Top KYW Crystal Secrets
Top KYW Crystal Secrets
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This unique characteristic of ultrafast pulses enables nonlinear optical conversation with tissue at very low Over-all publicity, and drives applications for example deep-tissue multiphoton microscopy and substantial-precision eye medical procedures
time. Crystals in the compound melts congruently at 1007 oC, nevertheless soften crystallization of top of the range crystal is unattainable on account of stage changeover at ~920 oC. The highest seeded Remedy process from
Color-coded reflectivity of the Bragg mirror as a perform of wavelength and angle with the incident beam.
This paper describes a femtosecond laser regenerative amplifier dependant on two Yb:KYW crystals with direct longitudinal pumping by impressive linear arrays of semiconductor injection lasers obtaining fiber output. To prevent spectral narrowing for the duration of amplification and also the corresponding lengthening on the amplified pulse when it really is compressed, a combination of two Yb:KYW crystals were being made use of, Using the spectral maxima on the amplification shifted relative to each other and with spectral profiling of the amplified radiation.
The monoclinic crystal constructions leads to a organic birefringence, helping to stay clear of thermally induced polarization rotation and depolarization loss.
FIG. 1. Optical structure of the laser with direct pumping While using the radiation of semiconductor injection lasers. LD is definitely an IPG Photonics laser diode with fiber output
5 mm aside from the middle on the beam caustic. So as to Verify the manner matching simulation, we done the experiment with Ng-Slice crystal oscillator, which was formulated Formerly and in a very same affliction with simulation [eleven]. As proven in Determine 3(b) with purple dots and line, the CW output electric power is very dependent on the place of laser crystal as well as the experimental end result coincides properly with simulation consequence. Being a Observe, multimode Procedure transpired in experiment in the event the dimension in the pump beam is bigger than TEM00 cavity method and it brings about bigger CW output energy while in the displacement location down below 3.5 mm.
... at fifty percent-height ended up generated inside a master oscillator with selfsynchronization on the axial modes, explained in our before post. 21 The new edition in the laser, contrary to that described within our before posting, utilized an Yb:KYW crystal with an N pcut (optical axis N p from the index ellipsoid was parallel into the propagation route of your laser radiation), Along with the polarization with the created radiation directed alongside the N m axis.
By substituting more info yttrium with ytterbium within the crystal lattice of Yb:KYW due to identical sizes of such chemical aspects up to a hundred% of Yb-doping can be realized.
Though ytterbium-doped laser obtain media frequently exhibit a small quantum defect, ytterbium-doped tungstates let for particularly smaller values. As an example, a 1030-nm Yb:YAG laser would Usually be pumped close to 940 nm, While Yb:KGW or Yb:KYW may be most proficiently pumped around 981 nm.
Li2WO4-WO3 flux was correctly used lowering The expansion temperature underneath 900 oC. In line with single crystal x-ray measurements, the crystal corresponds into the P2/n space team.
Yb:KYW crystal (Yb-doped potassium yttrium tungstate) in comparison with its counterpart Yb:KGW, is a outstanding product that performs a significant role in laser engineering. Its Key function is usually to generate ultrashort pulses of light, spanning just some hundred femtoseconds.
Simultaneously, a shorter laser wavelength could be obtained; it is feasible to function that has a quantum defect perfectly underneath 1%. As a consequence, the heat technology is usually so compact that this partly compensates the decrease thermal conductivity.