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Technical Details

SPECIFICATIONS

  • Typical Transmittance: 95-99%
  • Phase precision: As low as 0.02 mrad/µm
  • Available F-numbers: F/1.0 – F/100+
    • For IR, minimum F-number is F/0.5
  • Smallest Grating Period: <2um at edge
  • Typical Bandwidths (narrowband type): ±6% around 1550nm, 800nm, 633nm, 532nm, or 455nm; other wavelengths custom
  • Typical Bandwidths (broadband type): 450-650nm, 500-900nm, 1-4 µm; other wavelength ranges custom
  • Size: Up to 300 x 300mm sq
    • Round or arbitrary cut samples are custom
  • GPL Arrays
    • Minimum Lenslet Size: 15 µm
    • 1um transition region between lenses
  • Patterning: Any lens/array shape possible
  • Larger custom lens sizes are available with additional NRE

BENEFITS

Because of their unique phase manipulation mechanism and radically different fabrication, GP Lenses offer:

  • Effectively spherical wavefront, without aberration
  • Aspherical and cylindrical wavefronts, without aberration
  • Precision wavefront compensation of other elements
  • Ultra-low loss
  • Low F-numbers available
  • Thickness is largely independent of lens F/# and size
  • High transmission across visible or infrared wavelengths
  • Polarization dependent, with a positive or negative focal length controlled by the input polarization
  • Chromatic dispersion inverse to refractive lenses, allowing convenient compensation

Polarization Directed Flat Lenses

  • Unique Flat Lens Design
  • Polarization Dependent Focal Length
  • Excellent Transmission from 450 – 650nm

Polarization Directed Flat Lenses are flat lenses formed with polymerized liquid crystal thin-films that create a focal length that is dependent on polarization state. These unique lenses will have either a positive or negative focal length depending on the phase of the input polarization. With right handed circularly polarized light, the lenses will produce one focal length, while left handed circularly polarized light will present a focal length with the opposite sign. Unpolarized light will produce a positive and negative focal length at the same time. Both output waves are circularly polarized and orthogonal to each other. These Polarization Directed Flat Lenses are approximately 0.45mm thick, effectively simulating an ideal thin lens and are free from spherical aberration.

Additional Information

GP Lenses can be used in combination with refractive lenses, for ultra compact systems, and/or for chromatic aberration correction. Complex phase profiles can be made, much more easily than traditional diamond turning. Microlens arrays may be square, rectangular, or hexagonal, and lenslets may have radically different focal lengths. While transmission GP Lenses are most common, they can instead be made on mirrored substrates achieving reflective –mode.

Principle:

  • Structure is nonlinear orientation angle
  • Phase = 
  • Phase can be aspheric, aberration corrected, or any function
  • Polarization selects ± focal length
  • Broadband
  • Real transmittance into Obj + Conj beams ~99% !
  • If RHC input, all is focusing 99.4%
  • If LHC input, all is diverging 99.2%
  • If other, both waves are present

Additional Applications for Geometric Phase Lens

FAQs about Geometric Phase Lens

Q. Can you reduce the weight of my large optical elements?
A. Yes. Our optics are thin films that have very little weight. Even large size films are a fraction of the weight and thickness of traditional optical elements.

Q. Can you simplify my complicated lens system?
A. Yes. By using a combination of GPLs and CC-GPLs and potentially some standard lenses, you can correct aberrations, get rid of expensive optical materials and make the lens system shorter in length.

Q. Can you make a thin-film with a difficult phase profile without expensive and limited diamond turning fabrication?
A. Yes. This would just be a custom GPL solution.

Q. Can you combine multiple lenses and optics in a single element?
A. Yes. Because our films are flat, we can fabricate and laminate them together in a single monolithic component.

Q. Can you correct for optical aberrations in a set of lenses?
A. Yes. Our GPLs can be customized to add aberrations for correction.

White Papers about Geometric Phase Lens


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Some Questions to Consider

These are typical questions we like to ask when engaging you as a customer to help best assess and understand your needs and challenges.

  • What are the key issues with your current solution?
  • Describe the major optical challenges you are facing. Is it low efficiency? Is there a unique polarization? a difficult phase profile to work with? or something else?
  • Are there specific technology features (i.e., diffraction, polarization, retardation, wavefront, focus, opto-electronics, other) that you are interested in?
  • What are the characteristics of the light source you need to work with (i.e., polarization, bandwidth, collimation, intensity, coherence)?
  • What are the desired characteristics of the light at the output of the system?
  • Are there any specific tests, experiments, or prototypes that would best validate a solution for your problem?
  • What is the timeframe within which you need a demonstrated solution?
  • Are there any unique or challenging form factor requirements? Thickness requirements? Large active area requirements?