The KGW Crystal Diaries
The KGW Crystal Diaries
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]. A result of the limited storage time, Ti:sapphire is usually pumped by frequency-doubled Nd:YAG or Nd:glass reliable-state lasers, which results in a bulky and complicated process with high Price tag. When compared with traditional CPA laser units, the OPCPA technique can obtain a shorter pulse duration and a greater peak energy.
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The achieve bandwidth e.g. of Yb:KGW and Yb:KYW may be very huge as opposed with that of Yb:YAG. This enables for large wavelength tunability and for Considerably shorter pulse durations from method-locked lasers. Values effectively down below one hundred fs have already been achieved with passive mode locking.
Figure 7 displays the calculated dispersion compensation consequence. The compressed pulse length is close to 185 fs in the event the period of input pulses is 150 fs. The discrepancy in between them might be considerably lessened with a longer pulse enter due to the fact uncompensated substantial-get dispersion issues considerably less for extended pulses. This configuration was utilized to show the compressibility of our amplified pulses within the preliminary period of our entire technique. Sooner or later we might undertake a grating-pair compressor for fine compensation for high-purchase dispersion.
-switched mode. The bandwidth inside the orthogonal orientation was Plainly Considerably broader. The calculated Fourier completely transform constrained pulse length was as short as sub-a hundred and sixty fs. Beneath the configuration in which the two crystals were being positioned in exactly the same orientation, With all the seed enter, the amplified pulse bandwidth was only three nm with 180 μJ Electricity when it broke the dichroic mirrors.
Right before the event of Nd:YAG, Nd3+:CaWO4 was a vital unusual-earth-doped laser get medium. It was in fact Employed in the primary constantly working crystal laser.
In the future, we will adopt a laser seed having a broader spectral bandwidth and use an acousto-optical programmable dispersive filter to modulate the seed’s spectrum for making whole use on the achieve bandwidth of our regenerative amplifier.
Finally, we investigated the prolonged-term performances of SC technology in crystal samples under ideal pumping conditions at better laser repetition charges. In doing so, the crystal samples weren't translated and stored inside of a stationary situation with respect on the pump beam read more throughout the overall measurement. The illustrations illustrating robust very long-time period performances of SC era in KGW and YAG crystals at large laser repetition fees could possibly be uncovered elsewhere. A lot more exclusively, secure functionality of KGW crystal at two MHz pulse repetition charge less than extremely very similar pump beam focusing geometry was noted recently30, whereas YAG crystal demonstrated secure overall performance for numerous hrs at two hundred kHz pulse repetition level even with really tight focusing on the pump beam (NA=0.085)32. The very long-time period performance exams in LSO, LYSO and YSO uncovered gradual narrowing with the SC spectra over the extensive-wavelength facet that happened after a specific publicity time and will be attributed into the optical degradation of such materials. As an example, in LSO, the onset of spectral narrowing was noticed immediately after (sim twenty) minutes in a laser repetition price of 10 kHz, whilst in a laser repetition level of twenty kHz, steady SC generation overall performance was noticed just for roughly 2 min.
The actual spectra were reconstructed by correcting the calculated spectra with the account with the filter transmission features and for the sensitivity features of the spectrometers at the information post-processing stage. The spectral dynamics in Just about every sample was measured by great tuning the pump pulse Vitality with a pc-controlled attenuator which was integrated in the laser system. Thermal Strength meter EM (Ophir 3A-PF-12) was accustomed to measure the SC Strength which was thereafter used to compute the spectral Electrical power density in the SC radiation. All of the measurements ended up executed without any translation on the sample with regard to the pump beam.
The pink-shifted Portion of the SC spectrum in BGO has the bottom spectral energy density, that is one–2 orders of magnitude lower than in the remainder of the resources. Nevertheless, incredibly small Power threshold of SC technology, together with small optimum pump energy in BGO, ought to be identified. The believed spectral energy densities manufactured in LSO and LYSO are fairly just like YAG through the key Section of the SC spectrum. By far the most attention-grabbing obtaining in that regard is GGG crystal, which, despite quite reasonable blue-shifted spectral broadening, creates the most important spectral pink-change and the very best spectral energy density within the 1600�?000 nm assortment, which is almost an buy of magnitude better than that produced 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）
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