Single crystals of potassium-yttrium tungstate (KYW:Yb), doped with ytterbium ions, α-KY (WO4) 2-Yb3 +, are used in lasers to generate ultrashort pulses (50-200 fsec). KYW:Yb single crystals are a unique laser material that allows laser diodes to be used most efficiently (efficiency> 50%).

Specifications:

Density (g/сm3)	6,565
Transparency range (mkm)	0.35 – 5.5
Refraction index (λ = 1.067 mkm)	np = 1.9688 nm = 2.0065 ng = 2.057
Orientation	[010]
Dopant concentration	2 – 10 atm.%
Adsorption coefficient (λ =1150 nm)	−4 cm−1
Wavelength lasing (nm)	1025
Impulse duration (fsec)	50–200
Repetition rate (MHz)	10–50