5 Simple Statements About KGW Crystal Explained
5 Simple Statements About KGW Crystal Explained
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While ytterbium-doped laser gain media generally exhibit a small quantum defect, ytterbium-doped tungstates allow for for notably small values. For instance, a 1030-nm Yb:YAG laser would Usually be pumped close to 940 nm, whereas Yb:KGW or Yb:KYW could be most effectively pumped all-around 981 nm.
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The purple-shifted part of the SC is of realistic great importance, specifically for what considerations the overall performance of broadly tunable optical parametric amplifiers pumped by the basic harmonics of Yb lasers. The dearth of seed photons in the very long-wavelength location with the SC spectrum restrictions the amplification performance and brings about pulse-to-pulse Vitality fluctuations round the degeneracy location from the optical parametric amplifier. This aspect is quantified in Fig. 6a by plotting the SC spectra with regards to spectral Electricity density, which was approximated by measuring the Power from the axial Section of SC radiation (which happens to be the only real basically practical A part of SC emission). KGW crystal provides the highest spectral Strength density within the 1200�?450 nm selection, as famous inside a latest study30.
Its pump laser demands a brief pulse length, a very low time jitter, and clean temporal and spatial distributions as a result of intrinsic instantaneous course of action. Consequently, the OPCPA process is more intricate and highly-priced.
Amplified pulses with the Electrical power previously mentioned 2.five mJ could be expected by implementing a better pump power to the regenerative amplifier and rendering it function within the saturation degree. The laser fluence of ~one J/cm2 on the dichroic mirrors is considered to become beneath the harm threshold of superior-top quality dielectric-coated mirrors.
The opposite was placed with its Np -axis parallel Together with the s-polarized way. A comparison was made among a configuration Using the crystals positioned in precisely the same orientation (
Comparison of spectral Power densities of supercontinua produced during the situations of optimum pumping from the investigated components.
]. This technique was based on the fact that the spectral emission cross-section curves differ from each other when laser polarization is paralleled to the various optical axis of Yb-doped double tungstates[
Figure four Beam radius variation on The 2 crystals while altering the focal size with the thermal lensing outcome.
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The enter from the stretcher (incident angle: fifty more info two°) Which of the compressor incident at the grating have been within the exact same side; that's why, a slight angular tuning with the grating can be produced to obtain the most effective compression consequence. During the compressor, the enter angle around the grating and the distance among the interpretation phase (S1) and also the transmission grating (TG) had been created to compensate for your stretcher dispersion and all dispersion introduced by the materials.
The Yb:KGW laser procedure includes a quasi-3-amount actions. The online obtain on the Yb:KGW crystal was not superior: numerous tens of roundtrips had been necessary to amplify the nanojoule seed to your millijoule level. As a result, the attain-narrowing outcome was inevitable in Yb:KGW regenerative amplifiers.
Determine eight Intra-cavity pulse amplification system monitored by an oscilloscope. The pulse underwent an unsaturated amplification due to mirror destruction limitation.
The two energies are marked from the dashed strains and their values are labeled during the plots. The similar capabilities had been also noticed in KGW and YAG crystals, whose spectral broadening dynamics are demonstrated for your comparison in Fig. 4.