KYW Crystal No Further a Mystery
KYW Crystal No Further a Mystery
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The Yb-doped potassium yttrium tungstate (Yb:KYW) crystal, in comparison to its counterpart Yb:KGW, is a impressive substance that performs a very important role in laser technologies. Its Main perform would be to crank out ultrashort pulses of sunshine, spanning only a few hundred femtoseconds.
time. Crystals with the compound melts congruently at 1007 oC, on the other hand melt crystallization of top of the range crystal is difficult as a result of phase changeover at ~920 oC. The top seeded Resolution approach from
FIG. four. Autocorrelation operate of the pulse 共a兲and spectrum 共b兲of the laser with a rectangular Energetic ingredient for an output electricity of seven-hundred mW. The width of
Optical layout of the laser with direct pumping While using the radiation of semiconductor injection lasers. LD can be an IPG Photonics laser diode with fiber output with the radiation, WP is actually a 50 %-wave plate, CL can be a collimating lens, FL is a focusing lens, AE can be an active factor made from an Yb:KYW crystal, DM is often a spherical dichroic mirror, M1-M6 are classified as the cavity mirrors, OC is the output mirror, and SAM is actually a semiconductor saturable-absorber mirror.
The monoclinic crystal structures results in a natural birefringence, helping to stay away from thermally induced polarization rotation and depolarization loss.
PDF Yb:KGW and Yb:KYW crystals have broad emission bandwidths and are used as lasing materials to deliver ultrashort (~ one hundred-200 fs) superior electric power pulses. Direct pump of Yb:KGW/KYW crystals with laser diodes functioning at 981 nm supports compact laser devices.
Tungstates are likely to have higher Raman coefficients (�?Raman scattering). For that reason, they might produce substantial Raman obtain at moderate optical intensities. It is feasible to utilize the laser crystal alone to be a Raman converter.
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... Not simply the placement of crystal while in the cavity but will also the amplification axis of crystal has an effect on the laser Procedure considerably, since the absorption and emission cross sections from the crystal are quite distinctive in accordance with the orientation in the crystal.
The thermal conductivity of typical double tungstates is with the order to 3–four W/(K m) �?which isn't negative as opposed with other laser crystals (Even though several instances fewer than for YAG), and pretty substantial as opposed Using the thermal conductivity of standard glasses.
Li2WO4-WO3 flux was productively utilized cutting down The expansion temperature down below 900 oC. Based on single crystal x-ray measurements, the crystal corresponds for the P2/n Room group.
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