KYW Crystal - An Overview
KYW Crystal - An Overview
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The Yb-doped potassium yttrium tungstate (Yb:KYW) crystal, in comparison with its counterpart Yb:KGW, is often a remarkable materials that plays a vital function in laser technological innovation. Its Most important function would be to produce ultrashort pulses of sunshine, spanning just a few hundred femtoseconds.
Femtosecond laser based upon Yb:KYW crystals with suppression of spectral narrowing within a regenerative amplifier by spectral profiling of the heart beat
The absorption and emission spectra of Yb:KYW Crystals Show robust peaks at 980 nm and 1030 nm, respectively, making certain efficient Vitality conversion and higher efficiency in laser techniques.
Optical structure of the laser with immediate pumping While using the radiation of semiconductor injection lasers. LD is an IPG Photonics laser diode with fiber output of the radiation, WP is really a half-wave plate, CL is often a collimating lens, FL is really a focusing lens, AE can be an Energetic element constructed from an Yb:KYW crystal, DM can be a spherical dichroic mirror, M1-M6 are the cavity mirrors, OC could be the output mirror, and SAM is really a semiconductor saturable-absorber mirror.
The monoclinic crystal constructions leads to a normal birefringence, assisting to keep away from thermally induced polarization rotation and depolarization reduction.
PDF Yb:KGW and Yb:KYW crystals have wide emission bandwidths and therefore are utilised as lasing resources to create ultrashort (~ 100-200 fs) higher energy pulses. Immediate pump of Yb:KGW/KYW crystals with laser diodes working at 981 nm supports compact laser units.
five mm besides the middle in the beam caustic. As a way to check the method matching simulation, we performed the experiment with Ng-cut crystal oscillator, which was made Earlier and in a exact affliction with simulation [11]. As revealed in Figure three(b) with crimson dots and line, the CW output energy is very dependent on the posture of laser crystal along with the experimental outcome coincides effectively with simulation final result. Like a Take note, multimode operation transpired in experiment in the event the dimension from the pump beam is larger sized than TEM00 cavity mode and it brings about better CW output ability inside the displacement area down below 3.5 mm.
... at 50 %-height were being produced inside a learn oscillator with selfsynchronization in click here the axial modes, explained in our previously post. 21 The new edition of the laser, not like that explained in our earlier post, used an Yb:KYW crystal by having an N pcut (optical axis N p from the index ellipsoid was parallel to your propagation path on the laser radiation), Using the polarization on the created radiation directed together the N m axis.
... Not merely the posture of crystal inside the cavity and also the amplification axis of crystal influences the laser operation drastically, since the absorption and emission cross sections in the crystal are really unique in accordance with the orientation on the crystal.
Although ytterbium-doped laser acquire media frequently exhibit a little quantum defect, ytterbium-doped tungstates permit for specially small values. As an example, a 1030-nm Yb:YAG laser would normally be pumped close to 940 nm, Whilst Yb:KGW or Yb:KYW could possibly be most efficiently pumped all over 981 nm.
Li2WO4-WO3 flux was productively used decreasing the growth temperature underneath 900 oC. According to single crystal x-ray measurements, the crystal corresponds towards the P2/n Room team.
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At the same time, a shorter laser wavelength may be attained; it is achievable to function by using a quantum defect very well beneath one%. Like a consequence, the warmth generation is usually so tiny this partly compensates the reduced thermal conductivity.