The KYW Crystal Diaries
The KYW Crystal Diaries
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The attain bandwidth e.g. of Yb:KGW and Yb:KYW is very significant as opposed with that of Yb:YAG. This permits for wide wavelength tunability and for A lot shorter pulse durations from manner-locked lasers. Values well underneath one hundred fs are already reached with passive mode locking.
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time. Crystals in the compound melts congruently at 1007 oC, nevertheless soften crystallization of high quality crystal is not possible as a consequence of stage changeover at ~920 oC. The very best seeded Alternative approach from
The absorption and emission spectra of Yb:KYW Crystals Display screen sturdy peaks at 980 nm and 1030 nm, respectively, ensuring economical energy conversion and substantial overall performance in laser units.
Optical structure of a laser with direct pumping Together with the radiation of semiconductor injection lasers. LD is definitely an IPG Photonics laser diode with fiber output with the radiation, WP is usually a fifty percent-wave plate, CL can be a collimating lens, FL is really a concentrating lens, AE can be an Energetic ingredient constructed from an Yb:KYW crystal, DM is actually a spherical dichroic mirror, M1-M6 are classified as the cavity mirrors, OC may be the output mirror, and SAM is often a semiconductor saturable-absorber mirror.
The monoclinic crystal structures leads to a normal birefringence, assisting to prevent thermally induced polarization rotation and depolarization decline.
PDF Yb:KGW and Yb:KYW crystals have wide emission bandwidths and they are used as lasing materials to make ultrashort (~ 100-200 fs) higher electrical power pulses. Direct pump of Yb:KGW/KYW crystals with laser diodes working at 981 nm supports compact laser methods.
5 mm besides the center with the beam caustic. As a way to Look at the mode matching simulation, we done the experiment with Ng-Reduce crystal oscillator, which was formulated previously and in a exact problem with simulation [eleven]. As shown in Figure three(b) with pink dots and line, the CW output electricity is extremely depending on the place of laser crystal plus the experimental consequence coincides perfectly with simulation outcome. For a note, multimode operation transpired in experiment if the sizing from the pump beam is more substantial than TEM00 cavity manner and it results in greater CW output electricity while in the displacement location underneath three.five mm.
For tungstates, the ytterbium doping focus can be quite higher without sizeable get more info quenching since the replaced ions have a very identical ion radius, along with the inter-ion distance is fairly big.
... Not only the position of crystal within the cavity but additionally the amplification axis of crystal impacts the laser operation tremendously, because the absorption and emission cross sections in the crystal are really distinct based on the orientation in the crystal.
The thermal conductivity of frequent double tungstates is from the get to three–4 W/(K m) �?which is not lousy when compared with other laser crystals (Despite the fact that numerous occasions less than for YAG), and rather huge in contrast with the thermal conductivity of regular glasses.
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Concurrently, a shorter laser wavelength may be acquired; it is achievable to work which has a quantum defect nicely under 1%. Being a consequence, the warmth technology is usually so small that this partly compensates the reduce thermal conductivity.