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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.

Properties of Nd:KGW laser crystal

Chemical Formula:

Nd^3+M:KG(WO4)₂

Crystal Structure:

Monoclinic; 2/m; l2/a

Lattice Constants:

a=8.087, b=10.374, c=7.588Å, β=94.4°

Melting Point:

1075°C; Phase transition to tetragonal form 1005 °C

Density:

7.27 g/cm³

Mohs Hardness:

Yong modules:

115.8[100], 152.5[010], 92.4[001]

Thermal Conductivity:

2.8[100]; 2.2[010]; 3.5[001] W/m/K

Nd:KGW Optical Properties

Transmission range:

350 ~5500nm

Refractive Index:

n_q= 2.049; n_p= 1.978; n_m = 2.014 @1067 nm

Lasing Wavelength:

911 nm 1067 nm 1351 nm

Peak Emission Cross Section:

>3.8 x 10-19/cm² @1067nm

Absorption Bands:

941 nm, 968.5 nm

Absorption bandwidth:

18nm for 940nm, 2nm for 969nm

Fluorescent lifetime::

110 µs (3% doping), 90 µs ( 8% doping)

Optical homogeneity:

1 x 10-5

Bend limits:

13.9[100], 10.2[010], 6.4[001] kg/mm

Solubility in water:

Insoluble

Optical damage threshold:

20 GW/cm²

General Specifications of Nd:KGW Laser Crystal

1) Orientation:

Custom specs, crystalline direction (+/-0.5°)

2) Max size:

Dia. 20 x 75mm

3) Surface quality:

better than 10/5 Scratch/Dig

4) Parallelism:

10 arc seconds

5) Perpendicularity:

5 arc minutes

6) Surface flatness:

λ/10 at 633 nm

7) Clear aperture:

Central 95%

8) Chamfer:

0.15mm @45°

9) Damage threshold:

over 20GW/cm² (without coating)

10) Coating:

AR, HR or upon customer's specification

i. Yb:YAG laser crystal

Request Nd:KGW Laser Crystal for Quote

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