Dichroic Circular Polarizer

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Dichroic Circular Polarizer

KEY FEATURES
  • High isolation
  • Large diameters available
  • Low transmitted wavefront distortion
DESCRIPTION
Meadowlark Optics Dichroic Circular Polarizers consist of a dichroic linear polarizer and true zero-order quarterwave retarder. Precisely aligning the retarder fast axis at 45° to the linear polarization direction ensures optimum performance.
 

True zero-order retarders are used in the assembly of our Dichroic Circular Polarizers and tight retardance tolerances contribute to the final performance.

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Meadowlark Optics Dichroic Circular Polarizers consist of a dichroic linear polarizer and true zero-order quarterwave retarder. Precisely aligning the retarder fast axis at 45° to the linear polarization direction ensures optimum performance.
 
True zero-order retarders are used in the assembly of our Dichroic Circular Polarizers and tight retardance tolerances contribute to the final performance. Once aligned, both polarizer and retarder materials are laminated between optically flat substrates, providing a peak-to-valley transmitted wavefront distortion of less than  λ/5. Anti-reflection coated windows ensure surface reflection losses are minimized.
 
Achievement of the desired polarization effect requires proper orientation of your Dichroic Circular Polarizer; be sure to position the indicator marking in the direction of beam propagation. Our standard Dichroic Circular Polarizers are designed for single wavelength applications. Achromatic versions are also available on a custom basis.
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White Paper:   Finding the Optimal Polarizer

Specifications - Dichroic Circular Polarizer
Standard Wavelengths 532, 632.8, 670, 780, 850, 1064, and 1550 nm
Substrate Material N-BK7
Polarizer Material Dichroic Polymer
Retarder Material Birefringent Polymer
Transmitted Wavefront Distortion (P-V @ 632.8 nm)
Visible
Near Infrared
≤ λ/5
≤ λ/2
Beam Deviation
Visible
Near Infrared
≤ 1 arc-min
≤ 2 arc-min
Surface Quality (scratch-dig) 40-20
Reflectance (per surface) ≤ 0.5%
Isolation >99.8%
Storage Temperature -20˚C to +50˚C
Operating Temperature -20˚C to +50˚C
Laser Damage Threshold 1 W/cm2, CW
Prolonged exposure to strong ultraviolet radiation may damage these polarizers.

 

Ordering Information - Dichroic Circular Polarizer
Mounted
Clear
Aperture
in. [mm]
Thickness
in. [mm]
Diameter
± 0.005 in.
[± 0.13 mm]
Part Number
0.40
[10.2]
0.25
[6.35]
Ø1.00
[Ø25.4]
CPM-050-λ
0.70
[17.8]
0.35
[8.9]
Ø1.00
[Ø25.4]
CPM-100-λ
1.20
[30.5]
0.50
[12.7]
Ø2.00
[Ø50.8]
CPM-200-λ
Unmounted
Clear
Aperture
in. [mm]
Thickness
in. [mm]
Diameter
+0/-0.010 in.
[+0/-0.25 mm]
Part Number
0.40
[10.2]
0.13
[3.3]
Ø0.50
[Ø12.7]
CP-050-λ
0.80
[20.3]
0.26
[6.6]
Ø1.00
[Ø25.4]
CP-100-λ
Meadowlark Optics standard Dichroic Circular Polarizers provide left-hand circular output.
Please call to request a quote for right-hand output.
Append a "-RH" to your part number for right hand circular output.