Fascination About KGW Crystal
Fascination About KGW Crystal
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Figure eight Intra-cavity pulse amplification approach monitored by an oscilloscope. The pulse underwent an unsaturated amplification as a result of mirror harm limitation.
In summary, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are productive nonlinear materials for broadband SC technology inside the near-infrared and short-wave infrared spectral ranges, when pumped by a hundred and eighty fs essential harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO manufactured two octave-spanning SC spectra, which compare to SC spectra created in YAG. These products exhibit pretty very similar performances to YAG also regarding threshold and optimal pump pulse energies for SC technology. Nonetheless, for what concerns the chance to operate at large laser pulse repetition level, YSO, LSO and LYSO demonstrate sturdy Procedure only at ten kHz and quickly degrade (in a few minutes) at 20 kHz. Apart from the somewhat minimal SC technology threshold (169 nJ), GGG shown excellent performance characteristics in the short-wave infrared Along with the optimal pump pulse Strength of 464 nJ, which happens to be two periods decreased than in YAG: the biggest pink-shifted spectral broadening and the highest spectral Strength density, outperforming KGW and YAG crystals in that factor.
In contrast, the seed laser could be amplified to in excess of 1 mJ beneath the orthogonal orientation configuration.
Amplified pulses with an energy earlier mentioned two.5 mJ may be expected by implementing a higher pump electric power for the regenerative amplifier and making it work with the saturation level. The laser fluence of ~1 J/cm2 over the dichroic mirrors is thought to become down below the damage threshold of high-top quality dielectric-coated mirrors.
The other was put with its Np -axis parallel Together with the s-polarized path. A comparison was created amongst a configuration Along with the crystals positioned in the identical orientation (
Ultimately, we investigated the long-expression performances of SC generation in crystal samples less than best pumping circumstances at bigger laser repetition premiums. In doing this, the crystal samples were not translated and stored in a very stationary position with regard towards the pump beam in the full measurement. The examples illustrating sturdy extensive-time period performances of SC generation in KGW and YAG crystals at significant laser repetition costs may be identified in other places. Additional especially, stable efficiency of KGW crystal at 2 MHz pulse repetition rate less than quite related pump beam concentrating geometry was described recently30, Whilst YAG crystal demonstrated secure overall performance for many hrs at 200 kHz pulse repetition charge even with quite restricted focusing in the pump beam (NA=0.085)32. The long-time period functionality checks in LSO, LYSO and YSO discovered gradual narrowing on the SC spectra about the very long-wavelength side that happened soon after a certain exposure time and will be attributed towards the optical degradation of those products. By way of example, in LSO, the onset of spectral narrowing was noticed just after (sim 20) minutes at a laser repetition price of ten kHz, even though at a laser repetition amount of twenty kHz, steady SC technology efficiency was observed just for about two min.
Hence, with an extra improvement within our regenerative amplifier, 2 mJ compressed pulses is usually expected, with no detrimental any element inside of our compressor.
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Tungstates are likely to obtain superior Raman coefficients (�?Raman scattering). Therefore, they can generate sizeable Raman get more info attain at moderate optical intensities. It can be done to utilize the laser crystal by itself as being a Raman converter.
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Both of those energies are marked because of the dashed lines as well as their values are labeled inside the plots. The equivalent characteristics had been also observed in KGW and YAG crystals, whose spectral broadening dynamics are revealed to get a comparison in Fig. four.