Photorefractive Crystals: SBN-75

Photorefractive Crystals: SBN-75


Photorefractive Crystals: SBN-75

SBN-75 (Strontium Barium Niobate) is a photorefractive crystal similar to SBN-60, but with a different composition ratio of strontium, barium, and niobium. SBN-75 has a ratio of 75:25:1, which results in different optical properties compared to SBN-60.

Like SBN-60, SBN-75 exhibits strong photorefractive properties, making it useful in holography, optical storage, and optical phase conjugation applications. However, SBN-75 has some advantages over SBN-60 in certain applications.

One advantage of SBN-75 is its higher photorefractive sensitivity, which allows for faster response times in applications such as holographic data storage. SBN-75 also has a higher photorefractive damage threshold than SBN-60, which makes it more suitable for high-power laser applications.

SBN-75 is also useful for applications such as self-pumped phase conjugation, where it can be used to correct for distortions in laser beams caused by atmospheric turbulence or other factors. In this application, SBN-75 acts as a self-pumped phase conjugate mirror, reflecting the incoming laser beam back onto itself with a phase reversal that cancels out any distortions.

Overall, SBN-75 is a valuable photorefractive crystal for a variety of optical applications, with advantages such as higher sensitivity and higher damage threshold compared to SBN-60. Its photorefractive properties make it useful in holography, optical storage, and optical phase conjugation, and it is a promising candidate for high-power laser applications.

SBN x=0.75
Crystal Structure
Lattice(Cell) Parameters, Å
a = 12.43024, c = 3.91341
Transmission Range, µm
0.35 - 6.0
Refractive Index at 0.63µm
ne = 2.35, no = 2.37 @0.51µm
Electro-Optic Coefficient r41, pm/V
r13=67, r33=1340
Optical Activity, deg/mm at 500 nm
- deg/mm at 600 nm
Density, g/cm3
Mohs Hardness
Melting Point, C
1500 ± 10°C
Dielectric Constant
Dark Resistance, Ohm cm
Absorption coefficient @0.44µm
Thermal conductivity @25°C
0.006 W/cm*K
0.008 W/cm*K
Thermo-optic coefficient dne/dT
Curie temperature
Half wave Voltage
48 V

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