optical Waveplate

Description
United Photonics Technology
Waveplates
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Principle / Application – λ/4 Waveplate
UPT quarter waveplates create a quarter-wavelength phase shift (π/2, 90®) and can convert linear polarization to circular polarization and vice versa. They are often used with a linear polarizer to form an isolator, blocking light reflected back from other surfaces (ellipsometry, optical pumping, isolation).



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Principle / Application – λ/2 Waveplate
UPT half waveplates retard one polarization direction by half a wavelength (π, 180®), effectively changing the direction of linear polarization, depending on the orientation of incident linear polarization with respect to the crystal axis. Therefor they can be used as continuously adjustable polarization rotators e.g. in electro optical modulation or as a variable beam splitter when used in combination with a polarizing beam splitter.

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Achromatic Waveplate
Unlike standard waveplates, Achromatic Waveplates, provide a constant phase shift independent of the wavelength of light that is used.This wavelength independence is achieved by using two different cr..



Achromatic Waveplate


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Unlike standard waveplates, Achromatic Waveplates, provide a constant phase shift independent of the wavelength of light that is used.This wavelength independence is achieved by using two different crystalline materials to yield quarter- or half-wave retardation over a broad spectral range.The Retardation tolerance of our AWPs is better than λ/100 over the entire wavelength range.The flat response of an AWP is ideal for use with tunable lasers,multiple laser-line systems and other broad spectrum sources.

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Capability
MATERIAL
Crystal Quartz&MgF2 Crystal
DIMENSION TOLERANCE
+0/ -0.2mm
WAVEFRONT DISTORTION
λ/4
RETARDATION TOLERANCE
<λ/100
WAVELENGTH RANGE
240~2100nm
PARALLELISM
3 arc seconds
SURFACE QUALITY
40-20 scratch and dig
CLEAR APERTURE
90%
AR/AR COATING
Rave<0.8% 450~680nm,
Rave<0.8% 700~1000nm,
Rave<0.5% 950~1300nm,
Rave<0.5% 1200~1650nm
STANDARD WAVE
quarter-wave (λ /4), half-wave (λ/2)

Specifications:
λ/4
Waveplates P/N #
λ/2
Waveplates P/N #
Mounter Dia(mm)
Clear Aperture (mm)
Mounter Thickness(mm)
AWP410
AWP210
25.4
10
8
AWP412
AWP212
25.4
12.7
8
AWP415
AWP215
25.4
15
8
AWP420
AWP220
30
20
8
AWP425
AWP225
30
23.5
8
Achromatic Waveplate Curves

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Note:
• Custom designs for other sizes and coatings are also available upon request.
• UPT’s standard coatings are available.
• Other waveplates with different wavelength range are also available upon request, please contact UPT for more information.