BaF2 Cross-Polarized Wave (XPW) Crystals

Orientation

Thickness

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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
540-7110	[011]	1.0 mm	10x10 mm	198 $	4 - 5 days
540-7115	[011]	1.5 mm	10x10 mm	198 $	4 - 5 days
540-7120	[011]	2.0 mm	10x10 mm	198 $	4 - 5 days
540-7125	[011]	2.5 mm	10x10 mm	198 $	4 - 5 days
540-7130	[011]	3 mm	10x10 mm	198 $	4 - 5 days

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
540-7110M	[011]	1.0 mm	10x10 mm	253 $	Request
540-7115M	[011]	1.5 mm	10x10 mm	253 $	Request
540-7120M	[011]	2.0 mm	10x10 mm	253 $	Request
540-7125M	[011]	2.5 mm	10x10 mm	253 $	Request
540-7130M	[011]	3 mm	10x10 mm	253 $	Request

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

EKSMA Optics BaF2 Crystals
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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.

BaF2 Optical Crystals for Cross Polarized Wave Generation

BaF2 Optical Crystals for Cross Polarized Wave Generation

BaF2 Optical Crystals for Cross Polarized Wave Generation

BaF2 Optical Crystals for Cross Polarized Wave Generation

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