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     Erbium laser glass

   

Erbium and ytterbium co-doped phosphate glass has a broad application because of the excellent properties. Mostly, it is the best glass material for 1.54um laser due to its eyesafe wavelength of 1540 nm and high transmission through atmosphere. It’s also suitable for medical applications where the need for eye protection may be difficult to manage or diminish or hinder essential visual observation. Recently it is used in optical fiber communication instead of  EDFA for its more super plus. There is a great progress in this field.

We can also produce erbium laser glass with various ion doping according to your requirement. we have three kinds of Erbium-doped glasses. EP6, WM4,Cr14.

　

PROPERTIES Cr14 EP6 WM4
n d 1.5393 1.544 1.536
Density(g/cm 3 ) 3.10 3.15 2.83
Center lasing wavelength(nm) 　 1535 　
n at lasing wavelength 1.530 1.532
　		 　
Abbe value
　		 64 65 66
Stimulated cross section (pm 2 ) 0.8 0.8 0.75
Fluorescent lifetime (micro second) 7.7 9.0 8.0
Radiative lifetime (micro second) 8.8 　 9.1
FWHM (nm) 29 　 45
Transformation temp.(ºC) 455 442 530
Softening temp.(ºC) 493 470 573
a(25-80°C) (10 -7 /K) 103 　 82
a(25-300°C) (10 -7 /K) 127 　 96
Knoop hardness (kg/mm 2 ) 　 　 430
dn/dT (10 -7 /K) -52 -47 -30
dS/dT (10 -7 /K) 3.6 6.4 14
Coeff.of linear thermal expansion (10 -6 /ºC)（20~100ºC） 　 10 　
Non-linear refractive index coeff.n 2 (×10 － 13 e.s.u) 　 1.20 　
Weight loss at 100°C boiling water (mg/cm 2 .hr) 　 70μg/hr.cm 2

　

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