An Unbiased View of KYW Crystal
An Unbiased View of KYW Crystal
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The Yb-doped potassium yttrium tungstate (Yb:KYW) crystal, compared to its counterpart Yb:KGW, is really a extraordinary product that plays a vital part in laser know-how. Its Principal operate is usually to create ultrashort pulses of light, spanning just some hundred femtoseconds.
The Yb:KYW crystal’s proficiency in gentle absorption at all over 981 nm would make the crystal compatible for diode pumping. It's more Improved by its exceptional effectiveness in this process, coupled with its lower quantum defect.
Coloration-coded reflectivity of the Bragg mirror as being a perform of wavelength and angle on the incident beam.
Ultrafast lasers, with pulse widths of a few picoseconds (ten−twelve s) or considerably less, permit time resolution needed in laser-thrilled fluorescence life span spectroscopy and imaging approaches.Additionally, they provide high pulse peak powers at high repetition fees and average normal output powers.
Prior to the development of Nd:YAG, Nd3+:CaWO4 was a vital rare-earth-doped laser achieve medium. It absolutely was in truth Employed in the primary consistently operating crystal laser.
FIG. one. Optical structure of the laser with immediate pumping While using the radiation of semiconductor injection lasers. LD is surely an IPG Photonics laser diode with fiber output
five mm other than the middle with the beam caustic. In an effort to Check out the method matching simulation, we performed the experiment with Ng-Slash crystal oscillator, which was made Formerly and in a identical problem with simulation [eleven]. As proven in Figure three(b) with pink dots and line, the CW output energy is very depending on the posture of laser crystal and the experimental consequence coincides very well with simulation outcome. Like a Observe, multimode Procedure occurred in experiment if the dimensions with the pump beam is larger than TEM00 cavity method and it triggers larger CW output energy inside the displacement location below three.5 mm.
... at fifty percent-height were being produced within a master oscillator with selfsynchronization of your axial modes, explained within our earlier article. 21 The new edition in the laser, unlike that explained in our before post, made use of an Yb:KYW crystal by having an N pcut (optical axis N p from the index ellipsoid was parallel to your propagation path of your laser radiation), Together with the polarization of the created radiation directed along the N m axis.
By substituting yttrium with ytterbium in the crystal lattice of Yb:KYW as a result of equivalent sizes of such chemical factors as much as a hundred% of Yb-doping may be accomplished.
The thermal conductivity of common double tungstates is with the order to three–four W/(K m) �?which is not bad compared with other laser crystals (Despite the fact that a number of periods lower than for YAG), and rather large as opposed With all the thermal conductivity of regular Eyeglasses.
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Simultaneously, a shorter laser wavelength can be received; it is feasible to work by using a quantum defect nicely down below 1%. To be a consequence, the heat technology may be so compact that this partly compensates the decreased thermal conductivity.