Basic Properties

Atomic Density

~1.37x1020 atoms/cm²

Crystal Structure

Zircon Tetragonal, space group D_4h, a=b=7.118, c=6.293

Density

4.22 g/cm²

Mohs Hardness

Glass-like, 4.6 ~ 5

Thermal Expansion Coefficient

α_a=4.43x10^-6/K,α_c=11.37x10^-6/K

Melting Point

1810 ± 25℃

Lasing Wavelengths

914nm, 1064 nm, 1342 nm

Thermal Optical Coefficient

dn_a/dT=8.5x10^-6/K, dn_c/dT=3.0x10^-6/K

Stimulated Emission Cross-Section

25.0x10^-19 cm² , @1064 nm

Fluorescent Lifetime

90 ms (about 50 ms for 2 atm% Nd doped) @ 808 nm

Absorption Coefficient

31.4 cm^-1 @ 808 nm

Absorption Length

0.32 mm @ 808 nm

Intrinsic Loss

Less 0.1% cm^-1 , @1064 nm

Gain Bandwidth

0.96 nm (257 GHz) @ 1064 nm

Polarized Laser Emission

parallel to optic axis (c-axis)

Diode Pumped Optical to Optical Efficiency

> 60%

Sellmeier Equation (for pure YVO4 crystals)

n_o²(λ) =3.77834+0.069736/(λ² - 0.04724) - 0.0108133λ²
n_o²(λ) =4.59905+0.110534/(λ² - 0.04813) - 0.0122676λ²

Technical Parameters

Nd dopant concentration

0.2 ~ 3 atm%

Dopant tolerance

within 10% of concentration

Length

 0.02 ~ 20mm

Coating specification

AR @ 1064nm, R< 0.1% & HT @ 808nm, T>95%
HR @ 1064nm, R>99.8% & HT@ 808nm, T>9%
HR @ 1064nm, R>99.8%, HR @ 532 nm, R>99% & HT @ 808 nm, T>95%

Orientation

a-cut crystalline direction (+/-5℃)

Dimensional tolerance

+/-0.1mm(typical), High precision +/-0.005mm can be available upon request.

Wavefront distortion

<λ/8 at 633nm

Surface quality

better than 20/10 Scratch/Dig per MIL-O-1380A

Parallelism

< 10 arc seconds

Perpendicularity

< 5 arc minutes

Surface flatness

<λ/10 at 632.8nm

Clear aperture

Central 95%

Chamfer

0.15x45^o

Damage threshold

over 15J/cm² (rods without coating) over 700 MW/cm² (coating)