The KGW Crystal Diaries
The KGW Crystal Diaries
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In the future, an investigation on the spectral get curve of Yb:KGW in the key amplifier will be done beneath cryogenic temperature evolution from seventy seven K to three hundred K. The Doing work temperature will be managed to comprehend broader acquire bandwidth and fewer shift on the central wavelength of the key amplifier.
Simultaneously, a shorter laser wavelength could be obtained; it is achievable to function using a quantum defect nicely underneath 1%. To be a consequence, the heat technology might be so compact that this partly compensates the lower thermal conductivity.
Alternative on the Computer for a greater one or even a good adjustment on the Personal computer orientation as well as the utilized higher voltage is needed to prevent this phenomenon. A quick pulse picker may be used to Increase the nanosecond-scale distinction of your output major pulse.
For tungstates, the ytterbium doping focus can be quite significant without the need of significant quenching as the changed ions have a very similar ion radius, and also the inter-ion distance is comparatively massive.
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The black line denotes the configuration With all the crystals put in precisely the same orientation, while the red line is under the configuration of crystals placed in orthogonal orientation.
The actual spectra were being reconstructed by correcting the measured spectra having an account for your filter transmission capabilities and for your sensitivity capabilities from the spectrometers at the info publish-processing phase. The spectral dynamics in Every sample was calculated by fine tuning the pump pulse Electrical power with a computer-managed attenuator which was integrated inside the laser process. Thermal energy meter EM (Ophir 3A-PF-12) was utilized to evaluate the SC Power which was thereafter accustomed to work out the spectral Vitality density with the SC radiation. All the measurements had been done with none translation of your sample with respect on the pump beam.
We designed a diode-pumped Yb:KGW regenerative amplifier given that the entrance close in the kilohertz terawatt laser process. Wide bandwidth pulses ended up acquired by making use of dual crystals with unique orientations of their optical axes[
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The input of the stretcher (incident angle: fifty two°) Which with the compressor incident for the grating ended up within the similar facet; for this reason, a slight angular tuning with the grating may very well be built to acquire the best compression final result. While in the compressor, the enter angle within the grating and the gap between the interpretation phase (S1) as well as the transmission grating (TG) have been designed to compensate for your stretcher dispersion and all dispersion launched via the elements.
Considering the fact that its discovery in 19701,2, the point out of your artwork of supercontinuum here (SC) generation in bulk sound-point out components has reached a higher volume of maturity because of tremendous progress of ultrafast laser resources and basic idea of the fundamental physical processes3,four. The complexity of physical results underlying SC generation is unveiled in the framework of femtosecond filamentation, which can be a common phenomenon arising from nonlinear propagation of femtosecond laser pulses in transparent materials5. In additional simple terms, the attainable spectral extent of SC radiation depends upon the material Homes, for instance linear and nonlinear indexes of refraction and Vitality bandgap, which together with the laser wavelength determine the vital energy for self-concentrating (which has to get exceeded for a lightweight filament to kind) and clamping depth of a light filament (that's proportional towards the get of multiphoton absorption), respectively.
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An illustration of these behaviour is shown in Fig. 7a. The character of spectral changes is highlighted in Fig. 7d, which reveals how the SC spectrum to the extended-wavelength aspect shrinks significantly, from 1800 nm to 1450 nm, just just after eight minutes of publicity time inside a stationary sample. LT crystal demonstrated rather far better extended-expression overall performance: at pulse repetition costs of around one hundred kHz no narrowing on either side of the SC spectrum was detected. Having said that, speedy narrowing on the SC spectrum in LT crystal was observed immediately after the very first five minutes of Procedure when the heartbeat repetition amount was established at two hundred kHz (information not proven). In contrast to the above products, BGO and GGG demonstrated outstanding SC technology performances with no spectral changes at a pulse repetition rate of 200 kHz, as attested by the point number of SC spectra in BGO and GGG, shown in Fig. 7b and c, respectively. Determine 7e and file outline identical styles of SC spectra originally and at the conclusion of one hour-lasting measurement in each materials.