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Fresnel Rhombs

Fresnel Rhombs

Due to unequal phase shifts arising in orthogonally polarized components of an incident wave at total internal reflection Fresnel Rhombs are used to alter polarisation type of radiation.

from 205 $
delivery Estimated delivery time: 4 - 5 days
Products
Specifications
Brochures
Description
Holder diameter D
Holder length L
Clear aperture
Wavelength range
Material
Retardation
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Mounted Fresnel Rhombs
Code Retardation Holder diameter D Wavelength range Clear aperture Material Holder length L Price Delivery Add to cart
480-0210 λ /2 73 mm 600-900 nm 10 mm BK7 55 mm 725 $ Request
480-0410 λ /4 65 mm 600-900 nm 10 mm BK7 25 mm 370 $ Request
480-0212 λ /2 73 mm 400-700 nm 10 mm BK7 55 mm 725 $ Request
480-0414 λ /4 65 mm 400-700 nm 10 mm BK7 25 mm 370 $ Request
480-1210 λ /2 73 mm 210-400 nm 10 mm UVFS 55 mm 860 $ Request
480-1410 λ /4 65 mm 210-400 nm 10 mm UVFS 25 mm 491 $ Request
Unmounted Fresnel Rhoms
Code Retardation Holder diameter D Wavelength range Clear aperture Material Holder length L Price Delivery Add to cart
481-0210 λ /2 - 600-900 nm 10 mm BK7 - 405 $ Request
481-0410 λ /4 - 600-900 nm 10 mm BK7 - 205 $ 4 - 5 days
481-0212 λ /2 - 400-700 nm 10 mm BK7 - 405 $ 4 - 5 days
481-0414 λ /4 - 400-700 nm 10 mm BK7 - 205 $ 4 - 5 days
481-1210 λ /2 - 210-400 nm 10 mm UVFS - 540 $ Request
481-1410 λ /4 - 210-400 nm 10 mm UVFS - 326 $ 4 - 5 days
Fresnel rhombs with other dimensions and parameters or coatings are available upon request. Please send request for custom products.

Material

BK7, UVFS

Operating spectral range BK7:

400-2000 nm

Operating spectral range UVFS:

210-400 nm

Surface quality

20-10 scratch & dig (MIL-PRF-13830B)

Surface flatness

λ/10 @ 633 nm (all polished surfaces)

Retardation tolerance

±2°

Broad band AR coating

R < 1%

Laser damage threshold > 0.5 J/cm2, 10 nsec pulse, 1064 typical

EKSMA Optics Fresnel Rhombs
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  • Rotate polarization, operates over a wide wavelength range
  • λ/2 rhomb is two optically contacted λ/4 rhombs

Due to unequal phase shifts arising in orthogonally polarized components of an incident wave at total internal reflection Fresnel Rhombs are used to alter polarisation type of radiation. They are designed so that two full internal reflections inside a rhomb provide π/2 phase difference between the orthogonally polarized components of radiation. Hence, if there is 45° angle between the polarization of the linearly polarized incident plane, the emerging beam is circularly polarized, i. e. the rhomb effect is similar to that of a quarter-waveplate. Therefore two identical Fresnel rhombs, installed in series, will provide π/2 phase difference similar to that of a half-waveplate, i. e. the device can rotate the beam polarization plane by 90°, leaving the beam direction invariable.