Nd: GdVO4
Nd:GdVO4 Crystal (Neodymium-doped gadolinium orthovanadate) acts as a good gain medium in lasers. The output wavelength of Nd: GdVO4 Crystal is mainly concentrated in 1060nm and 1340nm. Nd: VO4 Crystal is well known in the solid laser field for its high chemical stability and its excellent laser performance. But it cannot be used in high power laser field because of its thermal conductivity coefficient is not high. Compared with Nd: VO4 Crystal, It not only has many advantages of Nd: VO4 Crystal, but also makes up for the shortage of Nd: VO4 Crystal in the field of high-power laser due to its relatively high thermal conductivity. It has a very good development prospect.
The Nd: GdVO4 Crystal is used as the gain medium and the wavelength is 1520nm for human eye safe laser motion in ranging, telemetry and other remote sensing applications.
The field of human eye security is between 1500nm to 1600nm. By the research of Raman scattering, it is found that the self-frequency Raman laser can move to 1174nm-1175nm. Therefore, Nd: GdVO4 Crystal under pull-diffuse reflection can realize the development of a human eye safety laser with a wavelength of 1340nm and 1520nm. Such a laser can be widely used in various remote sensing applications and has a good development prospect
- Large absorption coefficient and absorption band width, with small dependence on pump wavelength;
- Good thermal conductivity
- Low laser threshold and high efficiency of laser output slope
- High laser damage threshold
- Good polarization of laser output
- 1520nm laser is used for telemetry
- 1520nm laser is used for ranging
- 1520nm laser is used for remote sensing applications
Parameter
| Crystal Structure | tetragonal |
| Space Group | I41/amd |
| Density | 5.47g/cm3 |
| Specific Heat @25oC | 32.6 (cal/mol/K ) |
| Mohs Hardness | 4.6 – 5 |
| Melting Point | 1780 oC |
| Thermal Conductivity, W/(mxK): <110> | 11.7Wm/K |
| Thermal Expansion Coefficient | αa=1.5x10E-6/K, αc=7.3x10E-6/K |
| Lattice Parameter (A) | a=7.21b=6.35 |
| Nd: Dopant Level | 0.1 – 3.0 atm% |
| Standard Dimensions | 4x4x8mm,3x3x5mm3,3x3x3 mm3, 3x3x1 mm3 |
| Wavefront Distortion | < l/8 at 633 nm |
| Orientation | +/-0.5deg. |
| Surface quality | 10/5 Scratch/Dig per MIL-O-13830B |
| Flatness | l/10 at 633 nm |
| Clear Aperture | > Central 90% |
| Parallelism | < 10 arc sec. |
| Intrinsic Loss | < 0.1% cm-1 |
| Lasing Transition | 4F3/2 – 4I1/2 |
| Lasing Wavelength | 1062.9 nm, 1340.0 nm |
| Emission Cross Section, (E ½ ½ c, at 1064 nm) | 7.6×10-19cm² |
| Peak Absorption Wavelength | 808nm |
| Absorption Cross Section, (E ½ ½ c, at 808 nm) | 4.9×10-19cm² |
| Absorption Linewidth | 3 nm |
| Relaxation Time of Terminal Lasing Level | 100 µs |
| Absorption Coefficient (1% Nd) | 57 cm-1 with E//c @ 808 nm |
| Index of Refraction (at 1064 nm): | no=1.972 ne=2.192 |
Leave a Reply