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Refractive Microoptics Products

Refractive Microoptics

Refractive optical elements are a vital part of today's optical systems. By applying our gray scale production process we can design and fabricate anamorphic, aspherical, spherical, positive (convex), negative (concave), and off axis lenses. Gray scale provides nearly unlimited topography capabilities. Lenses range in size from 15 microns diameter to 2 mm or greater. JENOPTIK Microoptics can design microlenses using a wide variety of materials. We can make very fast, high NA, nearly hemispherical lenses. Stand-alone microlenses can be used for coupling light into a fiber or collimating a beam of light emitted by a diode. We can also design and fabricate an array of microlenses with absolute alignment accuracies.

Microlenses

Microlens Arrays

Microlens arrays are solutions for applications where there is a need for accurate alignment, size, and packaging cost reduction. JENOPTIK Microoptics can design and manufacture microlens arrays using gray scale technology, attaining higher uniformity and fill factors not possible with reflow or binary optics thinning. The shape of these microlens arrays can be square, hexagonal, circular, or cylindrical and can be square or hex-packed. Spherical, aspherical, off-center or truncated lenses can be made on one side with absolute alignment accuracies which allow each lens to be within 0.25 microns of its ideal location. Our front to back surface alignment capabilities allow lenses on both sides of a substrate to be aligned to within 1 micron. The lens shape must be tightly controlled to prevent wavefront aberration and achieve diffraction limited performance.

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Microlens Arrays for Shack Hartmann Sensors

A Shack Hartmann sensor measures the intensity profile and the wavefront of coherent light in real time and with high accuracy. The sensor divides an incident wavefront into a number of beamlets by the subapertures of a microlens array. Each microlens provides a separate focus on the sub grid of detectors on a CCD camera. The analysis of the resulting pattern is used to measure the optical phase of an incident wavefront. Applications include measurements on astronomical instruments, adaptive optics, wavefront compensation, and the eye itself. JENOPTIK provides unique microlens array solutions with high spatial resolution for Shack Hartmann sensors. These microlens arrays can be designed for wavefronts with large or small phase depths.

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Microlens Arrays for Fiber Collimators

Microlens arrays can be used both for collimating a light beam emitted by a fiber or coupling light into a fiber. The numerical aperture of the collimator is optimized for maximum coupling efficiency and the lens shape can be chosen to maximize performance within the system. JENOPTIK designs and manufactures custom microlens arrays for fiber collimators to customer specifications. The proprietary process allows active precision alignment of our microlens arrays to fiber pigtails, providing excellent beam positioning and pointing accuracy.

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Microlens Arrays for Fill Factor Enhancement

Microlens arrays are used to increase focal plane array optical fill factor by up to three times. These tiny lens systems serve to focus and concentrate the light onto the photodiode surface instead of allowing it to fall on non-photosensitive areas of the pixel device. Using a microlens array will enhance the sensitivity and dynamic range of the photodiode. JENOPTIK designs custom microlens arrays to increase the fill factor yielding improved performance of the focal plane array.

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Refractive Homogenizers

Refractive Homogenizers utilize microlens arrays to overlap a beam at the image plane even if the field angle or angular spread of the incident light is large. All outputs are integrated together making it highly uniform. Homogenizers are especially useful for laser applications that require a laser beam to maintain a controlled shape and uniform power across a specific area at some distance from the source. The strongest advantage compared to diffractive elements is that they can be used over a large waveband.

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