An Unbiased View of KGW Crystal
An Unbiased View of KGW Crystal
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Sooner or later, an investigation about the spectral get curve of Yb:KGW in the most crucial amplifier will likely be carried out below cryogenic temperature evolution from seventy seven K to three hundred K. The Doing the job temperature will be managed to understand broader obtain bandwidth and less shift at the central wavelength of the leading amplifier.
The purple-shifted part of the SC is of realistic significance, specifically for what problems the overall performance of broadly tunable optical parametric amplifiers pumped by the fundamental harmonics of Yb lasers. The shortage of seed photons in the prolonged-wavelength area of your SC spectrum boundaries the amplification effectiveness and brings about pulse-to-pulse Electricity fluctuations throughout the degeneracy location in the optical parametric amplifier. This element is quantified in Fig. 6a by plotting the SC spectra concerning spectral energy density, which was approximated by measuring the Strength of the axial part of SC radiation (which can be the only practically practical Section of SC emission). KGW crystal creates the highest spectral energy density while in the 1200�?450 nm variety, as famous inside of a recent study30.
In distinction, the seed laser is usually amplified to more than one mJ underneath the orthogonal orientation configuration.
]. Etalon insertion would produce supplemental reduction, however, time-to-time optimization would introduce the chance of element destruction and instability towards the technique. A nonlinear regenerative amplifier could straight provide pulses having a period as little as 97 fs as well as a spectral bandwidth of 19 nm[
Another was put with its Np -axis parallel Using the s-polarized course. A comparison was produced involving a configuration With all the crystals put in the same orientation (
The mixed attain is complex and will be calculated below distinct pumping problems due to the quasi-3-level process behavior on the Yb-doped attain medium. The blueshift, with one peak from 1037 nm under the similar crystal placement orientation to 1035 nm underneath the orthogonal crystal placement orientation, could result from your reabsorption losses at a lengthy wavelength within the crystal in which the laser polarization is parallel to its Nm -axis, earning the gain at 1035 nm bigger than that at 1037 nm under orthogonal orientation.
The actual spectra had been reconstructed by correcting the measured spectra with the account with the filter transmission capabilities and to the sensitivity capabilities with the spectrometers at the info post-processing stage. The spectral dynamics in Each and every sample was measured by high-quality tuning the pump pulse Electrical power with a pc-controlled attenuator that was built-in while in the click here laser procedure. Thermal Power meter EM (Ophir 3A-PF-12) was accustomed to evaluate the SC Power which was thereafter utilized to work out the spectral Strength density on the SC radiation. All of the measurements were being carried out without any translation of your sample with respect towards the pump beam.
The brink Electrical power for SC technology (hbox E _ textrm th ) was defined because the pump pulse Vitality, where the blue-shifted spectral broadening quickly settles to a particular Minimize-off wavelength that remains Just about continuous Despite having additional enhance of the pump pulse Electricity. The optimum Vitality (hbox E _textrm decide ), was defined as being the pump pulse energy, which creates the biggest purple-shifted spectral broadening before the onset of periodic modulation inside the SC spectrum on account of filament refocusing.
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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Assembling tungsten oxide hydrate nanocrystal colloids formed by laser ablation in liquid into fast-reaction electrochromic films.