Facts About KGW Crystal Revealed
Facts About KGW Crystal Revealed
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The obtain bandwidth e.g. of Yb:KGW and Yb:KYW is extremely large in contrast with that of Yb:YAG. This permits for broad wavelength tunability and for A lot shorter pulse durations from method-locked lasers. Values nicely down below one hundred fs are actually reached with passive mode locking.
The red-shifted A part of the SC is of practical significance, especially for what fears the functionality of broadly tunable optical parametric amplifiers pumped by the basic harmonics of Yb lasers. The dearth of seed photons within the lengthy-wavelength location with the SC spectrum restrictions the amplification effectiveness and ends in pulse-to-pulse Strength fluctuations throughout the degeneracy area in the optical parametric amplifier. This facet is quantified in Fig. 6a by plotting the SC spectra in terms of spectral Power density, which was believed by measuring the Electricity on the axial Section of SC radiation (that's the sole virtually practical Section of SC emission). KGW crystal generates the highest spectral Vitality density in the 1200�?450 nm selection, as mentioned inside of a modern study30.
], but it might increase much more Expense to this component. The intra-cavity spectral achieve curve could possibly be modulated by inserting an etalon that reduces the particular attain at the wavelength with the most get component[
Amplified pulses by having an energy over 2.five mJ is usually expected by making use of an increased pump energy on the regenerative amplifier and which makes it get the job done at the saturation amount. The laser fluence of ~1 J/cm2 around the dichroic mirrors is considered to be under the problems threshold of high-quality dielectric-coated mirrors.
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Finally, we investigated the lengthy-expression performances of SC era in crystal samples beneath ideal pumping problems at better laser repetition fees. In doing this, the crystal samples were not translated and stored in a very stationary position with respect on the pump beam through the entire measurement. The illustrations illustrating sturdy extensive-expression performances of SC technology in KGW and YAG crystals at substantial laser repetition rates may be uncovered elsewhere. Far more precisely, steady effectiveness of KGW crystal at two MHz pulse repetition level under really identical pump click here beam concentrating geometry was described recently30, Whilst YAG crystal demonstrated steady functionality for numerous hours at 200 kHz pulse repetition charge Despite extremely limited concentrating from the pump beam (NA=0.085)32. The extended-term general performance tests in LSO, LYSO and YSO disclosed gradual narrowing with the SC spectra to the extensive-wavelength facet that occurred soon after a particular exposure time and will be attributed to your optical degradation of these products. By way of example, in LSO, the onset of spectral narrowing was observed immediately after (sim 20) minutes at a laser repetition amount of ten kHz, even though in a laser repetition charge of 20 kHz, secure SC era overall performance was observed just for roughly 2 min.
The actual spectra have been reconstructed by correcting the measured spectra by having an account for your filter transmission capabilities and with the sensitivity functions of the spectrometers at the information publish-processing phase. The spectral dynamics in Just about every sample was measured by good tuning the pump pulse Electrical power with a computer-managed attenuator which was integrated while in the laser system. Thermal Strength meter EM (Ophir 3A-PF-twelve) was used to evaluate the SC Electrical power which was thereafter used to compute the spectral Electrical power density on the SC radiation. Every one of the measurements were carried out with none translation from the sample with regard to the pump beam.
We created a diode-pumped Yb:KGW regenerative amplifier as being the entrance end of the kilohertz terawatt laser procedure. Wide bandwidth pulses ended up obtained by implementing twin crystals with different orientations in their optical axes[
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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