5 Simple Statements About KGW Crystal Explained
5 Simple Statements About KGW Crystal Explained
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]. Because of the shorter storage time, Ti:sapphire is usually pumped by frequency-doubled Nd:YAG or Nd:glass strong-condition lasers, which leads to a bulky and sophisticated procedure with higher Expense. When compared with conventional CPA laser devices, the OPCPA system can attain a shorter pulse period and a better peak power.
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Determine 8 Intra-cavity pulse amplification process monitored by an oscilloscope. The pulse underwent an unsaturated amplification because of the mirror damage limitation.
In conclusion, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear elements for broadband SC technology from the in the vicinity of-infrared and quick-wave infrared spectral ranges, when pumped by a hundred and 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 created in YAG. These elements exhibit very similar performances to YAG also concerning threshold and optimal pump pulse energies for SC era. Having said that, for what concerns the possibility to work at higher laser pulse repetition charge, YSO, LSO and LYSO demonstrate strong Procedure only at 10 kHz and swiftly degrade (inside of a couple of minutes) at 20 kHz. Aside from the reasonably minimal SC generation threshold (169 nJ), GGG demonstrated exceptional effectiveness features while in the quick-wave infrared Together with the best pump pulse Electricity of 464 nJ, which happens to be two situations decreased than in YAG: the biggest crimson-shifted spectral broadening and the highest spectral Power density, outperforming KGW and YAG crystals in that element.
], but it could insert considerably more Price to this ingredient. The intra-cavity spectral achieve curve might be modulated by inserting an etalon that reduces the actual get within the wavelength with the utmost get factor[
The comparison with glasses is suitable Considering that the huge get bandwidth enables e.g. tungstate femtosecond lasers and tunable lasers to compete with glass lasers.
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Ultimately, we investigated the extensive-expression performances of SC generation in crystal samples below exceptional pumping problems at greater laser repetition rates. In doing this, the crystal samples were not translated and retained in the stationary place with regard towards the pump beam during the overall measurement. The illustrations illustrating strong lengthy-expression performances of SC technology in KGW and YAG crystals at large laser repetition premiums might be located in other places. Extra exclusively, secure overall performance of KGW crystal at 2 MHz pulse repetition level less than very similar pump beam concentrating geometry was reported recently30, Whilst YAG crystal shown secure overall performance for several several hours at 200 kHz pulse repetition rate In spite of extremely limited focusing with the pump beam (NA=0.085)32. The lengthy-time period effectiveness checks in LSO, LYSO and YSO exposed gradual narrowing with the SC spectra about the very long-wavelength facet that occurred following a particular exposure time and will be attributed to the optical degradation of such elements. As an illustration, in LSO, the onset of spectral narrowing was noticed right after (sim twenty) minutes in a laser repetition charge of ten kHz, although in a laser repetition rate of twenty kHz, secure SC generation performance was observed just for approximately two min.
The particular spectra have been reconstructed by correcting the calculated spectra having an account to the filter transmission functions and with the sensitivity features of the spectrometers at the information publish-processing phase. The spectral dynamics in Each and every sample was measured by great tuning the pump pulse Power with a pc-controlled attenuator that was integrated in the laser process. Thermal Electricity meter EM (Ophir 3A-PF-12) was used to evaluate the SC Strength which was thereafter used to work out the spectral energy density of the SC radiation. The many measurements were done with no translation of the sample with respect for the pump beam.
Figure four Beam radius variation on The 2 crystals although switching the focal length on the thermal lensing outcome.
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Tungstates are inclined to possess higher Raman coefficients (�?Raman scattering). For that reason, they might create sizeable Raman obtain at moderate optical intensities. It is possible to make use of the laser crystal by itself to be a Raman converter.
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