5 Tips about KGW Crystal You Can Use Today
5 Tips about KGW Crystal You Can Use Today
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The achieve bandwidth e.g. of Yb:KGW and Yb:KYW may be very huge when compared with that of Yb:YAG. This permits for huge wavelength tunability and for much shorter pulse durations from method-locked lasers. Values properly down below 100 fs have already been accomplished with passive manner locking.
In conclusion, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are economical nonlinear components for broadband SC generation within the in close proximity to-infrared and brief-wave infrared spectral ranges, when pumped by one hundred eighty fs elementary harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO manufactured two octave-spanning SC spectra, which Review to SC spectra generated in YAG. These resources exhibit pretty identical performances to YAG also when it comes to threshold and best pump pulse energies for SC generation. Nevertheless, for what problems the chance to work at significant laser pulse repetition level, YSO, LSO and LYSO clearly show strong Procedure only at 10 kHz and immediately degrade (in a couple of minutes) at twenty kHz. Moreover the fairly very low SC technology threshold (169 nJ), GGG demonstrated exceptional overall performance attributes within the brief-wave infrared Together with the exceptional pump pulse Electricity of 464 nJ, which can be two situations reduce than in YAG: the biggest pink-shifted spectral broadening and the best spectral Electricity density, outperforming KGW and YAG crystals in that element.
Replacement with the Computer for a better 1 or possibly a fantastic adjustment on the PC orientation as well as utilized high voltage is needed to avoid this phenomenon. A quick pulse picker can be employed to improve the nanosecond-scale distinction from the output primary pulse.
Amplified pulses having an Strength earlier mentioned 2.5 mJ might be envisioned by implementing a higher pump electricity to the regenerative amplifier and making it perform with the saturation stage. The laser fluence of ~1 J/cm2 about the dichroic mirrors is considered to be below the damage threshold of high-top quality dielectric-coated mirrors.
Another was put with its Np -axis parallel While using the s-polarized route. A comparison was built concerning a configuration With all the crystals put in exactly the same orientation (
Finally, we investigated the prolonged-expression performances of SC technology in crystal samples less than optimal pumping situations at increased laser repetition premiums. In doing this, the crystal samples weren't translated and held in the stationary place with regard to your pump beam during the overall measurement. The examples illustrating sturdy extended-phrase performances of SC generation in KGW and YAG crystals at superior laser repetition fees might be found in other places. Additional particularly, secure general performance of KGW crystal at 2 MHz pulse repetition rate underneath extremely identical pump beam focusing geometry was noted recently30, While YAG crystal shown secure overall performance for numerous several hours at two hundred kHz pulse repetition price Despite really restricted focusing on the pump beam (NA=0.085)32. The very long-expression functionality exams in LSO, LYSO and YSO disclosed gradual narrowing of the SC spectra within the very long-wavelength facet that happened after a certain exposure time and could be attributed for the optical degradation of these resources. For illustration, in LSO, the onset of spectral narrowing was noticed right after (sim 20) minutes at a laser repetition rate of ten kHz, while in a laser repetition charge of twenty kHz, steady SC generation general performance was observed just for approximately two min.
The particular spectra had been reconstructed by correcting the calculated spectra with an account to the filter transmission capabilities and for the sensitivity capabilities from the spectrometers at the information write-up-processing stage. The spectral dynamics in Every single sample was measured by wonderful tuning the pump pulse Electricity with a pc-controlled attenuator that was integrated in the laser method. Thermal Power meter EM (Ophir 3A-PF-twelve) was utilized to measure the SC Power which was thereafter used to calculate the spectral energy density of your SC radiation. All the measurements were being done without any translation with the sample with respect for the pump beam.
We produced a diode-pumped Yb:KGW regenerative amplifier given that the entrance conclusion of the kilohertz terawatt laser technique. Broad bandwidth pulses were acquired by making use of dual crystals with distinctive orientations in their optical axes[
Though BGO, GGG, YSO, LSO and LYSO occasionally function laser hosts37, they are principally recognized as successful scintillators, whose scintillation Qualities are studied very well38. Nonetheless, the nonlinear optical Houses of these crystals and so their potential to function nonlinear elements for SC generation specifically, and every other experiments relating to nonlinear propagation of intense femtosecond laser pulses, stay incredibly poorly studied. Thus far, GGG, LT23,twenty five and YSO24 have been only sketchily examined for SC era with Ti:sapphire laser pumping, nevertheless, to the best of our information, none of the investigated elements were being examined with Yb-laser pumping, specifically for what concerns their efficiency at incredibly higher (tens to countless kHz) pulse repetition premiums.
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Figure 4 Beam radius variation on the two crystals whilst modifying the focal length of the thermal lensing outcome.
An example of such behaviour is revealed in Fig. 7a. The character of spectral variations is highlighted in Fig. 7d, which displays how the SC spectrum on the extensive-wavelength facet shrinks significantly, from 1800 nm to 1450 nm, just soon after 8 here minutes of publicity time in a very stationary sample. LT crystal shown fairly improved extended-phrase functionality: at pulse repetition fees of approximately one hundred kHz no narrowing on either aspect from the SC spectrum was detected. Nonetheless, rapid narrowing with the SC spectrum in LT crystal was noticed following the main 5 minutes of Procedure when the pulse repetition charge was established at two hundred kHz (info not revealed). In distinction to the above resources, BGO and GGG shown fantastic SC generation performances without any spectral alterations at a pulse repetition fee of two hundred kHz, as attested by the point series of SC spectra in BGO and GGG, shown in Fig. 7b and c, respectively. Figure 7e and file define equivalent designs of SC spectra originally and at the conclusion of one hour-lasting measurement in the two components.