Fascination About KGW Crystal
Fascination About KGW Crystal
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Past work showed that the dual-crystal configuration can be utilized to compensate for your thermal lensing result[
Even though ytterbium-doped laser attain media frequently exhibit a small quantum defect, ytterbium-doped tungstates enable for especially compact values. As an example, a 1030-nm Yb:YAG laser would Usually be pumped about 940 nm, whereas Yb:KGW or Yb:KYW might be most efficiently pumped close to 981 nm.
In the future, an investigation to the spectral achieve curve of Yb:KGW in the most crucial amplifier are going to be carried out underneath cryogenic temperature evolution from 77 K to 300 K. The working temperature will likely be managed to realize broader get bandwidth and less shift at the central wavelength of the leading amplifier.
In summary, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are efficient nonlinear materials for broadband SC technology inside the in close proximity to-infrared and small-wave infrared spectral ranges, when pumped by one hundred eighty fs elementary harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO produced two octave-spanning SC spectra, which Look at to SC spectra made in YAG. These products exhibit rather equivalent performances to YAG also concerning threshold and ideal pump pulse energies for SC era. However, for what worries the chance to operate at large laser pulse repetition rate, YSO, LSO and LYSO display sturdy Procedure only at ten kHz and rapidly degrade (within a couple of minutes) at twenty kHz. Other than the comparatively very low SC technology threshold (169 nJ), GGG shown superb effectiveness characteristics in the short-wave infrared With all the exceptional pump pulse Vitality of 464 nJ, which happens to be two periods reduce than in YAG: the largest pink-shifted spectral broadening and the best spectral Electrical power density, outperforming KGW and YAG crystals in that aspect.
Its pump laser requires a short pulse length, a reduced time jitter, and sleek temporal and spatial distributions due to the intrinsic instantaneous approach. Consequently, the OPCPA procedure is more sophisticated and highly-priced.
Prior to the development of Nd:YAG, Nd3+:CaWO4 was a vital scarce-earth-doped laser attain medium. It absolutely was in truth Utilized in the initial constantly running crystal laser.
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At last, we investigated the extensive-phrase performances of SC era in crystal samples underneath exceptional pumping problems at higher laser repetition charges. In doing so, the crystal samples weren't translated and stored in a very stationary placement with regard for the pump beam in the course of the whole measurement. The examples illustrating sturdy very long-term performances of SC era in KGW and YAG crystals at high laser repetition prices could be discovered somewhere else. More exclusively, secure overall performance of KGW crystal at 2 MHz pulse repetition level beneath pretty equivalent pump beam concentrating geometry was claimed recently30, whereas YAG crystal demonstrated steady performance for many hrs at two hundred kHz pulse repetition rate Despite pretty limited concentrating with the pump beam (NA=0.085)32. The long-term overall performance tests in LSO, LYSO and YSO unveiled gradual narrowing with the SC spectra over the extensive-wavelength facet that happened just after a specific publicity time and will be attributed for the optical degradation of these supplies. As an example, in LSO, the onset of spectral narrowing was observed immediately after (sim 20) minutes at a laser repetition fee of 10 kHz, although at a laser repetition charge of 20 kHz, stable SC generation overall performance was noticed just for roughly two min.
We plan to boost the pulse Vitality to previously mentioned forty mJ in two-phase multi-go amplifiers, similar to a attain variable of twenty. In Just about every amplifier, we will likely undertake two cascaded crystals positioned beneath orthogonal orientation to decrease the thermal load on Each and every crystal and compensate for the gain-narrowing outcome.
First of all, Considering that the filament-induced luminescence originates from simultaneous absorption of various photons, whose complete energy exceeds the bandgap Electricity of material, it provides uncomplicated separation of excitation and emission wavelengths and presents incredibly powerful sign Even with staying emitted in excess of the whole solid angle. The situation in the filament track Within the crystal could be easily modified inside a wished-for way by various the pump pulse Vitality, whereas the depth clamping in a light filament enormously lowers the potential risk of optical hurt. These attributes is often useful for getting extra information regarding crystal homogeneity and expose the presence and distribution of various dopants in the sample.
The Martinez stretcher get more info stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The input in the stretcher (incident angle: 52°) Which on the compressor incident on the grating were being from your identical side; therefore, a slight angular tuning of the grating might be created to obtain the very best compression result. From the compressor, the enter angle about the grating and the gap in between the interpretation stage (S1) along with the transmission grating (TG) had been meant to compensate with the stretcher dispersion and all dispersion released with the elements.
KGW has a strong Raman spectrum that extends through the ultraviolet to your near infrared, making it beneficial for A selection of purposes. The crystal can be employed as being a reference materials for Raman spectroscopy, in addition to a sample for learning Raman scattering in the sound state.
The scattered photons have a distinct wavelength and energy when compared to the incident photons, which results in a Raman spectrum.
]. The dual-crystal configuration lowers the thermal load on Each and every crystal even though retaining a higher achieve, and facilitates the compensation of each one’s thermal lensing impact. As a result, the laser cavity can operate with a large steadiness array around the thermal lensing result variation.