5 Simple Statements About KYW Crystal Explained
5 Simple Statements About KYW Crystal Explained
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The get bandwidth e.g. of Yb:KGW and Yb:KYW is very huge in comparison with that of Yb:YAG. This allows for huge wavelength tunability and for Substantially shorter pulse durations from manner-locked lasers. Values effectively beneath one hundred fs are already attained with passive mode locking.
This distinctive attribute of ultrafast pulses allows nonlinear optical conversation with tissue at low Total publicity, and drives purposes including deep-tissue multiphoton microscopy and substantial-precision eye surgical treatment
time. Crystals of your compound melts congruently at 1007 oC, nonetheless melt crystallization of top quality crystal is unattainable on account of stage transition at ~920 oC. The best seeded Alternative technique from
FIG. 4. Autocorrelation functionality of the heartbeat 共a兲and spectrum 共b兲of a laser with a rectangular Lively element for an output electricity of 700 mW. The width of
This paper describes a femtosecond laser regenerative amplifier according to two Yb:KYW crystals with direct longitudinal pumping by highly effective linear arrays of semiconductor injection lasers obtaining fiber output. To circumvent spectral narrowing all through amplification and also the corresponding lengthening from the amplified pulse when it is actually compressed, a combination of two Yb:KYW crystals were being employed, With all the spectral maxima on the amplification shifted relative to one another and with spectral profiling with the amplified radiation.
The monoclinic crystal constructions leads to a normal birefringence, assisting to keep away from thermally more info induced polarization rotation and depolarization reduction.
FIG. one. Optical format 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
Tungstates have a tendency to acquire high Raman coefficients (�?Raman scattering). Thus, they might make substantial Raman acquire at moderate optical intensities. It is achievable to make use of the laser crystal itself to be a Raman converter.
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By substituting yttrium with ytterbium during the crystal lattice of Yb:KYW due to the comparable sizes of those chemical factors up to a hundred% of Yb-doping can be realized.
The thermal conductivity of prevalent double tungstates is with the purchase to 3–four W/(K m) �?which isn't negative in contrast with other laser crystals (although quite a few periods below for YAG), and relatively large as opposed Together with the thermal conductivity of common Eyeglasses.
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Yb:KYW crystal (Yb-doped potassium yttrium tungstate) compared to its counterpart Yb:KGW, is usually a extraordinary material that plays a very important job in laser technological know-how. Its Most important purpose is usually to produce ultrashort pulses of light, spanning just a couple hundred femtoseconds.
At the same time, a shorter laser wavelength might be received; it can be done to operate with a quantum defect effectively under one%. To be a consequence, the warmth generation may be so tiny that this partly compensates the decrease thermal conductivity.