Paired BiBO Crystals

Two identical Type I SPDC crystals mounted with one crystal rotated by 90o
about the axis normal to the crystal face. Two principal axes aligned in
perpendicular planes.
Optically contacted structure with no optical cement in the beam path.
Standard half opening angle between signal/idler: 3^o
Pump wavelength range: 350 - 780 nm.
Common pumps: ~ 390 - 410 nm, ~ 355 nm.
Common aperture size: 5x5 mm or 8x8 mm. OD 1" mounted.

Aplication Example:

Paired BiBO crystals for an ultrabright polarization-entangled photon source

wavelength

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Model	Name	wavelength	material	Price	Availability	Action
PABiBO5050-405(I)-HA3	Paired BiBO crystals, size 5x5x0.5mm(each), cut for Type I SPDC pumped by 405nm with the half opening angle of 3°, AR@810/405nm. The two crystals are optically contacted with one crystal rotated by 90 degrees about the axis normal to the crystal face.	Pump: 405nm	SPDC Crystal	Ask
PABiBO5050-355(I)-HA3	Paired BiBO crystals, size 5x5x0.5mm(each), cut for Type I SPDC pumped by 355nm with the half opening angle of 3°, AR@355/710nm. The two crystals are optically contacted with one crystal rotated by 90 degrees about the axis normal to the crystal face. M	Pump: 355nm	SPDC Crystal	Ask
PABiBO5050-435(I)-HA3U	Paired BiBO crystals, size 5x5x0.5mm(each), cut for Type I degenerate SPDC pumped by 435nm with the half opening angle of 3 degrees, Uncoated. The two crystals are optically contacted with one crystal rotated by 90 degrees about the axis normal to the cry	Pump: 435nm	SPDC Crystal	Ask

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Specifications of BiBO SPDC crystals:

Wavefront distortion:	less than λ/8 @ 633 nm
Clear aperture:	> 90% central area
Flatness:	λ/8 @ 633 nm
Scratch/Dig:	10/5 to MIL-O-13830A
Parallelism:	better than 20 arc seconds
Angle tolerance:	Δθ < +/-0.25o, Δφ < +/-0.25o

Coating:

Dual AR@405/810 nm for 405 nm pumped SPDC crystals,

Uncoated for pumps other than 405 nm unless the coating otherwise specified.

Coatings:

405 nm Pump: Multilayer AR coating AR@405/810 nm on input/output surfaces
Pumps other than 405 nm: Uncoated on input/output surfaces

* Multilayer AR coatings at the specified wavelengths are available upon request.