Not known Facts About KGW Crystal
Not known Facts About KGW Crystal
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In the future, an investigation around the spectral acquire curve of Yb:KGW in the key amplifier will probably be carried out beneath cryogenic temperature evolution from 77 K to 300 K. The Performing temperature will probably be controlled to comprehend broader obtain bandwidth and less change on the central wavelength of the primary amplifier.
Therefore There exists little flexibility for optimizing the dispersion payment result. Sub-two hundred fs pulses is often envisioned using a broader bandwidth seed enter. Thanks to the dual-crystal configuration, the laser cavity delivers a near diffraction confined laser beam with M
-switched method. The bandwidth during the orthogonal orientation was Evidently Substantially broader. The calculated Fourier completely transform limited pulse duration was as small as sub-160 fs. Underneath the configuration where by The 2 crystals had been positioned in the exact same orientation, While using the seed input, the amplified pulse bandwidth was only 3 nm with 180 μJ Electrical power when it broke the dichroic mirrors.
Right before the event of Nd:YAG, Nd3+:CaWO4 was a vital rare-earth-doped laser attain medium. It had been in actual fact used in the primary repeatedly running crystal laser.
Sooner or later, we will undertake a laser seed which has a broader spectral bandwidth and apply an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to make comprehensive use on the gain bandwidth of our regenerative amplifier.
Finally, we investigated the long-expression performances of SC technology in crystal samples below best pumping disorders at higher laser repetition premiums. In doing so, the crystal samples were not translated and kept in the stationary placement with respect to the pump beam through the full measurement. The illustrations illustrating robust extended-phrase performances of SC technology in KGW and YAG crystals at significant laser repetition costs could possibly be observed in other places. Far more exclusively, secure performance of KGW crystal at two MHz pulse repetition amount less than quite related pump beam concentrating geometry was reported recently30, While YAG crystal demonstrated stable effectiveness for numerous hrs at 200 kHz pulse repetition amount In spite of extremely restricted concentrating with the pump beam (NA=0.085)32. The extended-term efficiency checks in LSO, LYSO and YSO exposed gradual narrowing with the SC spectra on the long-wavelength side that happened soon after a certain publicity time and will be attributed to your optical degradation of these supplies. As an illustration, in LSO, the onset of spectral narrowing was observed immediately after (sim 20) minutes in a laser repetition price of 10 kHz, when at a laser repetition fee of twenty kHz, steady SC generation functionality was observed just for approximately 2 min.
As a result, with an extra advancement within our regenerative amplifier, 2 mJ compressed pulses might be anticipated, without harmful any component inside our compressor.
The red-shifted Component of the SC spectrum in BGO has the lowest spectral Electricity density, which happens to be one–two orders of magnitude decreased than in the rest of the components. Nevertheless, extremely small energy threshold of SC technology, and also small optimum pump Vitality in BGO, should be pointed out. The believed spectral Power densities produced in LSO and LYSO are quite just like YAG through the entire main part of the SC spectrum. One of the most appealing acquiring in that regard is GGG crystal, which, Inspite of quite moderate blue-shifted spectral broadening, produces the most important spectral red-shift and the very best spectral Strength density from the 1600�?000 nm array, which is sort of an buy of magnitude better than that developed in YAG.
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）
Tungstates are inclined to own higher Raman coefficients (�?Raman scattering). As a result, they might produce significant Raman more info obtain at average optical intensities. It is feasible to utilize the laser crystal by itself as being a Raman converter.
Figure 8 Intra-cavity pulse amplification method monitored by an oscilloscope. The pulse underwent an unsaturated amplification because of the mirror hurt limitation.
An example of this sort of conduct is revealed in Fig. 7a. The character of spectral adjustments is highlighted in Fig. 7d, which shows how the SC spectrum to the lengthy-wavelength facet shrinks considerably, from 1800 nm to 1450 nm, just just after 8 minutes of publicity time inside of a stationary sample. LT crystal demonstrated fairly improved prolonged-expression effectiveness: at pulse repetition prices of as many as 100 kHz no narrowing on either side of the SC spectrum was detected. Even so, rapid narrowing in the SC spectrum in LT crystal was observed right after the very first five minutes of operation when the heartbeat repetition level was established at 200 kHz (information not shown). In distinction to the above products, BGO and GGG shown exceptional SC technology performances without any spectral alterations at a pulse repetition fee of 200 kHz, as attested by the point number of SC spectra in BGO and GGG, proven in Fig. 7b and c, respectively. Determine 7e and file define similar shapes of SC spectra in the beginning and at the end of 1 hour-lasting measurement in equally materials.