An Unbiased View of KGW Crystal
Earlier operate confirmed that the dual-crystal configuration can be employed to compensate for the thermal lensing impact[To save lots of this post to your Google Push account, please pick out one or more formats and make sure that you choose to agree to abide by our utilization insurance policies.
Later on, an investigation over the spectral attain curve of Yb:KGW in the primary amplifier is going to be done less than cryogenic temperature evolution from seventy seven K to three hundred K. The Performing temperature will probably be controlled to realize broader obtain bandwidth and less shift within the central wavelength of the main amplifier.
The crimson-shifted part of the SC is of realistic great importance, especially for what fears the effectiveness of broadly tunable optical parametric amplifiers pumped by the elemental harmonics of Yb lasers. The dearth of seed photons within the extensive-wavelength area with the SC spectrum boundaries the amplification efficiency and results in pulse-to-pulse Electricity fluctuations throughout the degeneracy region from the optical parametric amplifier. This factor is quantified in Fig. 6a by plotting the SC spectra in terms of spectral Vitality density, which was approximated by measuring the Strength on the axial part of SC radiation (that's the one virtually practical Portion of SC emission). KGW crystal creates the best spectral Vitality density within the 1200�?450 nm range, as observed within a current study30.
The monoclinic crystal structures results in a pure birefringence, helping to prevent thermally induced polarization rotation and depolarization reduction.
The comparison with glasses is suitable since the huge attain bandwidth lets e.g. tungstate femtosecond lasers and tunable lasers to contend with glass lasers.
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The black line denotes the configuration With all the crystals placed in the same orientation, although the purple line is beneath the configuration of crystals placed in orthogonal orientation.
The particular spectra were being reconstructed by correcting the calculated spectra using an account with the filter transmission features and to the sensitivity capabilities in the spectrometers at the data submit-processing stage. The spectral dynamics in each sample was measured by good tuning the pump pulse energy with a computer-controlled attenuator that was built-in in the laser technique. Thermal Power meter EM (Ophir 3A-PF-twelve) was used to measure the SC Vitality which was thereafter accustomed to work out the spectral energy density in the SC radiation. Every one of the measurements had been carried out with no translation with the sample with respect on the pump beam.
The two-pump laser could present around 120 W electrical power. Somewhere around sixty% of the maximum pump electric power was utilized in our experiment taking into consideration the very low general performance from the dichroic mirrors. Beneath this twin-crystal configuration, our cavity supports a one hundred W pump energy enter, as discussed in Portion 2.two. Large-excellent dichroic mirrors is going to be utilized in the future, and laser pulses are going to be stretched to an extended pulse period.
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The input of the stretcher (incident angle: fifty two°) and that from the compressor incident within the grating have been from the exact same side; that's why, a slight angular tuning of the grating may very well be manufactured to acquire the very best compression final result. Inside the compressor, the enter angle within the grating and the distance concerning more info the interpretation phase (S1) plus the transmission grating (TG) ended up meant to compensate for that stretcher dispersion and all dispersion introduced from the components.
KGW has a strong Raman spectrum that extends with the ultraviolet to your near infrared, rendering it helpful for a range of programs. The crystal may be used to be a reference material for Raman spectroscopy, as well as a sample for learning Raman scattering inside the reliable condition.
Figure four Beam radius variation on the two crystals while transforming the focal length on the thermal lensing impact.
Assembling tungsten oxide hydrate nanocrystal colloids fashioned by laser ablation in liquid into rapidly-reaction electrochromic films.