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Undoped YVO₄ (Yttrium Orthovanadate) is a premium birefringent crystal used in fiber-optic isolators and wedges. It is prized for its exceptionally high birefringence, wide transparency range, and excellent mechanical properties, making it an ideal, durable replacement for traditional crystals like calcite.

Key Optical Properties

Understanding the foundational parameters of pure, undoped YVO₄ is critical for designing isolators and wedges.

Property	Specification / Value
Transparency Range	400 nm to 5000 nm
Crystal Structure	Uniaxial Positive, Zircon Tetragonal
Birefringence ( $delta n$ )	~0.22 at 1550 nm (Large)
Refractive Index	$n sub o$ = 1.95, $n sub e$ = 2.16 (at 1550 nm)
Mohs Hardness	5.0 (Glass-like, easy to fabricate)
Density	4.22 g/cm³
Damage Threshold	Very high

Massive Birefringence: YVO₄ boasts one of the largest birefringence values of any commonly used crystal (
). This allows for the creation of incredibly compact components (like micro-isolators) because a shorter physical crystal length is required to achieve the necessary spatial beam walk-off or phase delay.
Synthetic Alternative to Calcite: Compared to calcite (
$CaCO sub 3$
), YVO₄ is completely insoluble in water and significantly harder. This translates to higher durability, easier polishing, and much better yields during manufacturing.
Superior to Rutile: While rutile (
$TiO sub 2$
) also features high birefringence, YVO₄ is vastly easier and less expensive to grow in large, high-quality, defect-free boules.
Wide Wavelength Adaptability: Its broad transmission window means it is highly effective across the typical optical communication bands (e.g., 1310 nm and 1550 nm) up into the near-IR and visible spectrums.

Polarization Beam Displacers (PBDs): Separates an unpolarized beam into two parallel, orthogonally polarized beams.
Optical Isolators: YVO₄ wedges are used in conjunction with Faraday rotators to prevent back-reflections from damaging sensitive laser sources.
Optical Circulators & Interleavers: Utilizes the large birefringent walk-off to route light in multiple directions.
Glan-Taylor / Wollaston Prisms: Pure YVO₄ can be cut and paired to create highly efficient polarizing prisms.

YVO4 crystal, Beam displacer, Wedge, undoped Yttrium Orthovanadate
Undoped Yttrium Orthovanadate (YVO4) crystals are used as polarization beam displacers because of their large birefringence. They ...
OptoCity
Undoped YVO4 crystal - dientech.com
Undoped YVO4 crystal. Undoped YVO 4 crystal is an excellent newly developed birefringence optical crystal and widely used in many ...
Design,Grow and Manufacture Pure YVO4 for 20 years in China
YVO4 crystal produced by Photonchina is mainly used to manufacture Birefringent Wedge of optical isolator and Beam Displacer (BD) ...
Photonchina

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Web results

YVO4 crystal Yttrium Orthovanadate

HG Optronics.,INC.

https://www.hgoptronics.com › yvo4-crystal-yttrium-or...

HG Optronics.,INC.

https://www.hgoptronics.com › yvo4-crystal-yttrium-or...

Yttrium Orthovanadate (YVO4) is ideal for optical polarizing components and in many applications including fiber optic isolators and circulators, interleavers, ...Read more

YVO4 Crystal, Beam Displacer & Wedge

OptoCity

http://www.optocity.com › YVO4

OptoCity

http://www.optocity.com › YVO4

YVO4 crystal, undoped Yttrium Orthovanadate, is widely used as polaizing beam displacer (YVO4 Slab or Wedge) because of its large birefringence. YVO4 ...Read more

Your source for BBO, LBO, BiBO, KTP, KTA, Nd:YAG, ...

Newlight Photonics Inc.

https://www.newlightphotonics.com › pure-YVO4

Newlight Photonics Inc.

https://www.newlightphotonics.com › pure-YVO4

Undoped Yttrium Vanadate (YVO4) Crystals. Pure YVO4 crystal is a positive uniaxial crystal with a wide transparency range in infrared, a large birefringence ...Read more

Undoped YVO4 Crystals and Components

ulticrystal.com

https://ulticrystal.com › yvo4_crystals

ulticrystal.com

https://ulticrystal.com › yvo4_crystals

PDF

It is an excellent synthetic substitute for Calcite (CaCO3) and Rutile (TiO2) crystals in many applications including fiber optic isolators and circulators,.Read more

Nd:YVO4

Laserstates

https://laserstates.com › Nd-YVO4

Laserstates

https://laserstates.com › Nd-YVO4

Nd:YVO4 (Neodymium Doped Yttrium Orthovanadate) is the most efficient laser host crystal for diode pumping among the current commercial laser crystals.Read more

YVO₄ - Yttrium Orthovanadate-CASTECH INC. _A Leading ...

castech.com

https://www.castech.com › product › YVO4---Yttrium-O...

castech.com

https://www.castech.com › product › YVO4---Yttrium-O...

Large quantity YVO4 wedges and displacers used for fiber optical isolators and circulators, interleavers, in size of 1.25 x 1.25 x 0.5 mm³ to 3 x 3 x 15 mm³ ...Read more

MSE PRO YVO4 Undoped Yttrium Orthovanadate Crystal

MSE Supplies

https://www.msesupplies.com › products › mse-pro-yvo-...

MSE Supplies

https://www.msesupplies.com › products › mse-pro-yvo-...

Undoped YVO4 is an excellent newly developed birefringence optical crystal. It has very good transmission in a wide wavelength range from visible to ...

$41.36with code

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Undoped Yttrium Orthovanadate Crystal - Hgoptronics.com

hgoptronics.com

https://www.hgoptronics.com › undoped-yttrium-ortho...

hgoptronics.com

https://www.hgoptronics.com › undoped-yttrium-ortho...

The Yttrium Orthovanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method. It has good temperature stability and physical and mechanical ...Read more

Yb:YVO4 – small quantity or mass production all available

Photonchina

https://www.photonchinaa.com › Crystal Optics

Photonchina

https://www.photonchinaa.com › Crystal Optics

Yb:YVO4, Ytterbium-doped Yttrium Orthovanadate, is a crystalline solid used as an active laser-gain medium. It is an excellent working crystal material for ...Read more

Neodymium Doped Yttrium Orthovanadate (Nd:YVO4) ...

Fuzhou MT Optics,Inc.

https://www.mt-optics.net › Laser Crystals