Yb:CALGO - Ytterbium-doped Calcium Aluminum Gadolinium Oxide

Electro-Optics Technology GmbH has been growing Yb:CALGO for over 10 years. During this time, material properties and qualities have improved to make it one of the best solutions on the market. You will find our material to have lower absorption and higher transmission than are commonly found on the market. EOT GmbH specializes in controlling the dopant level to optimize your pumping requirements. Our high quality Yb:CALGO is a highly effective laser medium for high power ultrafast lasers. It is widely used in laser processing applications.

With over 20 years of polishing and fabrication experiece, EOT GmbH has become a world leader in providing 2D and 3D crystal designs. We also offer low absorbing, high damage threshold optical coatings.

MATERIAL PARAMETERS

Host Crystal	CaGdAlO₄
Structure	Tetragonal, I4/mmm
Lattice Parameters	a = 3.66 A c = 12.01 A
Thermal Expansion Coefficient	α_a= 10.1 · 10^-6 K^-1 α_c= 16.2 · 10^-6 K^-1
Thermal Conductivity (2% Yb)	W_a = 6.9 Wm^-1 K^-1 W_c = 6.3 Wm^-1 K^-1
Melting Point	Approximately 1750 °C
Density	5.94 g/cm³
Refractive Indices at 1043 nm	n_a = 1.916 n_c = 1.94

LASER PARAMETERS

Dopant Concentrations for Yb	Up to 10%; 1% corresponds to 1.25 x 10²⁰/cm³
Absorption Cross Section at 979 nm	4.42 · 10^-20 cm² (for polarization along c-axis) 1.65 · 10^-20 cm² (for polarization along a-axis)
Absorption Bandwidth	4 nm
Fluorescence Lifetime	0.44 ms (for<5 at% Yb)
Emission Cross Section (990 nm to 1040 nm)	0.8 · 10^-20 cm² (for polarization along a-axis)
Emission Bandwidth	60 nm