Fresnel Rhombs

  • 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.

Delivery

Estimated delivery time: from 4 - 5 days

Holder diameter D
Holder length L
Clear aperture
Wavelength range
Material
Retardation

Mounted Fresnel Rhombs

Code Holder length L Retardation Holder diameter D Wavelength range Clear aperture Material Price Delivery Add to cart
480-0210 55 mm λ /2 73 mm 600-900 nm 10 mm BK7 725 $ Request To cart
480-0410 25 mm λ /4 65 mm 600-900 nm 10 mm BK7 370 $ Request To cart
480-0212 55 mm λ /2 73 mm 400-700 nm 10 mm BK7 725 $ Request To cart
480-0414 25 mm λ /4 65 mm 400-700 nm 10 mm BK7 370 $ Request To cart
480-1210 55 mm λ /2 73 mm 210-400 nm 10 mm UVFS 860 $ Request To cart
480-1410 25 mm λ /4 65 mm 210-400 nm 10 mm UVFS 491 $ Request To cart

Unmounted Fresnel Rhoms

Code Holder length L Retardation Holder diameter D Wavelength range Clear aperture Material Price Delivery Add to cart
481-0210 - λ /2 - 600-900 nm 10 mm BK7 405 $ Request To cart
481-0410 - λ /4 - 600-900 nm 10 mm BK7 205 $ 4 - 5 days To cart
481-0212 - λ /2 - 400-700 nm 10 mm BK7 405 $ 4 - 5 days To cart
481-0414 - λ /4 - 400-700 nm 10 mm BK7 205 $ 4 - 5 days To cart
481-1210 - λ /2 - 210-400 nm 10 mm UVFS 540 $ 4 - 5 days To cart
481-1410 - λ /4 - 210-400 nm 10 mm UVFS 326 $ 4 - 5 days To cart

Fresnel rhombs with other dimensions and parameters or coatings are available upon request. Please send request for custom products.

Delicious

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

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