Everything about KYW Crystal
Everything about KYW Crystal
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This exceptional attribute of ultrafast pulses permits nonlinear optical interaction with tissue at lower Over-all publicity, and drives purposes which include deep-tissue multiphoton microscopy and high-precision eye surgical procedure
We present a twin-crystal Yb:KGW laserthat iscapable to function like a Q-switched oscillator with output energy up to 24 W and pulse duration of 20 ns,or as being a regenerative amplifier with output ability as many as 21 W and pulse length below two hundred fs soon after compression of chirped pulses. Each lasers have excellent beam excellent with beam parameter M2
FIG. 4. Autocorrelation function of the heartbeat 共a兲and spectrum 共b兲of the laser with a rectangular Energetic element for an output ability of seven hundred mW. The width of
This paper describes a femtosecond laser regenerative amplifier according to two Yb:KYW crystals with immediate longitudinal pumping by strong linear arrays of semiconductor injection lasers getting fiber output. To circumvent spectral narrowing for the duration of amplification and also the corresponding lengthening from the amplified pulse when it can be compressed, a combination of two Yb:KYW crystals were being used, While using the spectral maxima with the amplification shifted relative to one another and with spectral profiling of your amplified radiation.
Immediately after air drying and subsequent cleansing which has a cotton fabric soaked in alcohol, the movie surface confirmed no indications of peeling or scratches.
FIG. one. Optical layout of the laser with direct pumping with the radiation of semiconductor injection lasers. LD is definitely an IPG Photonics laser diode with fiber output
Tungstates tend to possess large Raman coefficients (�?Raman scattering). Thus, they might generate substantial Raman acquire at reasonable optical intensities. It is feasible to make use of the laser crystal by itself like a Raman converter.
... at fifty percent-height ended up generated within a learn oscillator with selfsynchronization in the axial modes, explained in our previously article. 21 The new version of your laser, as opposed to that explained in our previously short article, utilized an Yb:KYW crystal by having an N pcut (optical axis N p of the index ellipsoid was parallel for the propagation way of the laser radiation), Together with the polarization of your generated radiation directed alongside the N m axis.
... Not simply the place of crystal inside the cavity and also the amplification axis of crystal influences the laser Procedure considerably, as the absorption and emission cross sections with the crystal are pretty distinct in accordance with the orientation of your crystal.
The thermal conductivity of prevalent double tungstates is on the order to three–four W/(K m) �?which is not bad as opposed with other laser crystals (While numerous occasions fewer than for YAG), and rather huge compared Along with the thermal conductivity of standard Eyeglasses.
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Yb:KYW crystal (Yb-doped potassium yttrium tungstate) as compared to its counterpart Yb:KGW, is often a amazing material that performs a significant position in laser technological innovation. Its Principal perform would be to generate ultrashort pulses of sunshine, spanning only a few hundred femtoseconds.
Simultaneously, a shorter laser wavelength is often attained; it is feasible to operate using a quantum defect very well down below 1%. As being a consequence, the heat era might be so compact this partly compensates the lower thermal conductivity.