Fascination About KGW Crystal
Fascination About KGW Crystal
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Earlier work confirmed that the twin-crystal configuration can be employed to compensate for the thermal lensing impact[
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Figure 8 Intra-cavity pulse amplification approach monitored by an oscilloscope. The heart beat underwent an unsaturated amplification due to mirror injury limitation.
The pink-shifted Section of the SC is of useful importance, specifically for what fears the performance of broadly tunable optical parametric amplifiers pumped by the elemental harmonics of Yb lasers. The dearth of seed photons from the extensive-wavelength area on the SC spectrum limits the amplification effectiveness and brings about pulse-to-pulse energy fluctuations throughout the degeneracy location of your optical parametric amplifier. This component is quantified in Fig. 6a by plotting the SC spectra in terms of spectral energy density, which was approximated by measuring the Electrical power on the axial Section of SC radiation (which is the one nearly useful Component of SC emission). KGW crystal generates the very best spectral Strength density during the 1200�?450 nm vary, as pointed out inside a latest study30.
Its pump laser demands a brief pulse duration, a minimal time jitter, and smooth temporal and spatial distributions due to the intrinsic instantaneous approach. As a result, the OPCPA process is a lot more complicated and highly-priced.
For tungstates, the ytterbium doping focus can be quite high without major quenching since the changed ions have a very equivalent ion radius, as well as the inter-ion length is pretty big.
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Ultimately, we investigated the very long-phrase performances of SC generation in crystal samples under ideal pumping circumstances at better laser repetition prices. In doing this, the crystal samples weren't translated and stored in a very stationary position with respect into the pump beam through the overall measurement. The examples illustrating strong long-phrase performances of SC era in KGW and YAG crystals at substantial laser repetition rates might be uncovered somewhere else. read more Extra precisely, secure overall performance of KGW crystal at 2 MHz pulse repetition amount underneath incredibly very similar pump beam focusing geometry was reported recently30, While YAG crystal shown steady effectiveness for numerous hrs at 200 kHz pulse repetition rate In spite of incredibly restricted concentrating of the pump beam (NA=0.085)32. The extended-expression efficiency assessments in LSO, LYSO and YSO disclosed gradual narrowing of your SC spectra about the prolonged-wavelength side that happened right after a specific publicity time and will be attributed to the optical degradation of such materials. For example, in LSO, the onset of spectral narrowing was observed immediately after (sim twenty) minutes at a laser repetition rate of ten kHz, while at a laser repetition rate of twenty kHz, secure SC technology performance was observed just for roughly two min.
Thermal results are considerably smaller in KGW. This combined with the substantial destruction threshold make the crystal a superb applicant for ability scaling. Comparing Ba(NO3)2 and KGW for Raman software Ba(NO3)2 are simpler in case of ns pulses and KGW �?in case of ps pulses.
The threshold Electricity for SC generation (hbox E _ textrm th ) was outlined as the pump pulse Vitality, where by the blue-shifted spectral broadening rapidly settles to a particular Slash-off wavelength That continues to be Just about constant Despite even further increase on the pump pulse Power. The ideal Strength (hbox E _textrm decide ), was defined because the pump pulse Strength, which provides the largest red-shifted spectral broadening prior to the onset of periodic modulation while in the SC spectrum as a consequence 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）
-switched laser output under the two crystal placement configurations. The black line denotes the configuration with the crystals put in the same orientation, while the pink line is underneath the configuration of crystals positioned in orthogonal orientation.
The scattered photons have a special wavelength and Vitality compared to the incident photons, which makes a Raman spectrum.
]. The dual-crystal configuration lowers the thermal load on Every crystal whilst protecting a higher achieve, and facilitates the compensation of every one’s thermal lensing result. Therefore, the laser cavity can perform with a considerable stability assortment more than the thermal lensing influence variation.