The smart Trick of KGW Crystal That No One is Discussing
The smart Trick of KGW Crystal That No One is Discussing
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The thermal conductivity of widespread double tungstates is of your get to 3–4 W/(K m) �?which isn't poor when compared with other laser crystals (Even though numerous periods less than for YAG), and reasonably massive as opposed Using the thermal conductivity of standard glasses.
The obtain bandwidth e.g. of Yb:KGW and Yb:KYW may be very massive in comparison with that of Yb:YAG. This allows for extensive wavelength tunability and for Considerably shorter pulse durations from manner-locked lasers. Values well below a hundred fs happen to be reached with passive manner locking.
Hence You can find tiny freedom for optimizing the dispersion payment effect. Sub-two hundred fs pulses might be envisioned that has a broader bandwidth seed input. Thanks to the twin-crystal configuration, the laser cavity provides a in the vicinity of diffraction minimal laser beam with M
], but it might add much more Price tag to this part. The intra-cavity spectral obtain curve could be modulated by inserting an etalon that lessens the actual achieve at the wavelength with the utmost gain variable[
]. Etalon insertion would result in more reduction, on the other hand, time-to-time optimization would introduce the potential risk of element injury and instability to your technique. A nonlinear regenerative amplifier could instantly supply pulses that has a length as little as ninety seven fs and a spectral bandwidth of 19 nm[
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Ultimately, we investigated the extensive-phrase performances of SC technology in crystal samples beneath optimal pumping ailments at larger laser repetition premiums. In doing so, the crystal samples weren't translated and kept within a stationary situation with regard for the pump beam in the course of the full measurement. The examples illustrating strong extensive-phrase performances of SC get more info generation in KGW and YAG crystals at superior laser repetition costs could be uncovered in other places. Additional especially, secure overall performance of KGW crystal at 2 MHz pulse repetition charge beneath incredibly very similar pump beam focusing geometry was described recently30, whereas YAG crystal demonstrated steady functionality for numerous hours at two hundred kHz pulse repetition price Despite really limited concentrating from the pump beam (NA=0.085)32. The extended-time period functionality tests in LSO, LYSO and YSO discovered gradual narrowing of the SC spectra about the prolonged-wavelength side that occurred just after a specific exposure time and could be attributed for the optical degradation of such components. For illustration, in LSO, the onset of spectral narrowing was noticed immediately after (sim 20) minutes in a laser repetition rate of ten kHz, although at a laser repetition rate of twenty kHz, steady SC generation general performance was observed just for approximately two min.
The actual spectra were being reconstructed by correcting the measured spectra with an account to the filter transmission capabilities and with the sensitivity functions with the spectrometers at the data publish-processing stage. The spectral dynamics in Every single sample was calculated by good tuning the pump pulse Power with a computer-controlled attenuator that was built-in within the laser process. Thermal energy meter EM (Ophir 3A-PF-twelve) was accustomed to measure the SC Power which was thereafter used to determine the spectral energy density of your SC radiation. Many of the measurements had been done with no translation with the sample with respect to your pump beam.
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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）
The Yb:KGW laser technique has a quasi-a few-degree conduct. The net get in the Yb:KGW crystal was not superior: several tens of roundtrips ended up necessary to amplify the nanojoule seed to the millijoule stage. Hence, the acquire-narrowing outcome was unavoidable in Yb:KGW regenerative amplifiers.
Outcome of potassium supplementation on vascular purpose: A meta-analysis of randomized managed trials.
Both equally energies are marked through the dashed lines as well as their values are labeled within the plots. The identical options were being also observed in KGW and YAG crystals, whose spectral broadening dynamics are demonstrated for just a comparison in Fig. four.