The smart Trick of KGW Crystal That Nobody is Discussing
The smart Trick of KGW Crystal That Nobody is Discussing
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In conclusion, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are efficient nonlinear products for broadband SC era during the near-infrared and brief-wave infrared spectral ranges, when pumped by a hundred and eighty fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO developed two octave-spanning SC spectra, which Evaluate to SC spectra made in YAG. These supplies show very equivalent performances to YAG also concerning threshold and ideal pump pulse energies for SC technology. Even so, for what problems the chance to function at high laser pulse repetition level, YSO, LSO and LYSO display resilient Procedure only at 10 kHz and swiftly degrade (inside of a couple of minutes) at 20 kHz. Other than the reasonably minimal SC technology threshold (169 nJ), GGG demonstrated wonderful overall performance traits within the short-wave infrared Together with the optimal pump pulse Vitality of 464 nJ, that is two situations reduced than in YAG: the most important purple-shifted spectral broadening and the best spectral Electricity density, outperforming KGW and YAG crystals in that component.
-switched mode. The bandwidth while in the orthogonal orientation was Plainly Substantially broader. The calculated Fourier renovate limited pulse duration was as shorter as sub-160 fs. Underneath the configuration the place The 2 crystals ended up placed in exactly the same orientation, with the seed enter, the amplified pulse bandwidth was only three nm with one hundred eighty μJ energy when it broke the dichroic mirrors.
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Down the road, we will adopt a laser seed which has a broader spectral bandwidth and apply an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to help make complete use of the achieve more info bandwidth of our regenerative amplifier.
Eventually, we investigated the prolonged-term performances of SC era in crystal samples below exceptional pumping problems at higher laser repetition rates. In doing this, the crystal samples were not translated and saved in the stationary posture with respect on the pump beam in the entire measurement. The examples illustrating strong extensive-phrase performances of SC generation in KGW and YAG crystals at higher laser repetition premiums could possibly be discovered in other places. Far more precisely, stable functionality of KGW crystal at 2 MHz pulse repetition rate beneath incredibly identical pump beam focusing geometry was noted recently30, While YAG crystal shown stable overall performance for quite a few hrs at 200 kHz pulse repetition charge Despite having incredibly tight focusing on the pump beam (NA=0.085)32. The long-phrase general performance tests in LSO, LYSO and YSO unveiled gradual narrowing of the SC spectra about the prolonged-wavelength aspect that transpired just after a particular publicity time and could be attributed on the optical degradation of these products. For example, in LSO, the onset of spectral narrowing was noticed after (sim 20) minutes in a laser repetition price of 10 kHz, whilst in a laser repetition level of 20 kHz, steady SC era overall performance was observed just for about two min.
The particular spectra ended up reconstructed by correcting the measured spectra by having an account for your filter transmission capabilities and for that sensitivity features of the spectrometers at the information write-up-processing stage. The spectral dynamics in Every sample was calculated by great tuning the pump pulse Strength with a computer-managed attenuator that was built-in in the laser process. Thermal Vitality meter EM (Ophir 3A-PF-twelve) was accustomed to measure the SC Strength which was thereafter accustomed to calculate the spectral Electrical power density from the SC radiation. Many of the measurements had been carried out without any translation with the sample with regard on the pump beam.
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These products can be used for frequency conversion in lasers for extending of tuning vary. SRS in crystals is suitable with present all-sound-condition technological know-how and delivers a very simple, compact implies of frequency conversion.
-switched laser output beneath the two crystal placement configurations. The black line denotes the configuration Along with the crystals placed in the identical orientation, although the red line is under the configuration of crystals put in orthogonal orientation.
Determine eight Intra-cavity pulse amplification procedure monitored by an oscilloscope. The heartbeat underwent an unsaturated amplification due to mirror injury limitation.
]. The twin-crystal configuration lowers the thermal load on Every crystal though retaining a high attain, and facilitates the compensation of each one’s thermal lensing result. Therefore, the laser cavity can perform with a considerable security range over the thermal lensing effect variation.