KYW Crystal Secrets
KYW Crystal Secrets
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The gain bandwidth e.g. of Yb:KGW and Yb:KYW is rather large in comparison with that of Yb:YAG. This allows for extensive wavelength tunability and for A great deal shorter pulse durations from mode-locked lasers. Values very well below one hundred fs have already been accomplished with passive method locking.
The Yb-doped potassium yttrium tungstate (Yb:KYW) crystal, in comparison with its counterpart Yb:KGW, can be a impressive product that plays an essential position in laser engineering. Its Key operate should be to deliver ultrashort pulses of sunshine, spanning only a few hundred femtoseconds.
time. Crystals with the compound melts congruently at 1007 oC, nonetheless melt crystallization of top quality crystal is impossible due to section changeover at ~920 oC. The highest seeded Answer technique from
FIG. four. Autocorrelation functionality of the heart beat 共a兲and spectrum 共b兲of the laser with an oblong Lively element for an output ability of 700 mW. The width of
Ultrafast lasers, with pulse widths of some picoseconds (ten−twelve s) or a lot less, help the time resolution necessary in laser-thrilled fluorescence lifetime spectroscopy and imaging techniques.Additionally, they deliver superior pulse peak powers at high repetition prices and average average output powers.
The monoclinic crystal structures leads to a purely natural birefringence, assisting to stay clear of thermally induced polarization rotation and depolarization decline.
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Tungstates are likely to own high Raman KYW Crystal coefficients (�?Raman scattering). For that reason, they can crank out major Raman attain at average optical intensities. It can be done to make use of the laser crystal alone being a Raman converter.
For tungstates, the ytterbium doping focus can be very higher without the need of sizeable quenching since the changed ions have a very identical ion radius, plus the inter-ion distance is fairly massive.
... Not merely the placement of crystal while in the cavity and also the amplification axis of crystal affects the laser Procedure tremendously, since the absorption and emission cross sections of your crystal are pretty distinctive in accordance with the orientation of the crystal.
The thermal conductivity of common double tungstates is in the order to three–4 W/(K m) �?which isn't undesirable in contrast with other laser crystals (Though many moments lower than for YAG), and pretty substantial when compared Along with the thermal conductivity of normal Eyeglasses.
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At the same time, a shorter laser wavelength is usually acquired; it is feasible to operate having a quantum defect perfectly beneath one%. Being a consequence, the heat generation could be so modest this partly compensates the reduced thermal conductivity.