Nd-doped phosphate glasses N21 and N31 are gain materials for high-energy and average-power solid-state lasers. The reference data distinguish glass grades, doping concentrations and optical-quality requirements rather than treating them as interchangeable materials.
Properties, applications and specifications

Nd doped phosphate glass have been widely used in high average power laser solid state lasers,laser material processing, range finder and other industrial and scientific applications。
Reference grades include two types of Nd 3+ doped phosphate glasses-N21and N31. Optical-quality criteria for Nd 3+ phosphate glasses include homogeneity, striation, stress birefringence, Pt inclusions etc.
Reference N31 and N21 phosphate-glass doping levels include 0.7%, 3.0% and 4.0%.
N21- an Nd 3+ : phosphate glass is specially developed for the LF1 # and LF2 # Laser Facility. It consist of two high power laser beams at 1.054um, each has an output aperture of 200mm with output power of 10 12 W. Its operation represents a significant achievement of laser technology in China. This kind of glass exhibits the moderate cross section for stimulated emission and the excellent chemical durability. N31-a new Nd 3+ : phosphate glass is specially developed for the LF12 # Laser Facility-at present the most powerful laser facility in China(also called “Shengguang” in SIOM of China)It exhibits the nearly same qualification with HOYA LHG8.
Specification
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Orientation:
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Random
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Dimensional Tolerance:
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Diameter +/-0.1mm ,Length+/-0.5mm
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Wavefront Distortion:
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<λ/8 at 633nm per inch
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Surface Quality:
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20/10
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Parallelism:
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< 10 arc seconds
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Perpendicularity:
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< 5 arc minutes
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Surface Flatness:
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<λ/10 at 633nm
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Clear Aperture:
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Central 95%
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Chamfer:
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0.15x45°
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Coating:
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AR coating
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Standard Products
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Part No
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Diameter(mm)
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Length(mm)
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Doping
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Cut angle
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Coating
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NdGL-0225
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2
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25
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N32
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Random
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AR/AR1053 nm
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NdGL-0220
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2
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20
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N32
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Random
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AR/AR1053 nm
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NdGL-0325
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3
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25
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N31
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Random
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AR/AR1053 nm
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NdGL-0320
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3
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20
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N31
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Random
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AR/AR1053 nm
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NdGL-0530
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5
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30
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N31
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Random
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AR/AR1053 nm
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NdGL-0320
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5
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50
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N31
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Random
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AR/AR1053 nm
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NdGL-0325
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8
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50
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N31
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Random
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AR/AR1053 nm
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NdGL-0320
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8
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100
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N31
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Random
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AR/AR1053 nm
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