Not known Facts About KGW Crystal
Not known Facts About KGW Crystal
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]. Mainly because of the brief storage time, Ti:sapphire is typically pumped by frequency-doubled Nd:YAG or Nd:glass strong-state lasers, which leads to a bulky and sophisticated procedure with significant Price. In contrast with common CPA laser programs, the OPCPA procedure can receive a shorter pulse length and an increased peak energy.
Although ytterbium-doped laser obtain media generally exhibit a small quantum defect, ytterbium-doped tungstates make it possible for for specifically little values. Such as, a 1030-nm Yb:YAG laser would Generally be pumped about 940 nm, Whilst Yb:KGW or Yb:KYW can be most effectively pumped all-around 981 nm.
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In summary, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are successful nonlinear supplies for broadband SC era from the in close proximity to-infrared and limited-wave infrared spectral ranges, when pumped by one hundred eighty fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO developed two octave-spanning SC spectra, which Assess to SC spectra made in YAG. These products show pretty equivalent performances to YAG also regarding threshold and best pump pulse energies for SC era. On the other hand, for what concerns the likelihood to operate at high laser pulse repetition level, YSO, LSO and LYSO show long lasting Procedure only at 10 kHz and quickly degrade (in just a few minutes) at 20 kHz. In addition to the rather very low SC technology threshold (169 nJ), GGG demonstrated wonderful effectiveness attributes in the shorter-wave infrared With all the optimum pump pulse Electrical power of 464 nJ, which is two times decreased than in YAG: the largest red-shifted spectral broadening and the best spectral Strength density, outperforming KGW and YAG crystals in that component.
Its pump laser needs a short pulse length, a small time jitter, and smooth temporal and spatial distributions because of the intrinsic instantaneous process. Consequently, the OPCPA process is more challenging and expensive.
Amplified pulses with the Electrical power over two.five mJ is often anticipated by making use of a greater pump electric power into the regenerative amplifier and rendering it function within the saturation level. The laser fluence of ~1 J/cm2 around the dichroic mirrors is thought being under the damage threshold of high-high quality dielectric-coated mirrors.
The opposite was positioned with its Np -axis parallel Together with the s-polarized direction. A comparison was manufactured amongst a configuration With all the crystals positioned in the exact same orientation (
The black line denotes the configuration While using the crystals positioned in exactly the same orientation, while the red line is beneath the configuration of crystals placed in orthogonal orientation.
We prepare to boost the heartbeat energy to earlier mentioned 40 mJ in two-phase multi-pass amplifiers, equivalent to a gain aspect of twenty. In Each and every amplifier, we will even undertake two cascaded crystals put less than orthogonal orientation to reduce the thermal load on Every single crystal and compensate to the get-narrowing influence.
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Even though BGO, GGG, YSO, LSO and LYSO at times serve as laser hosts37, These are mainly discovered as effective scintillators, whose scintillation Attributes are examined very well38. Nonetheless, the nonlinear optical Houses of those crystals and so their possible to serve as nonlinear materials for SC era in particular, and every other experiments regarding nonlinear propagation of powerful femtosecond laser pulses, continue to be really badly studied. Thus far, GGG, LT23,twenty five and YSO24 had been only sketchily tested for SC technology with Ti:sapphire laser pumping, nevertheless, to the best of our understanding, Not one of the investigated products had been examined with Yb-laser pumping, specifically for what issues their functionality at extremely large (tens to hundreds of kHz) pulse repetition charges.
-switched output spectrum more info of your regenerative amplifier supports a sub-one hundred sixty fs pulse amplification. Consequently, pulses with energies of as many as 2 mJ and length beneath two hundred fs could be attained making use of greater-good quality dichroic mirrors in addition to a broader-spectrum laser seed. This regenerative amplifier functions as a superb pre-amplifier for even further laser amplification.
The scattered photons have a different wavelength and energy compared to incident photons, which creates a Raman spectrum.
The two energies are marked through the dashed strains as well as their values are labeled from the plots. The equivalent options were being also noticed in KGW and YAG crystals, whose spectral broadening dynamics are proven for just a comparison in Fig. four.