The Single Best Strategy To Use For KGW Crystal
The Single Best Strategy To Use For KGW Crystal
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]. Mainly because of the limited storage time, Ti:sapphire is typically pumped by frequency-doubled Nd:YAG or Nd:glass solid-state lasers, which results in a cumbersome and sophisticated process with superior Expense. As opposed with standard CPA laser programs, the OPCPA process can receive a shorter pulse duration and a higher peak electricity.
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The main two peaks can be affiliated with luminescence of pure material59, though the remaining peaks might be attributed to your luminescence of unknown dopants, Even though the provider specified the sample as undoped. The luminescence of YAG crystal makes robust UV luminescence with a maximum depth at 300 nm, which happens to be attributed to combined self-trapped exciton and antisite defect-linked emissions60. Eventually, no luminescence in the UV, obvious and in close proximity to-IR was noticed in KGW and LT crystals, not less than throughout the detection variety of fiber spectrometer (two hundred�?00 nm).
-switched method. The bandwidth in the orthogonal orientation was clearly A lot broader. The calculated Fourier change restricted pulse duration was as quick as sub-one hundred sixty fs. Beneath the configuration in which the two crystals had been positioned in the exact same orientation, with the seed enter, the amplified pulse bandwidth was only three nm with a hundred and eighty μJ Power when it broke the dichroic mirrors.
Amplified pulses with the Electricity above 2.5 mJ might be envisioned by making use of an increased pump power for the regenerative amplifier and making it do the job within the saturation stage. The laser fluence of ~1 J/cm2 on the dichroic mirrors is believed to be below the harm threshold of large-excellent dielectric-coated mirrors.
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Last but not least, we investigated the very long-term performances of SC era in crystal samples less than exceptional pumping situations at increased laser repetition premiums. In doing this, the crystal samples were not translated and retained within a stationary posture with respect on the pump beam throughout the whole measurement. The examples illustrating robust extensive-expression performances of SC era in KGW and YAG crystals at substantial laser repetition premiums may very well be uncovered somewhere else. A lot more specially, steady functionality of KGW crystal at 2 MHz pulse repetition amount below very very similar pump beam focusing geometry was claimed recently30, While YAG crystal shown stable functionality for quite a few hours at 200 kHz pulse repetition charge In spite of extremely tight focusing of your pump beam (NA=0.085)32. The extended-expression performance tests in LSO, LYSO and YSO exposed gradual narrowing on the SC spectra about the prolonged-wavelength aspect that occurred following a certain publicity time and could be attributed towards the optical degradation of those components. As an illustration, in LSO, the onset of spectral narrowing was observed immediately after (sim twenty) minutes at a laser repetition charge of 10 kHz, whilst in a laser repetition fee of 20 kHz, steady SC generation performance was observed just for approximately 2 min.
We program to spice up here the heartbeat energy to over 40 mJ in two-stage multi-pass amplifiers, similar to a acquire issue of twenty. In Every amplifier, we will likely undertake two cascaded crystals positioned underneath orthogonal orientation to lessen the thermal load on Every crystal and compensate for that acquire-narrowing outcome.
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The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The enter from the stretcher (incident angle: 52°) and that of the compressor incident with the grating were being from your similar facet; therefore, a slight angular tuning in the grating might be built to obtain the most effective compression final result. Inside the compressor, the input angle to the grating and the distance amongst the interpretation phase (S1) as well as the transmission grating (TG) had been meant to compensate for that stretcher dispersion and all dispersion launched through the products.
KGW has a strong Raman spectrum that extends within the ultraviolet to your close to infrared, which makes it handy for A variety of apps. The crystal may be used to be a reference product for Raman spectroscopy, in addition to a sample for finding out Raman scattering while in the sound state.
Figure 4 Beam radius variation on The 2 crystals while modifying the focal size in the thermal lensing effect.
Both energies are marked by the dashed lines and their values are labeled during the plots. The similar capabilities were being also noticed in KGW and YAG crystals, whose spectral broadening dynamics are proven for any comparison in Fig. 4.