Not known Facts About KGW Crystal
Not known Facts About KGW Crystal
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]. Mainly because of the brief storage time, Ti:sapphire is often pumped by frequency-doubled Nd:YAG or Nd:glass reliable-point out lasers, which results in a bulky and complicated technique with large cost. In comparison with common CPA laser units, the OPCPA technique can receive a shorter pulse period and a greater peak electricity.
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The crimson-shifted part of the SC is of functional value, especially for what considerations the overall performance of broadly tunable optical parametric amplifiers pumped by the basic harmonics of Yb lasers. The lack of seed photons while in the very long-wavelength area of the SC spectrum boundaries the amplification efficiency and ends in pulse-to-pulse Electrical power fluctuations within the degeneracy area in the optical parametric amplifier. This part is quantified in Fig. 6a by plotting the SC spectra concerning spectral Electricity density, which was believed by measuring the Strength in the axial Component of SC radiation (which is the only real virtually helpful Component of SC emission). KGW crystal produces the best spectral Electricity density within the 1200�?450 nm selection, as pointed out in a very recent study30.
], but it would increase much more Expense to this element. The intra-cavity spectral obtain curve could possibly be modulated by inserting an etalon that decreases the actual acquire with the wavelength with the maximum achieve aspect[
]. Etalon insertion would lead to extra decline, having said that, time-to-time optimization would introduce the potential risk of component hurt and instability for the method. A nonlinear regenerative amplifier could directly deliver pulses which has a length as little as 97 fs and also a spectral bandwidth of 19 nm[
Sooner or later, We're going to adopt a laser seed which has a broader spectral bandwidth and use an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to produce entire use on the achieve bandwidth of our regenerative amplifier.
Lastly, we investigated the very long-term performances of SC era in crystal samples less than optimum pumping disorders at larger laser repetition prices. In doing this, the crystal samples were not translated and kept in a very stationary placement with regard on the pump beam throughout the overall measurement. The examples illustrating sturdy extensive-phrase performances of SC technology in KGW and YAG crystals at large laser repetition fees may very well be uncovered elsewhere. A lot more exclusively, secure overall performance of KGW crystal at 2 MHz pulse repetition fee less than very comparable pump beam focusing geometry was documented recently30, While YAG crystal shown secure performance for several hours at 200 kHz pulse repetition charge In spite of incredibly limited concentrating of your pump beam (NA=0.085)32. The long-time period performance tests in LSO, LYSO and YSO revealed gradual narrowing of your SC spectra around the prolonged-wavelength aspect that transpired immediately after a specific publicity time and could be attributed for the optical degradation of those supplies. As an example, in LSO, the onset of spectral narrowing was observed following (sim twenty) minutes in a laser repetition amount of ten kHz, when at a laser repetition amount of twenty kHz, secure SC generation general performance was observed just for approximately two min.
The particular spectra were being reconstructed by correcting the measured spectra with an account with the filter transmission features and to the sensitivity functions of your spectrometers at the information publish-processing stage. The spectral dynamics in each sample was measured by good tuning the pump pulse Electrical power with a computer-managed attenuator which was integrated while in the laser process. Thermal Electricity meter EM (Ophir 3A-PF-twelve) was utilized to measure the SC Electrical power which was thereafter utilized to work out the spectral Power density on the SC radiation. All of the measurements had been done with website none translation of your sample with regard for the pump beam.
The brink Vitality for SC technology (hbox E _ textrm th ) was defined because the pump pulse Strength, the place the blue-shifted spectral broadening promptly settles to a certain Minimize-off wavelength That is still Practically constant Despite having further raise on the pump pulse energy. The ideal Strength (hbox E _textrm opt ), was outlined given that the pump pulse energy, which generates the largest purple-shifted spectral broadening prior to the onset of periodic modulation inside the SC spectrum resulting from 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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Determine eight Intra-cavity pulse amplification procedure monitored by an oscilloscope. The heart beat underwent an unsaturated amplification as a result of mirror damage limitation.
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