Nd:glass for high power laser

High-power laser glass---Nd:glass(N21 and N31)

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。

Lasertec's mainly offers two types of Nd 3+ doped phosphate glasses－N21and N31. Lasertec's Nd 3+ phosphate glasses are guaranteed in optical qualities such as homogeneity, striation, stress birefringence, Pt inclusions etc. The different neodymium doping phosphate glasses are ready for your quest. We have stocked 0.7%, 3.0%, and 4.0% doped N31 and N21. 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.

Table Properties of Nd 3+ -doped phosphate glass

	N21	N31
LASER PROPERTIES
Nd 2 O 3 (wt%)	2.2	2.2
Nd 3+ conc. (10 20 ions/cm 3 )	2.68	2.26
Cross section for stimulated emission(10 -20 cm 2 )	3.40±0.3	4.0±0.3
lift time (usec)	330	340±10
Fluorescence half-line width at 290ºK(Å)	240	201
Center lasing wavelength (nm)	1059	1059
OPTICAL PROERTIES
Non-linear refractive index coeff.n 2 (×10 －13 e.s.u)	1.3±0.1	1.1±0.1
n（1053nm）	1.5652	1.5280
n d	1.5758	1.5357
n F	1.5731	1.5413
n c	1.5820	1.5332
Abbe value	65.3	66.2
dn/dT (10 -6 /ºC) （20~100ºC）	-4.2	-4.3
Coeff.of linear thermal expansion (10 -6 /ºC)（20~100ºC）	11.0	10.7
Thermal coeff. (10 -6 /ºC) （20~100ºC）	1.9	1.4
THERMAL PROPERTIES
Transformation temp.(ºC)	500	430
Softening temp.(ºC)	530	475
Coeff.of linear thermal expansion (10 -6 /ºC) (100~TgºC)	12.0	12.7
Thermal conductivity (25ºC) (10 -3 W/cmºC)	5.53	5.58
Specific heat ( 25ºC) (J/cm 3 ºC)	0.75	0.75
CHEMICAL ROPERTIES
D w (H2O 100ºC 1hr)(wt. Loss%)	0.06	0.09
D A (HNO 3 pH2.2 100ºC 1hr) (wt. loss%)	0.30	0.40
OTEHER ROPERTIES
Density(g/cm 3 )	3.40	2.83
Young's modulus (kgf/mm 2 )	5640	5270
Posson's ratio	0.27	0.27
Knoop hardness (kg/cm 2 )	650	630