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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.

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Specification
Dimension tolerance: (W +/- 0.1 mm) x (H +/- 0.1 mm) x (L +/- 0.2 mm)
Transmitting wavefront distortion: l/8 @633nm
Clear aperture: > 90% central area
Flatness: l/8 @633nm
Scratch/Dig code: 10/5 to MIL-O-13830A
Parallelism: better than 20 arc seconds
Perpendicularity: 5 arc minutes
Angle tolerance: Dq< +/-0.5° Df< +/-0.5°
AR coating: R< 0.1% at 1064nm and R<0.4% at 532 nm
Quality Warranty Period: one year under proper use
 
Standard Products (Erbium Laser Glass)
Cr14
EP6
WM4
n d
1.5393
1.544
1.536
Density(g/cm3)
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 (pm2 )
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/mm2 )
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
(¡Á10 £­ 13 e.s.u)
1.20
Weight loss at 100°C boiling water
(mg/cm2.hr)
70¦Ìg/hr.cm2