Popular Design for Opa – Nd:YVO4 Crystal – WISOPTIC

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Popular Design for Opa – Nd:YVO4 Crystal – WISOPTIC Detail:

Nd:YVO₄ (Neodymium-doped Yttrium Vanadate) is one of the best commercially available material for diode-pumped solid-state lasers, especially for lasers with low or middle power density. For example, Nd:YVO₄ is a better choice than Nd:YAG for generating low-power beams in hand-held pointers or other compact lasers. In these applications, Nd:YOV₄has some advantages over Nd:YAG, e.g. high absorption of pumped laser irradiation and large stimulated emission cross section.

Nd:YVO₄ is a good choice for highly polarized output at 1342 nm, as the emission line is much stronger than those of its alternatives. Nd:YVO₄ is capable of working with some nonlinear crystals with high NLO coefficient (LBO, BBO, KTP) to generate lights from near infrared to green, blue, or even UV.

Contact us for the best solution for your application of Nd:YVO₄crystals.

WISOPTIC Capabilities – Nd:YVO₄

• Various options of Nd-doping ratio (0.1%~3.0at%)

• Various sizes (max diameter: 16×16 mm²; max length: 20 mm)

• Various coatings (AR, HR, HT)

• High processing accuracy

• Very competitive price, quick delivery

WISOPTIC Standard Specifications^* - Nd:YVO₄

Doping Ratio	Nd%=0.2%~3.0at%
Orientation Tolerance	+/- 0.5°
Aperture	1×1 mm²~16×16 mm²
Length	0.02 mm~20 mm
Dimension Tolerance	(W±0.1mm)×(H±0.1mm)×(L+0.5/-0.1mm) (L≥2.5mm) (W±0.1mm)×(H±0.1mm)×(L+0.2/-0.1mm) (L<2.5mm)
Flatness	< λ/8 @ 632.8 nm (L≥2.5mm) < λ/4 @ 632.8 nm (L<2.5mm)
Surface Quality	< 20/10 [S/D]
Parallelism	< 20”
Perpendicularity	≤ 5′
Chamfer	≤ 0.2 mm @ 45°
Transmitted Wavefront Distortion	< λ/4 @ 632.8 nm
Clear Aperture	> 90% central area
Coating	AR @ 1064nm, R< 0.1% & HT @ 808nm, T>95%; HR @ 1064nm, R>99.8% & HT@ 808nm, T>95%; HR @ 1064nm, R>99.8%, HR @ 532 nm, R>99% & HT @ 808 nm, T>95%
Laser Damage Threshold	> 700 MW/cm² for 1064nm, 10ns, 10Hz (AR-coated)
* Products with special requirement upon request.

20170814140547
ns-yv041
Nd-YVO4-1

DOWNLOAD Technical Data – Nd-YAG

Advantages of Nd:YVO₄ (compared with Nd:YAG)

• Wider pumping bandwidth around 808 nm (5 times that of Nd:YAG)

• Bigger stimulated emission cross-section at 1064nm (3 times that of Nd:YAG)

• Lower laser damage threshold and higher slope efficiency

• Different from Nd:YAG, Nd:YVO₄ is uniaxial crystal which gives linearly polarized emission, avoiding redundant thermally induced birefringence.

Laser Properties of Nd:YVO₄ vs Nd:YAG

Crystal	Doping（atm%）	σ (×10^-19cm²)	α (cm^-1)	τ (μs)	L_α (mm)	P_th(mW)	η_s(%)
Nd:YVO₄ (a-cut)	1.0	25	31.2	90	0.32	30	52
Nd:YVO₄ (a-cut)	2.0	25	72.4	50	0.14	78	48.6
Nd:YVO₄ (c-cut)	1.1	7	9.2	90	—	231	45.5
Nd:YAG	0.85	6	7.1	230	1.41	115	38.6
σ - stimulated emission cross-section, α - absorption coefficient, τ - fluorescent lifetime L_α -absorption length, P_th - threshold power, η_s - pump quantum efficiency

Physical Properties – Nd:YVO₄

Atomic density	1.26×10²⁰ atoms/cm²(Nd%=1.0%)
Crystal structure	Zircon tetragonal, space group D_4h-I4/amd a=b=7.1193 Å, c=6.2892 Å
Density	4.22 g/cm²
Mohs hardness	4.6~5 (glass-like)
Thermal expansion coefficient (300K)	α_a=4.43×10^-6/K, α_c=11.37×10^-6/K
Thermal conductivity coefficient (300K)	\|\|c: 5.23 W/(m·K); ⊥c: 5.10 W/(m·K)
Melting point	1820 ℃

Optical Properties – Nd:YVO₄

Lasing wavelength	914 nm, 1064 nm, 1342 nm
Refractive indices	positive uniaxial, n_o=n_a=n_b n_e=n_c n_o=1.9573, n_e=2.1652 @ 1064 nm n_o=1.9721, n_e=2.1858 @ 808 nm n_o=2.0210, n_e=2.2560 @ 532 nm
Thermal optical coefficient (300K)	dn_o/dT=8.5×10^-6/K, dn_e/dT=3.0×10^-6/K
Stimulated emission cross-section	25.0×10^-19cm² @ 1064 nm
Fluorescent lifetime	90μs (1.0at% Nd doped) @ 808 nm
Absorption coefficient	31.4 cm^-1 @ 808 nm
Absorption length	0.32 mm @ 808 nm
Intrinsic loss	0.02 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%
Polarized emission	Polarized

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