (169 nJ), GGG demonstrated outstanding general performance qualities inside the limited-wave infrared Along with the optimum pump pulse Electrical power of 464 nJ, that is two situations decreased than in YAG: the largest purple-shifted spectral broadening and the highest spectral energy density, outperforming KGW and YAG crystals in that element.
Its pump laser requirements a short pulse length, a very low time jitter, and sleek temporal and spatial distributions due to intrinsic instantaneous procedure. Hence, the OPCPA program is more complex and high priced.
]. Etalon insertion would lead to extra reduction, nevertheless, time-to-time optimization would introduce the potential risk of part destruction and instability to your method. A nonlinear regenerative amplifier could instantly supply pulses using a period as little as ninety seven fs plus a spectral bandwidth of 19 nm[
Another was put with its Np -axis parallel with the s-polarized path. A comparison was manufactured in between a configuration Along with the crystals placed in the exact same orientation (
The put together gain is complex and should read more be calculated less than distinct pumping conditions due to the quasi-3-degree process actions of the Yb-doped achieve medium. The blueshift, with 1 peak from 1037 nm underneath the very same crystal placement orientation to 1035 nm beneath the orthogonal crystal placement orientation, could final result from your reabsorption losses at a long wavelength during the crystal where by the laser polarization is parallel to its Nm -axis, earning the achieve at 1035 nm higher than that at 1037 nm less than orthogonal orientation.
Hence, with an additional improvement within our regenerative amplifier, two mJ compressed pulses is usually predicted, devoid of harmful any part within our compressor.
We produced a diode-pumped Yb:KGW regenerative amplifier because the front conclusion with the kilohertz terawatt laser program. Broad bandwidth pulses were attained by implementing dual crystals with various orientations in their optical axes[
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Tungstates are inclined to possess significant Raman coefficients (�?Raman scattering). Consequently, they might create sizeable Raman obtain at reasonable optical intensities. It can be done to use the laser crystal itself being a Raman converter.
Determine 4 Beam radius variation on The 2 crystals whilst switching the focal size of the thermal lensing influence.
Both of those energies are marked by the dashed lines and their values are labeled while in the plots. The identical functions have been also noticed in KGW and YAG crystals, whose spectral broadening dynamics are proven for your comparison in Fig. four.