Erbium - WM4

Laser output at 1535 nm can be realized with erbium doped phosphate glass. Since this wavelength is safe for the eyes and stays in the communication window, erbium doped phosphate glass can find wide applications in communications, laser range finders, laser medical treatment, laser cosmetics, etc. Erbium laser glass with various doping concentrations can be produced according to a customer’s requirements.

The WM4 product is an erbium phosphate glass for ion-exchange purposes.

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Laser Specifications

Cross section for stimulated emission (10^-20 cm^2): 0.75

Fluorescent lifetime (ms)*: 7.7 - 8.2

Center lasing wavelength (nm): 1535

Optical Specifications

Refractive index (1535 nm): 1.528

Refractive index (d 589.3 nm): 1.536

Abbe value: 66

dn/dT (10^-6 / ºC) (20 ~ 100 ºC): - 3.0

Thermal Specifications

Transformation temp. (ºC): 530

Softening temp. (ºC): 573

Coeff. of linear thermal expansion (10^-7 / K) (20 ~ 100 ºC): 82

Coeff. of linear thermal expansion (10^-7 / K) (100 ~ 300 ºC): 96

Thermal coeff. of optical path length (10^-6 / K) (20 ~ 100 ºC): 1.4

Thermal conductivity (25 ºC) (W / m K): 0.70

Other Specifications

Density (g / cm^3): 2.83

Chemical durability: 82

(weigh loss rate at 100ºC distilled water) (μg / hr. cm^2)

* Note: The fluorescent lifetime changes with the erbium concentration.