• Quarter-wave or half-wave retardance
• Broader wavelength bandwidth than common waveplates (Maximum 2000-15000nm)
• Three types of materials are optional: BK7, UV Fused Silica and ZnSe
• Half-wave prisms constructed by two quarter-wave prisms cemented together
• Customized specifications and modules are available upon request
A Fresnel Rhomb Retarder is a kind of optical retarder that produces a phase delay of λ/2 or λ/4 utilizing internal reflection. A Fresnel Rhomb is made from non-birefringent material and induces the desired phase delay using the principle of total internal reflections. Because virtually the retardation given by a Fresnel rhomb depends solely on the refractive index and the geometries of the prism, and the refractive index varies only slightly against a certain wavelength range, the independence of retardation over wavelength range is significantly greater, thus achieving exceedingly flat retardation throughout a broad wavelength range, which could have been impossible with the case of broadband waveplates made by birefringent materials. This kind of broadband retarder is suitable for applications in diode and fiber applications, broadband, multi-line, or tunable laser sources.
Shalom EO’s Fresnel Rhombs are shaped into parallelogram-based prisms, and the geometries of the rhombs are tightly controlled, so that each reflection produces exactly a retardation 1/8 wavelength between the two orthogonal polarization components, resulting in a total phase delay of a quarter of a wavelength in the exiting light. And two quarter-retarders could be cemented together to achieve the function of a half waveplate. Our Fresnel Rhomb Retarders are are good substitutes for broadband waveplates and UV waveplates, with extremely broad bandwidth from the Ultraviolet to the LWIR wavelength spectral. And the variation in retardance is within 2% across the wavelength range.
Hangzhou Shalom EO offers Fresnel Rhomb Retarders with either λ/2 or λ/4 retardance, for Ultraviolet, Visible and Infrared applications. The Fresnel Rhomb Retarders made from BK7 (operate at wavelength ranges of 350-2300nm), UV Fused Silica ( wavelength range 210-400nm) and ZnSe (wavelength range 2000-15000nm), both customized versions and off-the-shelf products for online shopping are available.
|Hangzhou Shalom Electro-optics Technology Co., Ltd.|
|Product Category||Optical Polarizers|
|Product Name||Fresnel Rhomb Retarders|