N21
N21 is an Nd^3+ doped phosphate glass that can be used for high energy applications. It exhibits moderate stimulated emission cross section and excellent chemical durability.
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Laser Specifications
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Nd _2 O_3 (wt %): 2.2
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Nd^3+ conc. (10^20 ions / cm^3): 2.7 ± 0.1
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Cross section for stimulated emission (10^-20 cm^2): 3.4 ± 0.3
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Lifetime at 1053 nm (μsec)*: ≥ 330 (Nd_2 O_3 2.2 wt %)
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Effective bandwidth (nm): 24.0
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Fluorescence peak wavelength (nm): 1053
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Absorption coefficient (cm^-1):
≤ 0.0015 (1053 nm)
≤ 0.25 (400 nm)
≤ 1.5 (3333 nm)
Optical Specifications
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Non-linear refractive index coeff. n_2 (× 10^-13 e.s.u): 1.3 ± 0.1
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Refractive index (1053 nm): 1.5652
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Abbe value: 65.3
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dn/dT (10^-6 / ºC) (20 ~ 100 ºC): - 4.2
Thermal Specifications
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Transformation temp. (ºC): 500
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Softening temp. (ºC): 530
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Coeff. of linear thermal expansion (10^-7 / K) (30 ~ 100 ºC): N/A
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Coeff. of linear thermal expansion (10^-7 / K) (30 ~ 300 ºC): 120
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Thermal coeff. of optical path length (10^-6 / K) (50 ~ 100 ºC): 1.9
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Thermal conductivity (25 ºC) (W / m K): 0.55
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Specific heat ( 25 ºC) (J / g K): 0.75
Chemical Specifications
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D_w (H_2O 98ºC) (mg / (cm^2/day)): 0.08
Other Specifications
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Density (g / cm^3): 3.4
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Young’s modulus (G Pa): 56.4
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Posson’s ratio: 0.27
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Knoop hardness (kg / cm^2): 650
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Fracture toughness (MPa· m ^1/2): N/A