Low Energy Lamp Pumping
Doped with Nd, this crystal is a low-threshold, high efficiency, active medium. KGW has an efficiency approximately twice that of Nd:YAG, and an energy capacity of 0.1J/cm3.
Efficient Stimulated Raman Scattering
This high efficiency material for SRS lasers ensures extremely low SRS thresholds in the picosecond generation mode, makes possibility SRS self-transformation with the following wavelength generation: 0.94, 1.18, 1.32 m m with s variable pulse duration within the range of 0.9 - 10 picoseconds.
Efficient LD pumping
The broad pump bandwidth centered at 810 nm allows operation at a wide range of temperatures and laser diode specifications. Together with its high peak cross-section, a direct pump geometry is possible. That makes possible the construction of chip lasers.
Nd: KGW Properties
| Formula | KGd(WO4)2 |
| Structure symmetry | monoclinic, 2/m, 12/a |
| Lattice constant, (A) | a=8.10, b=10.43, c=7.60, b =94.40 |
| Melting point, (ºC) | 1,075 |
| Phase transition to tetragonal form (ºC) | 1,005 |
| Hardness, Mohs | 4 |
| Density, g/cm3 | 7.27 |
| Thermal conductivity (W× m-1× K-1) | 2.6[100], 3.8[010], 3.4[001] |
| Thermal expansion (10-6× K-1) | 4.0[100], 3.6[010], 8.5[001] |
| Transmission range (m m) | 0.35 - 5.5 |
| Refractive index @ 1.067m m | np=1.978, nm=2.014 |
| Optical damage threshold (GW× cm2) | >3.8 @ 1067.2nm |
| Optical homogeneity, delta n/n | <1x10-5 |
| Fluorescent lifetime (m sec) | 80 - 130 |
| Young's modules | 115.8[100], 152.5[010], 92.4[001] |
| Bend limits (kg/mm) | 13.9[100], 10.2[010], 6.4[001] |
| Solubility in water | insoluble |
Nd:KGW Laser Properties
4F3/2® 4I11/2 Channel
Laser wavelength, [m m]............................................. 1.0672
SRS self-conversion..................................................... S1=1.1805
..................................................... S2=1.3207
..................................................... S3=1.73
................................................... AS1=0.973
4F3/2® 4I13/2 Channel
Laser wavelength, [m m].............................................. 1.351
SRS Self-conversion..................................................... S1=1.54
4F3/2® 4I9/2 Channel
Laser wavelength, [nm].............................................. 911
Ground State Absorption Properties
Diode pump peak wavelength, [nm]........................... 810.0
FWHM@ 810 nm line, [nm]........................................... 4.5
Absorption coefficient @ 3 at% Nd[cm-1]................... 20
KGW rod standard specification*
| Orientation | [010] + 2 degrees |
| Parallelism (arc sec) | <30 |
| Nd concentration (at%) | 1 - 8 |
| Diameter (mm) | 2 - 8 |
| Diameter tolerance (mm) | +0.0/-0.1 |
| Length (mm) | 1 - 80 |
| Length tolerance (mm) | +0.5/-0.5 |
| Chamfer (mm) | 0.2 |
| Perpendicularity (arc min) | <10 |
| Surface flatness (wave) | <l /8 |
| Surface quality (scratch/dig) | 20/10 |
*AR, HR, HT coatings are available
Crystal Comparison
| Crystal | %Nd [1020 cm3] |
Life time [ms] |
Abs. coeff. a, [cm-1] | Sabsorption (808nm) [10-20cm2] | FWHM absorption [nm] | Semission [10-20cm2] | FWHMemission [nm] |
| Nd:YAG | 1.5 |
240 |
10 |
7.0 | 0.8 | 33 | 0.5 |
| Nd:GVO | 1.5 |
90 |
7.8 |
5.1 | 1.5 | 76 | 1.3 |
| Nd(10%)LSB | 5.1 |
118 |
36 |
7.1 | 3 | 13 | 4 |
| Nd(8%)KGW | 5.3 |
80 |
58 |
11 | 4.5 | 40 | 1 |
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