Low-threshold, highly effective laser material

  Low pumping energies (0.5 to 1.0 J)

Nd:KGW (Neodimium Doped Potassium Gadolinium Tungstate, Nd:KGd(WO4)2  )

Nd:KGW  is a low-threshold, highly effective laser material. At low pumping energies (0.5 to 1.0 J), KGW is one the few materials ensuing an effective laser generation. The efficiency of a KGW laser with low pump power may be 3 - 5 times better than that of  a YAG laser. KGW single crystals can also be used for the fabrication of high-efficiency lasers with high output energy.
 

Basic Properties

Formula	Nd:KGd(WO4)2
Structure Symmetry	Monoclinic; 2/m; l2/a
Lattice Constants	a=8.10A, b=10.43A, c=7.60A, β=94.4°
Melting Point	1075 °C
Phase Transition to Tetragonal Form	1005 °C
Hardness, Mohs	4
Density	7.27g/cm3
Thermal Conductivity	2.8[100]; 2.2[010]; 3.5[001] W/m/K
Transmission Range	350 ~5500 nm
Refractive Index (@1067nm)	ng=2.033; nm=1.986; np=1.937
Fluorescent Lifetime	110 μs (3% doping), 90 μs ( 8% doping)
Thermal Expansion	4.0[100]; 3.5[010]; 8.5[001] 10-6/K
Optical Damage Threshold	20 GW/cm2
Optical Homogeneity	<1 x 10-5 dn/n
Peak Emission Cross Section	>3.8 x 10-19/cm2 @1067nm
Yong Modules	115.8[100], 152.5[010], 92.4[001]
Bend Limits	13.9[100], 10.2[010], 6.4[001] kg/mm
Solubility in Water	Insoluble
Lasing Wavelength	911nm,1067nm,1351nm
Peak Absorption Wavelength	811nm
Absorption Linewidth (FWHM)	4.5nm
Absorption coefficient ( 3% Nd)	20 cm-1

Standard Products

The standard product is cut along  [010], with an Nd concentration of 2-10 at %, a length of 50mm, and a diameter of 3, 4 or 5mm. AR, HR or PR coatings are available upon request.

Specifications on finished products

Diameter tolerance: +/-0.1mm

Length tolerance: +/-0.2mm

Surface quality: better than 10/5 Scratch/Dig per MIL-O-1380A

Parallelism: < 20 arc seconds

Perpendicularity: < 5 arc minutes

Surface flatness: < λ/10 at 632.8nm

Clear aperture: Central 95%

Chamfer: 0.15mm x 45deg