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Nd:KGW Laser Crystal

Neodymium doped Potassium-Gadolinium Tungstate crystals (Nd:KGd(WO4)2 or Nd:KGW) are low-threshold high effective laser medium exceptionally suitable for laser rangefinders. The efficiency of such lasers is 3 - 5 times better than that of the Yttrium-Aluminium Garnet (YAG) lasers. At low pumping energies (0.5 to 1.0 J) KGW crystals are one of the few materials ensuing an effective generation. KGW single crystals can also be used for the fabrication of high-efficiency lasers with high output energy. The single crystals exhibit a high optical quality. KGW crystals have great value of the bulk strength for laser radiation.

Nd:KGW Crystal

Nd:KGW Physical and Optical Properties

Chemical Formula: Nd:KG(WO4)2
Structure symmetry: Monoclinic; 2/m; l2/a
Lattice constants: a=8.087, b=10.374, c=7.588, 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 ~5500nm
Refractive index [1067nm, 25°C]: nq = 2.049; np = 1.978; nm = 2.014
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
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: 911 nm 1067 nm 1351 nm

Nd:KGW General Specifications

1) Diameter: 20mm max
2) Length: 75mm max
3) Surface Quality: better than 10/5 scratch/dig
4) Parallelism: 20 arcsec.
5) Perpendicularity: 5 arc minutes
6) Optical Axis Orientation: +/- 0.5°
7) Surface Flatness: λ/10 @633nm
8) Transimission Wavfront Distortion: λ/4 @633nm
9) Coating: AR, HR or upon customer's specification


1. Nd:KGW Laser Crystal

2x2x5 mm Nd:KGW Laser Crystal


3x3x5 mm Nd:KGW Laser Crystal


5x5x7 mm Nd:KGW Laser Crystal


6x6x10 mm Nd:KGW Laser Crystal


3x3x20 mm Nd:KGW Laser Crystal


Additional message: qty. coating, holder...


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