The KGW Crystal Diaries
The KGW Crystal Diaries
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Past function showed that the twin-crystal configuration may be used to compensate for the thermal lensing result[
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In conclusion, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are productive nonlinear supplies for broadband SC generation during the in close proximity to-infrared and quick-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 produced two octave-spanning SC spectra, which Assess to SC spectra created in YAG. These elements show really related performances to YAG also in terms of threshold and optimum pump pulse energies for SC era. On the other hand, for what concerns the likelihood to function at significant laser pulse repetition amount, YSO, LSO and LYSO exhibit long lasting Procedure only at ten kHz and promptly degrade (within just a couple of minutes) at twenty kHz. Aside from the comparatively reduced SC generation threshold (169 nJ), GGG demonstrated excellent efficiency traits within the quick-wave infrared Using the optimal pump pulse Electrical power of 464 nJ, and that is two times reduced than in YAG: the biggest crimson-shifted spectral broadening and the highest spectral Power density, outperforming KGW and YAG crystals in that element.
-switched manner. The bandwidth during the orthogonal orientation was clearly Considerably broader. The calculated Fourier remodel limited pulse duration was as brief as sub-160 fs. Beneath the configuration exactly where The 2 crystals were being put in the exact same orientation, While using the seed enter, the amplified pulse bandwidth was only 3 nm with 180 μJ Electrical power when it broke the dichroic mirrors.
The calculated Slash-off wavelengths at the brief-wavelength aspect are in line with the final trend of blue-shifted spectral broadening within the bandgap of nonlinear content. Many of the nonlinear resources produced realistic red-shifted spectral broadenings under conditions of optimum pump pulse energies, with the largest crimson-change exceeding 2000 nm calculated in GGG crystal. Our outcomes disclosed that GGG and BGO (which also had the lowest supercontinuum era threshold) present durable, optical damage-no cost efficiency in a laser repetition price of two hundred kHz, suggesting that these resources are excellent solutions to YAG and KGW for small threshold, significant regular ability supercontinuum generation inside the in the vicinity of- and small-wave infrared spectral ranges. We also demonstrated that scintillating properties of bulk resources may very well be commonly researched while in the filamentation regime, by means of multiphoton excitation using in close proximity to-infrared femtosecond laser pulses.
Later on, We are going to undertake a laser seed by using a broader spectral bandwidth and utilize an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to create total use on the get bandwidth of our regenerative amplifier.
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Although BGO and LT manufactured the narrowest SC spectra (somewhat less than 1.five optical octaves), they may be viewed as incredibly desirable nonlinear products for broadband SC era with pumping at extended laser wavelengths. Owing to its big nonlinearity, BGO exhibited the lowest SC era threshold (seventy eight nJ) Among the many investigated components, that is 25 % lower than in KGW and could be considered as great nonlinear substance for very small-threshold SC era. The observed steady and sturdy injury-free of charge effectiveness of BGO and GGG at 200 kHz pulse repetition amount suggests that these nonlinear materials have a possible for SC technology at even increased, MHz, repetition rates. Furthermore, these materials present SC radiation with a wonderful set of parameters which can be essential for applications in high pace spectroscopy and imaging that utilize bulk-generated SC, see e.g.seventeen,eighteen,19,20.
To start with, Considering that the filament-induced luminescence originates from simultaneous absorption of various photons, whose full Vitality exceeds the bandgap Strength of material, it offers simple separation of excitation and emission wavelengths and offers really sturdy signal despite remaining emitted in excess of the whole reliable angle. The position on the filament observe inside the crystal can be conveniently altered in a wished-for way by various the pump pulse energy, While the depth clamping in a light-weight filament significantly lowers the potential risk of optical destruction. These attributes is often helpful for getting further specifics of crystal homogeneity and expose the existence and distribution of various dopants in the sample.
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Tungstates are inclined to own large Raman coefficients (�?Raman scattering). Therefore, they could create important Raman acquire at reasonable optical intensities. It is achievable to utilize the laser crystal by itself to be a Raman converter.
The scattered photons have another wavelength and Power as opposed to incident photons, which produces a Raman spectrum.
An example of these kinds of conduct is proven website in Fig. 7a. The character of spectral adjustments is highlighted in Fig. 7d, which reveals how the SC spectrum to the lengthy-wavelength aspect shrinks substantially, from 1800 nm to 1450 nm, just after eight minutes of exposure time in a very stationary sample. LT crystal demonstrated to some degree far better very long-time period overall performance: at pulse repetition premiums of up to a hundred kHz no narrowing on both facet of the SC spectrum was detected. Nonetheless, immediate narrowing in the SC spectrum in LT crystal was observed following the very first 5 minutes of Procedure when the heart beat repetition rate was set at two hundred kHz (knowledge not demonstrated). In distinction to the above mentioned materials, BGO and GGG demonstrated fantastic SC era performances with none spectral variations in a pulse repetition charge of two hundred kHz, as attested by the point series of SC spectra in BGO and GGG, proven in Fig. 7b and c, respectively. Determine 7e and file define equivalent designs of SC spectra at first and at the end of one hour-Long lasting measurement in the two supplies.