Yb:KGW and Yb:KYW Crystals
|Doping concentration||0.5 – 5.0 atm. % for Yb:KGW
0.5 – 10.0 atm. % for Yb:KYW
|Orientation||b-cut: Nm-axis is parallel to input/ output faces.
Other orientations available.
|Dimensional tolerances||+0/-0.05 mm|
|Length tolerance||±0.1 mm|
|Surface quality||10-5 S-D|
|Surface flatness||<λ/10 @ 632.8 nm|
|Parallelism error||<10 arcsec|
|Protective chamfers||<0.1 mm x 45°|
The broad spectral emission band of Yb:KYW allows the tuning of the laser radiation over 1020-1060 nm range and the generation of femtosecond pulses shorter than 70 fs. Enhanced storage capacity, wide absorption spectrum at 980 nm and high absorption of pump radiation in a small crystal region allow an efficient use of diode laser pump.
As compared to YAG or glasses used as hosts for Yb3+, KYW and KGdW have the advantage of a larger absorption cross section than YAG, which decreases the minimum pump intensity necessary to achieve transparency in the quasi-two-level system of ytterbium.
|High absorption coefficient @ 980 nm|
|High stimulated emission cross section|
|Low laser threshold|
|Extremely low quantum defect|
|Broad output at 1020-1060 nm|
|High slope efficiency with diode pumping (>55%)|
|High Yb-doping concentration|