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Yb:KYW crystal is an excellent laser gain material and are used as a lasing materials to generate ultrashort high power pulses. Yb:KYW can be used as ultrashort pulses amplifiers too. It is one of the best materials for high power thin disk lasers. Its broad spectral emission band 1023-1060nm allows the generation of ultrashort(80 -200 fs) high power pulses. Its wide absorption spectrum at 981 nm and high absorption of pump radiation allow an efficient use of diode laser pumping.Yb: KYW has the advantage of larger absorption cross section, which decreases the minimum pump intensity necessary to achieve transparency in the quasi-two-level system of ytterbium.
Basic Properties :
Crystal structure |
monoclinic |
Yb3+ concentration |
0.5-100% |
Point group |
C2/c |
Cell Parameters |
a=8.13Å;b= 10.36 Å; c = 7.59 Å; β=94.26° |
Melting Point: |
1045℃ |
Density, g/cm3 |
6.61 |
Mohs hardness |
4-5 |
Transmission range |
350–5500 nm |
Lasing Wavelength |
1023-1060nm |
Absorption band |
981nm(FWHM 8nm) |
Absorption cross section |
1.33×10-19cm2 |
Stimulated emission cross section (E║a) |
3×10-20cm2 |
Fluorescent lifetime |
0.6ms (10% doping) |
Specifications of Yb:KYW :
Orientation |
[010], Nm axis is parallel to input/output faces |
Standard Dopant concentration (at. %) |
10% |
Maximum length |
20mm |
Size tolerance, mm |
±0.1 |
Parallelism |
10″ |
Flatness |
λ/10@633nm |
Perpendicularity |
< 10' |
Surface quality |
10/5 (MIL-PRF-13830B) |