The smart Trick of KGW Crystal That Nobody is Discussing
The smart Trick of KGW Crystal That Nobody is Discussing
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Past function showed that the twin-crystal configuration can be utilized to compensate for that thermal lensing result[
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Sooner or later, an investigation to the spectral gain curve of Yb:KGW in the principle amplifier will probably be executed below cryogenic temperature evolution from seventy seven K to 300 K. The working temperature might be controlled to appreciate broader acquire bandwidth and fewer shift within the central wavelength of the leading amplifier.
Simultaneously, a shorter laser wavelength may be received; it is possible to operate with a quantum defect properly under 1%. Being a consequence, the warmth generation can be so compact that this partly compensates the decrease thermal conductivity.
-switched method. The bandwidth while in the orthogonal orientation was Plainly Substantially broader. The calculated Fourier transform constrained pulse period was as shorter as sub-one hundred sixty fs. Under the configuration where The 2 crystals ended up placed in precisely the same orientation, Along with the seed input, the amplified pulse bandwidth was only three nm with one hundred eighty μJ Power when it broke the dichroic mirrors.
Amplified pulses with an Vitality earlier mentioned 2.5 mJ might be envisioned by implementing a greater pump electric power towards the regenerative amplifier and which makes it work on the saturation stage. The laser fluence of ~one J/cm2 within the dichroic mirrors is considered to be beneath the injury threshold of higher-high quality dielectric-coated mirrors.
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Ultimately, we investigated the extensive-expression performances of SC era in crystal samples underneath exceptional pumping ailments at larger laser repetition rates. In doing this, the crystal samples were not translated and held in a very stationary posture with regard to the pump beam through the whole measurement. The examples illustrating strong long-term performances of SC technology in KGW and YAG crystals at higher laser repetition charges could possibly be observed somewhere else. Extra particularly, steady functionality of KGW crystal at 2 MHz pulse repetition price under quite equivalent pump beam concentrating geometry was noted recently30, Whilst YAG crystal shown secure effectiveness for numerous hrs at 200 kHz pulse repetition amount Despite really restricted focusing in the pump beam (NA=0.085)32. The very long-phrase performance assessments in LSO, LYSO and YSO discovered gradual narrowing from the SC spectra within the prolonged-wavelength side that happened following a particular exposure time and will be attributed into the optical degradation of these elements. By way of example, in LSO, the onset of spectral narrowing was noticed soon after (sim 20) minutes in a laser repetition fee of 10 kHz, when in a laser repetition price of twenty kHz, secure SC technology general performance was observed just for approximately two min.
The actual spectra read more had been reconstructed by correcting the calculated spectra using an account for that filter transmission capabilities and for the sensitivity capabilities in the spectrometers at the information put up-processing stage. The spectral dynamics in each sample was calculated by high-quality tuning the pump pulse Electricity with a pc-controlled attenuator which was integrated during the laser process. Thermal Electricity meter EM (Ophir 3A-PF-twelve) was used to measure the SC energy which was thereafter utilized to work out the spectral energy density of your SC radiation. The many measurements had been performed with no translation on the sample with regard on the pump beam.
We made a diode-pumped Yb:KGW regenerative amplifier since the front stop from the kilohertz terawatt laser procedure. Broad bandwidth pulses ended up attained by implementing twin crystals with various orientations in their optical axes[
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The enter of your stretcher (incident angle: 52°) Which of your compressor incident on the grating had been in the very same side; that's why, a slight angular tuning of the grating may very well be created to obtain the ideal compression end result. Within the compressor, the enter angle over the grating and the distance concerning the interpretation stage (S1) as well as transmission grating (TG) were being made to compensate with the stretcher dispersion and all dispersion launched via the supplies.
-switched laser output under the two crystal placement configurations. The black line denotes the configuration with the crystals placed in the exact same orientation, when the red line is under the configuration of crystals placed in orthogonal orientation.
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