YVO4 Laser Crystals
YVO4 Birefringent Crystal for Polarizing Optics
YVO4 crystal, or undoped yttrium orthovanadate, is a positive uniaxial birefringent crystal grown by the Czochralski method. It is widely used in optical isolators, circulators, beam displacers, interleavers, polarizers, and other precision polarization-control components for fiber-optic and laser optical systems.
YVO4 offers a broad transmission range, large birefringence, non-hygroscopic handling, and better mechanical stability than calcite in many optical component designs. It is often selected as a synthetic birefringent material when compact beam separation, polarization management, and stable optical performance are required.
ATR Crystal supplies custom YVO4 birefringent crystals with specified orientation, dimensions, bevel, surface quality, wavefront distortion, AR/HR coating, clear aperture, and inspection requirements. For related materials, review our birefringent crystal category, Nd:YVO4 laser crystal, and laser crystal category.
Applications of YVO4 Birefringent Crystal
Fiber-optic isolators and circulators
Beam displacers and polarization beam separation optics
Optical interleavers and polarization-control components
Glan-type polarizers and custom polarizing assemblies
Laser optical systems requiring stable birefringent components
OEM fiber-optic modules and custom optical instrument designs
Advantages of YVO4 Crystal
- Large birefringenceYVO4 provides large birefringence, enabling compact beam displacement and effective polarization separation.
- Broad transmission rangeYVO4 has high transmission from about 0.4 to 5 um, making it useful across visible, near-infrared, and telecom wavelength bands.
- Positive uniaxial crystalThe optical properties of YVO4 make it suitable for beam displacers, isolators, circulators, and precision polarization-control optics.
- Non-hygroscopic handlingUnlike moisture-sensitive materials, YVO4 is non-hygroscopic and easier to handle in practical optical assembly environments.
- Good mechanical stabilityYVO4 is more robust than calcite in many OEM optical component designs, while still offering useful birefringence.
- Custom orientation and coatingCut angle, dimensions, surface quality, wavefront distortion, AR/HR coating, and clear aperture can be specified for the optical design.
Specifications of YVO4 Birefringent Crystal
The following values summarize typical YVO4 crystal processing specifications for optical component design. Final values should be confirmed according to drawing, orientation, coating, and inspection requirements.
| Parameter | Typical Value / Option |
|---|---|
| Material | Undoped YVO4 / yttrium orthovanadate |
| Dimension tolerance | +/-0.1 mm |
| Flatness | lambda/10 at 632.8 nm |
| Wavefront distortion | lambda/4 at 632.8 nm |
| Surface quality | 10/5 per MIL-O-13830B |
| Parallelism | <= 10 arcsec |
| Perpendicularity | <= 10 arcmin |
| Bevel / chamfer | <0.1 mm at 45 degrees |
| Chips | <0.1 mm |
| Clear aperture | >95% |
| Coating | AR or HR coating; IAD, EB, or IBS coating upon customer request |
| Damage threshold | About 750 MW/cm2 at 1064 nm, TEM00, 10 ns, 10 Hz; confirm test conditions for final specification |
| Quality warranty period | One year under proper use, subject to final sales terms |
YVO4 vs. Other Birefringent Crystals
YVO4 is often compared with rutile, calcite, and lithium niobate for polarization optics. The table below keeps the original comparison values and normalizes unit wording.
| Property | YVO4 | TiO2 | CaCO3 | LiNbO3 |
|---|---|---|---|---|
| Thermal expansion, c-axis | 11.4 x 10^-6/C | 9.2 x 10^-6/C | 26.3 x 10^-6/C | 16.7 x 10^-6/C |
| Thermal expansion, a-axis | 4.4 x 10^-6/C | 7.1 x 10^-6/C | 5.4 x 10^-6/C | 7.0 x 10^-6/C |
| Ordinary refractive index | no = 1.9447 at 1550 nm | no = 2.454 at 1530 nm | no = 1.6346 at 1497 nm | no = 2.2151 at 1440 nm |
| Extraordinary refractive index | ne = 2.1486 at 1550 nm | ne = 2.710 at 1530 nm | ne = 1.4774 at 1497 nm | ne = 2.1413 at 1440 nm |
| Birefringence, ne – no | 0.2039 at 1550 nm | 0.256 at 1530 nm | -0.1572 at 1497 nm | -0.0738 at 1440 nm |
| Mohs hardness | 5 | 6.5 | 3 | 5 |
| Deliquescence | None | None | Weak | None |
| Transparency range | 0.4-5 um | 0.4-5 um | 0.35-2.3 um | 0.4-5 um |
Basic Properties of YVO4 Crystal
Typical physical and optical properties for YVO4 crystal component design.
| Property | Typical Value |
|---|---|
| Transparency range | High transmission from 0.4 to 5 um |
| Crystal symmetry | Zircon tetragonal, space group D4h |
| Crystal cell | a = b = 7.12 A, c = 6.29 A |
| Density | 4.22 g/cm3 |
| Mohs hardness | 5 |
| Hygroscopic susceptibility | Non-hygroscopic |
| Thermal expansion coefficient | alpha a = 4.43 x 10^-6/K; alpha c = 11.37 x 10^-6/K |
| Thermal conductivity coefficient | //C: 5.23 W/(m K); perpendicular C: 5.10 W/(m K) |
| Thermal optical coefficient | dna/dT = 8.5 x 10^-6/K; dnc/dT = 3.0 x 10^-6/K |
| Crystal class | Positive uniaxial, with no = na = nb and ne = nc |
Refractive Indices, Birefringence and Walk-Off Angle
Typical refractive-index and walk-off values for YVO4 crystal at common wavelengths.
| Wavelength | no | ne | Birefringence, ne – no | Walk-Off Angle at 45 degrees |
|---|---|---|---|---|
| 630 nm | 1.9929 | 2.2154 | 0.2225 | 6.04 degrees |
| 1300 nm | 1.9500 | 2.1554 | 0.2054 | 5.72 degrees |
| 1550 nm | 1.9447 | 2.1486 | 0.2039 | 5.69 degrees |
Sellmeier Equations for YVO4
Sellmeier equations are useful for optical design calculation. Wavelength lambda is in micrometers.
| Index | Equation |
|---|---|
| Ordinary index | no^2 = 3.77834 + 0.069736/(lambda^2 – 0.04724) – 0.0108133 lambda^2 |
| Extraordinary index | ne^2 = 4.59905 + 0.110534/(lambda^2 – 0.04813) – 0.0122676 lambda^2 |
YVO4 and Related Optical Crystal Options
YVO4 is mainly used as an undoped birefringent optical crystal. If the project requires a laser gain medium, a doped crystal such as Nd:YVO4, Nd:YAG, or Yb:YAG should be reviewed instead.
| Material | Material Type | Main Use | Selection Note |
|---|---|---|---|
| YVO4 | Undoped birefringent crystal | Isolators, circulators, beam displacers, polarizers, interleavers | Chosen for high birefringence, broad transmission, and stable handling |
| Nd:YVO4 | Doped laser gain crystal | Compact DPSS lasers, 1064 nm and 532 nm systems | Chosen for high pump absorption and low laser threshold |
| Nd:YAG | Doped laser gain crystal | 1064 nm CW, pulsed, and Q-switched lasers | Chosen for mature processing and good thermal/mechanical properties |
| Yb:YAG | Doped laser gain crystal | 1030 nm high-power and ultrafast lasers | Chosen for diode-pumped power scaling and low fractional heating |
| Calcite | Natural birefringent crystal | Polarizers and beam displacers | Classic material, but more fragile and limited in transmission range |
| Rutile | Birefringent crystal | Compact high-birefringence optics | Very high refractive index and birefringence, but processing can be more challenging |
How to Specify YVO4 Optical Components
YVO4 component design should be specified according to wavelength, polarization behavior, required beam displacement, optical axis orientation, aperture, coating, surface quality, and allowable wavefront distortion. For beam displacers and isolator optics, the design should also consider walk-off angle, crystal length, input beam diameter, and assembly geometry.
If your application requires laser emission from the crystal itself, use Nd:YVO4 laser crystal rather than undoped YVO4. If your application requires only polarization separation or birefringent optical control, undoped YVO4 is the correct material category.
YVO4 RFQ Checklist
Providing the following information helps ATR Crystal review the design and quote more accurately.
| RFQ Item | Information to Provide |
|---|---|
| Application | Beam displacer, isolator, circulator, interleaver, polarizer, or custom birefringent optic. |
| Wavelength range | Operating wavelength, bandwidth, laser power, and transmission requirement. |
| Geometry | Length, width, thickness, aperture, bevel, wedge, prism or slab shape, and drawing if available. |
| Optical axis | Cut direction, optical axis orientation, beam path, polarization direction, and required walk-off behavior. |
| Surface and coating | Surface quality, flatness, wavefront distortion, AR/HR coating, coating wavelength, and reflectivity target. |
| Order information | Prototype quantity, batch quantity, inspection criteria, packaging requirement, and delivery schedule. |
