The smart Trick of KGW Crystal That Nobody is Discussing
The smart Trick of KGW Crystal That Nobody is Discussing
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The gain bandwidth e.g. of Yb:KGW and Yb:KYW may be very significant when compared with that of Yb:YAG. This enables for broad wavelength tunability and for Substantially shorter pulse durations from method-locked lasers. Values properly below 100 fs have already been achieved with passive manner locking.
For that reason there is minor liberty for optimizing the dispersion compensation outcome. Sub-200 fs pulses is often predicted by using a broader bandwidth seed input. Because of the twin-crystal configuration, the laser cavity provides a close to diffraction constrained laser beam with M
Its pump laser demands a short pulse length, a lower time jitter, and easy temporal and spatial distributions because of the intrinsic instantaneous system. Thus, the OPCPA program is much more complex and highly-priced.
Amplified pulses with an energy higher than 2.five mJ may be expected by making use of a better pump electricity on the regenerative amplifier and making it get the job done in the saturation degree. The laser fluence of ~one J/cm2 on the dichroic mirrors is thought for being beneath the injury threshold of significant-quality dielectric-coated mirrors.
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The black line denotes the configuration Together with the crystals put in precisely the same orientation, whilst the purple line is beneath the configuration of crystals positioned in orthogonal orientation.
]. This method was determined by the fact that the spectral emission cross-part curves vary from one another when laser polarization is paralleled to the various optical axis of Yb-doped double tungstates[
The brink Power for SC generation (hbox E _ textrm th ) was described as being the pump pulse Vitality, in which the blue-shifted spectral broadening quickly settles to a specific Minimize-off wavelength That is still Just about consistent Despite more boost on the pump pulse Strength. The optimum Electrical power (hbox E _textrm decide ), was outlined as being the pump pulse Electrical power, which produces the biggest red-shifted spectral broadening before the onset of periodic modulation from the SC spectrum on account of filament refocusing.
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 on the compressor incident with the grating have been through the same side; hence, a slight angular tuning of your grating can be built to acquire the ideal compression consequence. From the compressor, the input angle within the grating and the distance between the interpretation stage (S1) and also the transmission grating (TG) were being built to compensate for your stretcher dispersion and all dispersion introduced because of the products.
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Figure 8 Intra-cavity pulse amplification process monitored by an oscilloscope. The heartbeat underwent an unsaturated amplification due to mirror destruction limitation.
]. The twin-crystal configuration lowers the thermal load on each crystal although protecting a higher achieve, and facilitates the payment of each one’s thermal lensing impact. Thus, the laser cavity can work with get more info a big security vary more than the thermal lensing result variation.