KYW Crystal - An Overview
KYW Crystal - An Overview
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The attain bandwidth e.g. of Yb:KGW and Yb:KYW is extremely significant as opposed with that of Yb:YAG. This permits for vast wavelength tunability and for much shorter pulse durations from mode-locked lasers. Values well below 100 fs have been reached with passive mode locking.
This exclusive attribute of ultrafast pulses allows nonlinear optical conversation with tissue at lower General publicity, and drives programs which include deep-tissue multiphoton microscopy and significant-precision eye surgical treatment
Femtosecond laser based on Yb:KYW crystals with suppression of spectral narrowing in a very regenerative amplifier by spectral profiling of the pulse
Color-coded reflectivity of a Bragg mirror for a perform of wavelength and angle of the incident beam.
Optical structure of a laser with immediate pumping Along with the radiation of semiconductor injection lasers. LD is surely an IPG Photonics laser diode with fiber output of your radiation, WP is often a half-wave plate, CL is often a collimating lens, FL is often a focusing lens, AE is undoubtedly an active aspect made from an Yb:KYW crystal, DM can be a spherical dichroic mirror, M1-M6 are the cavity mirrors, OC would be the output mirror, and SAM is really a semiconductor saturable-absorber mirror.
The monoclinic crystal structures results in a all-natural birefringence, assisting to prevent thermally induced polarization rotation and depolarization reduction.
FIG. 1. Optical structure of a laser with immediate pumping While using the radiation of semiconductor injection lasers. LD is really an IPG Photonics laser diode with fiber output
5 mm aside from the center from the beam caustic. To be able to Verify the manner matching simulation, we executed the experiment with Ng-Slice crystal oscillator, which was designed Formerly As well as in a very same problem with simulation [eleven]. As demonstrated in Figure 3(b) with pink dots and line, the CW output electricity is highly dependent on the posture of laser crystal along with the experimental result coincides very well with simulation result. For a note, multimode operation transpired in experiment in the event the dimensions from the pump beam is larger than TEM00 cavity mode and it will cause greater CW output electric power in the displacement region under three.five mm.
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By substituting yttrium with ytterbium inside the crystal lattice of Yb:KYW because of the comparable dimensions of those chemical elements nearly one hundred% of Yb-doping could be realized.
Whilst ytterbium-doped laser achieve media normally exhibit a small quantum defect, ytterbium-doped tungstates enable for specifically modest values. By way of example, a 1030-nm Yb:YAG laser would Generally be pumped all around 940 nm, whereas Yb:KGW or Yb:KYW might be most efficiently pumped all-around 981 nm.
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