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N21- an Nd3+: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 1012W. 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.

Properties of Nd3+-doped phosphate glass N21

 

N21

LASER PROPERTIES
Nd2O3 (wt%)
Nd3+ conc. (1020ions/cm3)
Cross section for stimulated emission(10-20cm2)
lift time (usec)
Fluorescence half-line width at 290ºK(Å)
Center lasing wavelength (nm)



2.2
2.68
3.40¡À0.3
330
240
1053

OPTICAL PROERTIES
Non-linear refractive index coeff.n2(¡Á10£­13e.s.u)
n£¨1053nm£©
nd
nF
nc
Abbe value
dn/dT (10-6/ºC) £¨20~100ºC£©
Coeff.of linear thermal expansion (10-6/ºC)£¨20~100ºC£©
Thermal coeff. of optical path length (10-6/ºC) £¨20~100ºC£©



1.3¡À0.1
1.5652
1.5758
1.5731
1.5820
65.3
-4.2
11.0
1.9

THERMAL PROPERTIES
Transformation temp.(ºC)
Softening temp.(ºC)
Coeff.of linear thermal expansion (10-6/ºC) (100~TgºC)
Thermal conductivity (25ºC) (10-3W/cmºC)
Specific heat ( 25ºC) (J/cm3ºC)



500
530
12.0
5.53
0.75

CHEMICAL ROPERTIES
Dw (H2O 100ºC 1hr)(wt. Loss%)
DA(HNO3 pH2.2 100ºC 1hr) (wt. loss%)


0.06
0.30

OTEHER ROPERTIES
Density(g/cm3)
Young¡¯s modulus (kgf/mm2)
Posson¡¯s ratio
Knoop hardness (kg/cm2)



3.40
5640
0.27
650

 

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