BaF2 Optical Crystals for Cross Polarized Wave Generation

Cross-Polarized Wave (XPW) generation is a nonlinear third order process during which fundamental and generated waves have the same frequency; however, generated wave is perpendicularly polarized to pump wave polarization. Phase matching occurs over large bandwidth in XPW generation process. This means the same phase and group velocities for fundamental wave and XPW.

Cross-polarized wave (XPW) generation process is driven by the third order nonlinearity of the crystal,  and the anisotropy  of the  sensor.

The typical optical material used for cross-polarized wave (XPW) generation is Barium Fluoride (BaF2) crystal with z ([001]) or holographic ([011]) crystallographic orientation. Theory predicts a maximum XPW energy conversion efficiency around 35% when using [011]-cut BaF2 crystal with a concomitant pulse shortening factor of √3 corresponding to a pure third-order nonlinear process[1].
 

EKSMA OPTICS offers [011] orientation BaF2 optical crystals (XPW crystals) for Cross-Polarized Wave (XPW) generation. BaF2 optical crystals with orientation [001] as well CaF2 optical crystals are available on request.

Delivery

Estimated delivery time: from 4 - 5 days

Orientation
Thickness
Size

Unmounted BaF2 Optical Crystals

Code Orientation Thickness Size Price Delivery Add to cart
540-7105 [011] 0.5 mm 10x10 mm 198 $ 4 - 5 days To cart
540-7110 [011] 1.0 mm 10x10 mm 198 $ 4 - 5 days To cart
540-7115 [011] 1.5 mm 10x10 mm 198 $ 4 - 5 days To cart
540-7120 [011] 2.0 mm 10x10 mm 198 $ 4 - 5 days To cart
540-7125 [011] 2.5 mm 10x10 mm 198 $ 4 - 5 days To cart
540-7130 [011] 3 mm 10x10 mm 198 $ 4 - 5 days To cart

BaF2 Optical Crystals mounted in Open Ring Holders

Code Orientation Thickness Size Price Delivery Add to cart
540-7105M [011] 0.5 mm 10x10 mm 253 $ Request To cart
540-7110M [011] 1.0 mm 10x10 mm 253 $ Request To cart
540-7115M [011] 1.5 mm 10x10 mm 253 $ Request To cart
540-7120M [011] 2.0 mm 10x10 mm 253 $ Request To cart
540-7125M [011] 2.5 mm 10x10 mm 253 $ Request To cart
540-7130M [011] 3 mm 10x10 mm 253 $ Request To cart
Delicious

Characteristics of the different Cross Polarized Wave (XPW) crystals at 2.1 µm [2]

  BaF2 CaF2 CVD-Diamond
Orientation h-cut [011] h-cut [011] z-cut [001]
Length, mm 2 2 1.2
n 1.464 1.426 2.383
(10-22 m2/V2) 1.53 0.94 11
σ -1.2 -0.6 -1.8
GVD (fs2/mm) -6 -27 63

[1] L. Canova, S. Kourtev, N. Minkovski, A. Jullien, R. Lopez-Martens, O. albert, and S.M. Saltiel, Appl. Phys. Lett. 92, 231102 (2008)

[2] Ricci, A., Silva, F., Julline, A., Cousin, S. L., Austin, D. R., Biegert, J., Lopez-Martens, R. Generation of High-Fidelity few-cycle pulses at 2.1 µm via cross-polarized wave generation. Optics Express 9711, 2013.04.22. Vol. 21, No. 8. DOI:10.1364/OE.21.009711

 

 

Physical Properties

Crystal type

cubic

Density, g/cm3

5.27

Melting point, °C

1525

Refractive index @ 0.265 µm

n = 1.51217

Refractive index @ 10.3 µm

n = 1.39636

Transmission band, µm

0.135-15

 

Specifications

Material

BaF2

Surface quality

60-40 scratch & dig (MIL-PRF-13830B)

Clear aperture

90% of diameter

Diameter tolerance

+0.0 -0.25 mm

Thickness tolerance

0.2 mm

Parallelism

3 arcmin

Flatness

λ/2 @ 633 nm

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