KGW Crystal Things To Know Before You Buy
KGW Crystal Things To Know Before You Buy
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Preceding do the job showed that the dual-crystal configuration may be used to compensate to the thermal lensing effect[
When ytterbium-doped laser obtain media typically exhibit a small quantum defect, ytterbium-doped tungstates let for specially tiny values. For instance, a 1030-nm Yb:YAG laser would normally be pumped around 940 nm, While Yb:KGW or Yb:KYW could possibly be most efficiently pumped around 981 nm.
Figure 8 Intra-cavity pulse amplification approach monitored by an oscilloscope. The heartbeat underwent an unsaturated amplification due to the mirror hurt limitation.
The main two peaks may very well be affiliated with luminescence of pure material59, even though the remaining peaks might be attributed into the luminescence of unidentified dopants, although the supplier specified the sample as undoped. The luminescence of YAG crystal makes solid UV luminescence using a optimum depth at 300 nm, which happens to be attributed to blended self-trapped exciton and antisite defect-linked emissions60. Ultimately, no luminescence in the UV, seen and in the vicinity of-IR was observed in KGW and LT crystals, a minimum of in the detection number of fiber spectrometer (two hundred�?00 nm).
-switched method. The bandwidth while in the orthogonal orientation was Obviously A great deal broader. The calculated Fourier completely transform minimal pulse duration was as brief as sub-a hundred and sixty fs. Underneath the configuration in which The 2 crystals had been put in the same orientation, Along with the seed input, the amplified pulse bandwidth was only 3 nm with one hundred eighty μJ Strength when it broke the dichroic mirrors.
Amplified pulses using an Electricity above two.five mJ could be envisioned by making use of a better pump electric power to your regenerative amplifier and which makes it do the job on the saturation level. The laser fluence of ~1 J/cm2 to the dichroic mirrors is thought being below the hurt threshold of substantial-quality dielectric-coated mirrors.
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Eventually, we investigated the prolonged-phrase performances of SC era in crystal samples beneath exceptional pumping ailments at greater laser repetition charges. In doing this, the crystal samples were not translated and saved in a very stationary situation with respect into the pump beam through the complete measurement. The illustrations illustrating strong lengthy-expression performances of SC technology in KGW and YAG crystals at higher laser repetition charges might be found in other places. Extra particularly, secure effectiveness of KGW crystal at 2 MHz pulse repetition rate under quite very similar pump beam concentrating geometry was claimed recently30, Whilst YAG crystal shown stable performance for numerous several hours at 200 kHz pulse repetition rate Despite quite limited focusing with the pump beam (NA=0.085)32. The prolonged-expression performance checks in LSO, LYSO and YSO revealed gradual narrowing with the SC spectra within the long-wavelength aspect that transpired immediately after a specific publicity time and could be attributed to your optical degradation of these resources. For instance, in LSO, the onset of spectral narrowing was observed right after (sim 20) minutes in a laser repetition price of 10 kHz, whilst at a laser repetition fee of 20 kHz, steady SC era efficiency was observed just for approximately two min.
The actual spectra were being reconstructed by correcting the measured spectra having an account for the filter transmission functions and for your sensitivity features of your spectrometers at the info put up-processing stage. The spectral dynamics in Each individual sample was calculated by wonderful tuning the pump pulse Electrical power with a computer-controlled attenuator that was built-in while in the laser method. Thermal Strength meter EM (Ophir 3A-PF-12) was utilized to evaluate the SC Strength which was thereafter used to calculate the spectral Electrical power density in the SC radiation. Every one of the measurements have been carried out without any translation of your sample with regard for the pump beam.
Determine four Beam radius variation on The 2 crystals whilst changing the focal length of your thermal lensing effect.
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The input with the stretcher (incident angle: 52°) and that of your compressor incident within the grating ended up from your exact facet; as a result, a slight angular tuning more info of your grating could be manufactured to acquire the very best compression final result. While in the compressor, the enter angle about the grating and the distance in between the interpretation phase (S1) along with the transmission grating (TG) have been designed to compensate for that stretcher dispersion and all dispersion released through the materials.
Because its discovery in 19701,two, the state of the artwork of supercontinuum (SC) generation in bulk reliable-state resources has arrived at a substantial level of maturity owing to remarkable progress of ultrafast laser sources and elementary knowledge of the fundamental physical processes3,4. The complexity of physical effects underlying SC era is unveiled from the framework of femtosecond filamentation, which is a common phenomenon arising from nonlinear propagation of femtosecond laser pulses in transparent materials5. In more functional phrases, the attainable spectral extent of SC radiation depends upon the material Qualities, such as linear and nonlinear indexes of refraction and Electricity bandgap, which along with the laser wavelength define the critical power for self-concentrating (which has to generally be exceeded for a light filament to form) and clamping depth of a lightweight filament (that's proportional for the purchase of multiphoton absorption), respectively.
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KGW crystals are applied as Raman scattering products since they have powerful Raman scattering in a amount of various wavelengths. Any time a laser beam is directed on to the crystal, the photons in the laser beam interact with the crystal lattice, producing many of the photons to scatter in a distinct direction.