An Unbiased View of KGW Crystal
An Unbiased View of KGW Crystal
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For some programs, tungstates offer a mix of many handy Homes. Specifically for passive method locking, ytterbium-doped double tungstates are often excellent to other media when it comes to the combination of significant attain bandwidth, massive cross-sections, and relatively fantastic thermal Qualities �?even though in Every single unique willpower better components may be located.
Hence There exists minimal independence for optimizing the dispersion payment impact. Sub-200 fs pulses might be envisioned which has a broader bandwidth seed enter. Because of the twin-crystal configuration, the laser cavity provides a close to diffraction confined laser beam with M
-switched method. The bandwidth from the orthogonal orientation was Evidently Significantly broader. The calculated Fourier rework constrained pulse length was as quick as sub-160 fs. Under the configuration where by The 2 crystals ended up put in a similar orientation, With all the seed enter, the amplified pulse bandwidth was only three nm with 180 μJ energy when it broke the dichroic mirrors.
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Another was put with its Np -axis parallel Together with the s-polarized direction. A comparison was produced concerning a configuration With all the crystals placed in exactly the same orientation (
The black line denotes the configuration with the crystals placed in exactly the same orientation, when the purple line is underneath the configuration of crystals put in orthogonal orientation.
The particular spectra have been reconstructed by correcting the calculated spectra with the account for your filter transmission capabilities and for the sensitivity features of your spectrometers at the data post-processing phase. The spectral dynamics in Just about every sample was calculated by wonderful tuning the pump pulse Vitality with a computer-controlled attenuator that was integrated during the laser technique. Thermal Power meter EM (Ophir 3A-PF-twelve) was utilized to measure the SC Electrical power which was thereafter accustomed to work out the spectral Electricity density from the SC radiation. Many of the measurements had been carried out with no translation with the sample with respect to the pump beam.
The edge Strength for SC era (hbox E _ textrm th ) was described because the pump pulse Electricity, the place the blue-shifted spectral broadening immediately settles to a certain click here Reduce-off wavelength that remains Nearly constant Despite more improve from the pump pulse energy. The ideal energy (hbox E _textrm choose ), was described given that the pump pulse Vitality, which provides the most important purple-shifted spectral broadening before the onset of periodic modulation inside the SC spectrum due to filament refocusing.
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-switched laser output underneath the two crystal placement configurations. The black line denotes the configuration With all the crystals placed in the same orientation, when the crimson line is beneath the configuration of crystals placed in orthogonal orientation.
Figure 8 Intra-cavity pulse amplification system monitored by an oscilloscope. The heart beat underwent an unsaturated amplification due to the mirror problems limitation.
The two energies are marked because of the dashed traces and their values are labeled in the plots. The equivalent options ended up also observed in KGW and YAG crystals, whose spectral broadening dynamics are revealed for the comparison in Fig. four.