New Step by Step Map For KGW Crystal
New Step by Step Map For KGW Crystal
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The thermal conductivity of popular double tungstates is of the purchase to three–four W/(K m) �?which is not negative in contrast with other laser crystals (although a number of instances lower than for YAG), and rather large as opposed Using the thermal conductivity of normal glasses.
The attain bandwidth e.g. of Yb:KGW and Yb:KYW is rather massive as opposed with that of Yb:YAG. This permits for vast wavelength tunability and for Substantially shorter pulse durations from manner-locked lasers. Values very well below 100 fs have already been reached with passive manner locking.
Figure seven demonstrates the calculated dispersion compensation result. The compressed pulse duration is about 185 fs if the period of enter pulses is 150 fs. The discrepancy concerning them might be appreciably diminished with an extended pulse enter because uncompensated higher-purchase dispersion matters considerably less for extended pulses. This configuration was used to clearly show the compressibility of our amplified pulses for the preliminary period of our total method. In the future we'd adopt a grating-pair compressor for great payment for high-get dispersion.
The monoclinic crystal constructions leads to a normal birefringence, helping to stay away from thermally induced polarization rotation and depolarization loss.
]. Etalon insertion would cause more loss, nevertheless, time-to-time optimization would introduce the chance of part hurt and instability to the system. A nonlinear regenerative amplifier could specifically provide pulses which has a length as little as ninety seven fs plus a spectral bandwidth of 19 nm[
A number of strategies have already been adopted to solve this problem. An acousto-optical programmable dispersive filter could be used to modulate the seed’s spectrum to suppress the attain-narrowing result[
Last but not least, we investigated the lengthy-time period performances of SC generation in crystal samples below exceptional pumping problems at better laser repetition prices. In doing so, the crystal samples were not translated and retained in a stationary place with respect to the pump beam through the total measurement. The examples illustrating robust extensive-time period performances of SC generation in KGW and YAG crystals at large laser repetition rates could be located elsewhere. Extra specially, steady efficiency of KGW crystal at two MHz pulse repetition charge under extremely equivalent pump beam focusing geometry was reported recently30, While YAG crystal shown secure effectiveness for many hrs at two hundred kHz pulse repetition amount Despite very tight focusing on the pump beam (NA=0.085)32. The long-phrase efficiency exams in LSO, LYSO and YSO unveiled gradual narrowing with the SC spectra within the very long-wavelength facet that occurred immediately after a certain publicity time and could be attributed on the optical degradation of these products. For illustration, in LSO, the onset of spectral narrowing was noticed just after (sim 20) minutes in a laser repetition fee of 10 kHz, website although at a laser repetition rate of 20 kHz, secure SC generation efficiency was noticed just for about 2 min.
]. This method was dependant on The truth that the spectral emission cross-portion curves vary from one another when laser polarization is paralleled to the various optical axis of Yb-doped double tungstates[
The crimson-shifted Component of the SC spectrum in BGO has the lowest spectral Power density, which can be 1–2 orders of magnitude lessen than in the remainder of the products. Nonetheless, quite minimal Power threshold of SC generation, and small best pump energy in BGO, needs to be identified. The approximated spectral Electrical power densities produced in LSO and LYSO are quite comparable to YAG all through the major A part of the SC spectrum. Essentially the most attention-grabbing locating in that regard is GGG crystal, which, Regardless of really average blue-shifted spectral broadening, makes the largest spectral purple-change and the best spectral Electricity density in the 1600�?000 nm variety, which is nearly an purchase of magnitude larger than that generated in YAG.
These elements can be used for frequency conversion in lasers for extending of tuning array. SRS in crystals is appropriate with current all-sound-point out technologies and offers a quite simple, compact implies of frequency conversion.
-switched output spectrum from the regenerative amplifier supports a sub-one hundred sixty fs pulse amplification. As a result, pulses with energies of around 2 mJ and duration down below 200 fs could be acquired employing higher-quality dichroic mirrors and a broader-spectrum laser seed. This regenerative amplifier is effective as a fantastic pre-amplifier for even more laser amplification.
The scattered photons have a different wavelength and Electrical power than the incident photons, which makes a Raman spectrum.
Equally energies are marked via the dashed traces and their values are labeled while in the plots. The identical functions have been also observed in KGW and YAG crystals, whose spectral broadening dynamics are proven for any comparison in Fig. 4.