Optical Assembly

Optical Assembly

REO designs and manufactures custom integrated optical assemblies incorporating mechanical, electronic, and optoelectronic components.  We utilize precision alignment and metrology techniques to create assemblies that exceed your most demanding requirements.  So whether you need simple mounted optics, custom lens cells or complete instrumentation benches, REO can deliver a total solution built to your print or designed to your concept.  Here is a listing of some of REO's optical assembly technologies

Activated Covalent Bonding

Activated Covalent Bonding (ACB) technology, REO’s proprietary adhesive-free method of bonding optical components, can be used to produce a wide array of monolithic visible and IR optical assemblies, such as cube beamsplitters, x-cubes, and beam combiners and separators.  ACB delivers bond strength matching that of the bulk material, but unlike traditional gluing, introduces essentially no wavefront distortion, minimizes scatter and absorption.  Adhesive materials are also typically the weakest link in a beam delivery system in terms of laser damage, so the ACB approach substantially improves component laser damage resistance and operational lifetime. The REO covalent bond even stronger than optical contacting (molecular bonding).

ACB bonds are also able to withstand long term exposure to elevated humidity conditions, and to temperatures exceeding 300°C. ACB is most effective when bonding materials that have similar coefficients of thermal expansion. While the process can be utilized for materials with mismatched CTE’s, the bond strength may be compromised and care must be taken to avoid large excursions in temperature which can create significant stress at the interface.

An additional benefit of ACB is that it may be utilized for applications at wavelengths where adhesives are not transmissive. Most commonly used UV curing optical adhesives have excellent transmission throughout the visible and near-infrared spectral range, but show significant absorption in the UV (below 370 nm) and in the mid-infrared (above 2 µm).  ACB is far superior because it doesn’t contribute additional absorption to the system, meaning it can essentially be employed from wavelengths from the deep UV through the far IR.  

Applications of ACB: Beamsplitter cubes, prims assemblies, beam combining optics, etalons, laser rods Fused silica, silicon, sapphire, fused quartz, YAG, BK7, other CTE matched materials.

Precision Active Alignment

REO utilizes state-of-the-art equipment and processes to produce multi-element lenses, prism assemblies, mounted beamsplitters, and a variety of other bonded optomechanics. Using both autocollimator and laser-based approaches to lens centration, REO can achieve better than 1um accuracy. When aligning elements with critical angle elements, REO has a selection of autocollimator, laser, and camera-based solutions which can provide accuracy to 1 arcsecond. REO uses multiple active alignment techniques depending upon the specifics of the components that need to be aligned.  

Adhesive Bonding

REO utilizes a range of adhesive technologies for bonding optical components and optomechanics. UV curing adhesives often provide the most straightforward solution with a nearly instantaneous tack-and-cure process that is desirable for active alignment. However, REO possesses deep expertise in many other adhesive types, including thermal curing, multiple-component chemical curing, and silicone based RTV’s, each of which provide advantages for specific applications. REO takes care to understand potential issues with outgassing, material compatibility, surface preparation, wavefront distortion, and other factors that can affect the long-term performance of adhesive-bonded assemblies.

REO also utilizes automated dispensing of adhesives to ensure highly accurate and repeatable adhesive volumes. These systems can dispense a variety of adhesive types and can be configured to process high volumes of optomechanical assemblies in an extremely efficient and cost-effective manner.

Custom Active Alignment

Our Engineers are experts in developing custom tooling, software and metrology to optimize the alignment and verification of your assemblies.  REO utilizes state-of-the-art equipment and processes to produce multi-element lenses, prism assemblies, mounted

 beamsplitters, and a variety of other bonded optomechanics. Using both autocollimator and laser-based approaches to lens centration, REO can achieve better than 1um accuracy. When aligning elements with critical angle elements, REO has a selection of autocollimator, laser, and camera-based solutions which can provide accuracy to 1 arcsecond.

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Contact REO to have us start thinking about you. 303.938.1960