Prior function confirmed that the twin-crystal configuration may be used to compensate with the thermal lensing outcome[
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The gain bandwidth e.g. of Yb:KGW and Yb:KYW is extremely huge when compared with that of Yb:YAG. This permits for huge wavelength tunability and for Substantially shorter pulse durations from manner-locked lasers. Values very well under one hundred fs are already realized with passive method locking.
The 1st two peaks may very well be affiliated with luminescence of pure material59, though the remaining peaks could be attributed to the luminescence of unknown dopants, Even though the supplier specified the sample as undoped. The luminescence of YAG crystal provides solid UV luminescence which has a optimum intensity at three hundred nm, which can be attributed to mixed self-trapped exciton and antisite defect-similar emissions60. Eventually, no luminescence while in the UV, visible and in close proximity to-IR was observed in KGW and LT crystals, no less than inside the detection array of fiber spectrometer (two hundred�?00 nm).
Alternative on the Computer system for a greater a single or perhaps a good adjustment of your Personal computer orientation as well as utilized significant voltage is required to stay away from this phenomenon. A fast pulse picker can be utilized to Increase the nanosecond-scale contrast with the output principal pulse.
For tungstates, the ytterbium doping focus can be extremely high devoid of important quenching since the replaced ions have an incredibly very similar ion radius, plus the inter-ion length is relatively significant.
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Ultimately, we investigated the extensive-phrase performances of SC technology in crystal samples below exceptional pumping situations at bigger laser repetition costs. In doing this, the crystal samples weren't translated and saved in the stationary position with respect towards the pump beam throughout the overall measurement. The examples illustrating sturdy lengthy-time period performances of SC generation in KGW and YAG crystals at significant laser repetition prices can be observed elsewhere. A lot more precisely, steady functionality of KGW crystal at two MHz pulse repetition charge under quite related pump beam concentrating geometry was documented recently30, While YAG crystal demonstrated stable effectiveness for various hours at two hundred kHz pulse repetition charge Despite having really tight focusing with the pump beam (NA=0.085)32. The extended-time period overall performance exams in LSO, LYSO and YSO discovered gradual narrowing on the SC spectra around the extensive-wavelength aspect that transpired soon after a certain exposure time and could be attributed on the optical degradation of those supplies. For illustration, in LSO, the onset of spectral narrowing was noticed following (sim twenty) minutes in a laser repetition charge of 10 kHz, although in a laser repetition charge of twenty kHz, stable SC technology functionality was noticed just for about 2 min.
]. This process was based upon the fact that the spectral emission cross-segment curves vary from one another when laser polarization is paralleled to the different optical axis of Yb-doped double tungstates[
The two-pump laser could present up to 120 W electricity. About sixty% of the most pump power was applied in our experiment taking into consideration the very low general get more info performance of the dichroic mirrors. Under this dual-crystal configuration, our cavity supports a 100 W pump energy input, as talked about in Area two.2. Substantial-quality dichroic mirrors will be utilized Later on, and laser pulses will probably be stretched to a longer pulse length.
These materials may be used for frequency conversion in lasers for extending of tuning vary. SRS in crystals is appropriate with present-day all-good-point out technology and provides a very simple, compact means of frequency conversion.
The Yb:KGW laser method features a quasi-three-level habits. The online obtain with the Yb:KGW crystal was not large: numerous tens of roundtrips were being needed to amplify the nanojoule seed to a millijoule level. Thus, the acquire-narrowing effect was inescapable in Yb:KGW regenerative amplifiers.
Determine eight Intra-cavity pulse amplification approach monitored by an oscilloscope. The heartbeat underwent an unsaturated amplification because of the mirror harm limitation.
An example of these kinds of behaviour is demonstrated in Fig. 7a. The character of spectral improvements is highlighted in Fig. 7d, which displays how the SC spectrum on the prolonged-wavelength side shrinks substantially, from 1800 nm to 1450 nm, just following eight minutes of exposure time in the stationary sample. LT crystal demonstrated to some degree greater long-expression general performance: at pulse repetition costs of nearly a hundred kHz no narrowing on possibly aspect of your SC spectrum was detected. Nevertheless, fast narrowing of the SC spectrum in LT crystal was observed following the very first 5 minutes of operation when the heart beat repetition amount was set at 200 kHz (knowledge not proven). In contrast to the above products, BGO and GGG demonstrated exceptional SC generation performances without any spectral improvements at a pulse repetition amount of 200 kHz, as attested by the point number of SC spectra in BGO and GGG, shown in Fig. 7b and c, respectively. Figure 7e and f define equivalent designs of SC spectra originally and at the conclusion of 1 hour-lasting measurement in both equally elements.