The best Side of KGW Crystal
The best Side of KGW Crystal
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Figure 8 Intra-cavity pulse amplification course of action monitored by an oscilloscope. The pulse underwent an unsaturated amplification due to mirror injury limitation.
In summary, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are successful nonlinear products for broadband SC technology within the close to-infrared and brief-wave infrared spectral ranges, when pumped by 180 fs fundamental harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO produced two octave-spanning SC spectra, which Look at to SC spectra manufactured in YAG. These elements show rather very similar performances to YAG also in terms of threshold and best pump pulse energies for SC generation. Having said that, for what worries the possibility to function at higher laser pulse repetition level, YSO, LSO and LYSO exhibit tough Procedure only at 10 kHz and rapidly degrade (inside a couple of minutes) at 20 kHz. Moreover the reasonably very low SC generation threshold (169 nJ), GGG demonstrated outstanding overall performance qualities from the limited-wave infrared with the optimum pump pulse Strength of 464 nJ, and that is two occasions reduced than in YAG: the most important red-shifted spectral broadening and the highest spectral energy density, outperforming KGW and YAG crystals in that aspect.
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]. Etalon insertion would bring on further decline, even so, time-to-time optimization would introduce the risk of component problems and instability on the system. A nonlinear regenerative amplifier could specifically deliver pulses using a period as little as 97 fs in addition to a spectral bandwidth of 19 nm[
Down the road, We'll adopt a laser seed which has a broader spectral bandwidth and implement an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to create comprehensive use on the gain bandwidth of our regenerative amplifier.
Finally, we investigated the long-term performances of SC technology in crystal samples underneath best pumping disorders at larger laser repetition charges. In doing so, the crystal samples weren't translated and held inside a stationary position with regard to the pump beam throughout the full measurement. The examples illustrating robust very long-phrase performances of SC technology in KGW and YAG crystals at superior laser repetition rates could be located elsewhere. Far more specifically, steady performance of KGW crystal at two MHz pulse repetition fee under really identical pump beam focusing geometry was noted recently30, While YAG crystal shown steady efficiency for several hrs at two hundred kHz pulse repetition amount Despite really limited focusing in the pump beam (NA=0.085)32. The long-term efficiency exams in LSO, LYSO and YSO unveiled gradual narrowing on the SC spectra to the very long-wavelength facet that transpired soon after a particular exposure time and will be attributed on the optical degradation of those supplies. For instance, in LSO, the onset of spectral narrowing was observed after (sim twenty) minutes at a laser repetition level of 10 kHz, whilst in a laser repetition level of 20 kHz, secure SC generation performance was noticed just for roughly 2 min.
We plan to boost the pulse Strength to higher than forty mJ in two-phase multi-move amplifiers, comparable to a gain factor of 20. In Just about every amplifier, we can even undertake two cascaded crystals positioned beneath orthogonal orientation to lessen the thermal load on Each individual crystal and compensate with the gain-narrowing impact.
The two-pump laser could present around a hundred and twenty W electricity. Roughly 60% of the most pump electrical power was used in our experiment thinking of the reduced effectiveness from the dichroic mirrors. Beneath this twin-crystal configuration, our cavity supports a a hundred W pump energy enter, as talked over in Segment 2.2. Substantial-high-quality dichroic mirrors will probably be employed Sooner or later, and laser pulses are going to be stretched to a longer pulse duration.
相关工作得到了上海扬帆计划、国家重点研发计划、中国科学院战略性先导科技专项、国家自然科学基金项目、上海市优秀学术/技术带头人计划、上海市市级科技重大专项、中国科学院青年创新促进会的支持。（强场激光物理国家重点实验室供稿）
The Yb:KGW laser process features a quasi-3-amount behavior. The net obtain with the Yb:KGW crystal wasn't large: various tens of roundtrips were being needed to amplify the nanojoule seed to some millijoule degree. Consequently, the gain-narrowing effect was inescapable in Yb:KGW regenerative amplifiers.
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Both equally energies are marked from the dashed traces as well as their values are labeled in the plots. The equivalent characteristics have been also noticed in KGW and YAG crystals, whose spectral broadening dynamics here are revealed to get a comparison in Fig. 4.