AdvatechUK

Erbium and Ytterbium co-doped phosphate glass  is one of the best suited materials for lasing at 1.54µm, a wavelength which is well suited to ‘eye safe’ applications.


Advatech offers two types of Erbium doped phosphate glass, EAT14 and CR14





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Erbium Laser Glass Rods


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Er:Glass Laser - EAT14


EAT14 is Erbium Glass doped with Er 3+ and Yb 3+ and suited to applications involving high repetition rates (1 - 6 Hz) and being pumped with 1535 nm laser diodes. This glass is available with high levels of Erbium (up to 1.7%).





Er:Glass - CR14


Cr14 is Erbium Glass doped with Er 3+, Yb 3+ and Cr 3+ and suited to applications involving xenon lamp pumping. This glass is often used in laser range finder (LRF) applications.





Er:Glass Laser Properties


Laser / Optical Properties

Units

EAT14

CR14

Laser Wavelength Peak

nm

1535

1535

Cross-section for Stimulated Emission

10‾²º cm²

0.8

0.8

Fluorescent Lifetime

ms

7.7-8.0

7.7-8.0

Radiative Lifetime




Fluorescence Linewidth (FWHM)

nm



Fluorescence Linewidth (Effective)

nm



Loss @ Lasing Wavelength

%cm-1



Refractive Index (nD) @ 589 nm


1.532

1.539

Refractive Index (n) @ 1535 nm


1.524

1.53

Nonlinear Index N2


1.532

1.539

Abbe Value


66

64

dn/dT (20~100ºC)

 10‾⁶/ºC

-1.72

-5.2

Thermal Coeff. of Optical Path Length (20~100ºC)

10‾/ºC

29

3.6

Physical / Thermal Properties

Units

EAT14

CR14

Transformation Temperature

ºC

556

455

Softening Temperature

ºC

605

493

Coeff. of Linear Thermal Expansion (20~100ºC)

 10‾/ºC

87

103

Thermal Conductivity (@ 25ºC)

W/m. ºK

0.7

0.7

Specific Heat

 J/g K



Chemical Durability (@100ºC weigh loss rate distilled water)   

μg/hr.cm²

52

103

Density  

g/cm³

3.06

3.1

Durability Knoop Hardness

kgf/mm2



Young's Modulus

10^3 N/mm2



Poisson's Ratio




Damage Threshold (1ns)

J/cm3



Variants

Er 3+

Yb 3+

0.13%:Er:Yb:Glass

1.3x10^19/cm3

2.1x10^21/cm3

0.26%:Er:Yb:Glass

2.6x10^19/cm3

2.1x10^21/cm3

0.50%:Er:Yb:Glass

 5x10^19/cm3

2.1x10^21/cm3

1.00%:Er:Yb:Glass

 10x10^19/cm3

2.1x10^21/cm3

1.18%:Er:Yb:Glass

 11.8x10^19/cm3

2.1x10^21/cm3

1.26%:Er:Yb:Glass

12.6x10^19/cm3

2.1x10^21/cm3

1.70%:Er:Yb:Glass

17x10^19/cm3

 2.1x10^21/cm3

Erbium Laser Glass - EAT14 Standard Dopings


Erbium Laser Glass - CR14 Standard Dopings


Variants

Er 3+

Yb 3+

Cr 3+

0.13%:Er:Yb:Cr:Glass

1.3x10^19/cm3

2.0x10^21/cm3

0.5x10^19/cm3

0.13%:Er:Yb:Cr:Glass

1.3x10^19/cm3

2.0x10^21/cm3

0.2x10^21/cm3