Optical Assemblies
For decades, RMI has invested heavily in the development of a complete in-house optical assembly program that is backed by expert engineering support, leading-edge technology, and unmatched experience.
Lens objectives, prism assemblies, optical transmitter/receiver assemblies, and advanced optical fixtures are some of RMI’s specialty custom assemblies. We pride ourselves on our dedication to the fastest service and delivery.
Our complete opto-mech program incorporates design services using state-of-the-art software, full-scale manufacturing capabilities including our in-house machine shop, and advanced testing and metrology program.
Custom Optical Assemblies Products
- Laser Optics Assemblies
- Prism Assemblies
- Lens Assemblies & Lens Objectives
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- Optical Transmitter/Receiver Assemblies
- F-Theta Lenses
- Beam Expanders
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Design & Engineering
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All RMI opto-mechanical designs are created using Zemax and SolidWorks software. With expertise in optical construction, mechanical housing, complex, multi-element assemblies, and utilizing state-of-the art custom test set-ups, our dedicated optical engineers specialize in the following product categories:
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Lens Objectives
| Wavefront Irregularity Tolerance |
| Commercial |
Standard |
High Precision |
| 3 Wave |
1 Wave |
1 Fringe |
Prism Assemblies
| Wedge Tolerance |
| Commercial |
Standard |
High Precision |
| <3 arcmin |
<1 arcmin |
<20 arcsec |
Optical Transmitter / Receiver Assemblies
| Source Types |
Sensor Types |
| Fiber Laser |
Germanium |
| LED |
Silicon |
| Incandescent |
GaAs |
| Diode Laser |
CCD Camera |
Advanced Optical Fixtures
| Designs for advanced optical fixtures may implement full translational and rotational adjustbility for zoom lenses, tip/tilt mounts, etc. RMI's optical engineers make careful considerations for performance and application of the assembly, and have extensive experience with various surface finishes including nickel plating and anodizing. |
Manufacturing
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Our complete in-house optical assembly process includes full document control as well as a focus on the most timely service and delivery. Our opto-mech manufacturing capabilities include:
Bonding Methods
| UV-Curable |
Epoxy-Heat Cured |
Mix / Dry |
| Norland 61 |
Mil-Bond Adhesive |
B/C Grey |
| Loctite 3311 |
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3M RTV Silcone |
Blocking / Tooling Methods
RMI has developed a unique solution to combine prisms for enhanced transmission that preserves tight tolerances throughout the entire assembly process.
Alignment Tolerance:
Bonding Method |
Alignment Tolerance:
Blocking Method |
| <30 arcsec |
<30 arcsec |
In-House Machine Shop
• Faster Tooling & Prototyping
• Supports Custom Test Beds
• Experience with Wide Range of Metals & Plastics |
Clean Room Assembly
• Class 1000 / 100 Clean Room Capability
• Mobile Clean Room Setup with Advanced Tests |
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Metrology & Optical Alignment
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RMI's complete in-house testing and metrology program incorporates the most advanced technologies with expert opto-mechanical engineering support. Our wide range of testing capabilities include:
Beam Deviation Testing
• Assures accurate photon delivery based on mechanical constraints.
• Unique processes available for various assembly types |
| Deviation Test Type |
Measurement Range |
| Floating Pass Through |
30 sec – 5 min |
| Custom Die Mounts Pass Through |
10 sec – 1 min |
| Mechanical Flange Perpendicularity |
30 sec – 5min |
| Angle-Block Calibration Auto-Collimation |
0.5 sec – 2 min |
Beam Location Testing
• Allows for quick and accurate alignment of mechanical and optical axis
• Using high resolution Basler camera, we can locate beam position in “x” and “y” plane to micron-level precision |
| Beam CG (Center of Gravity) / Location Tolerance |
| Commercial |
Standard |
Precision |
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| 0.5mm |
0.25 mm |
20 micron |
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Centration Testing
• Verifies optical alignment of lens vertices
• Developed unique procedure to align air gapped optical assemblies using overlaying interferograms |
Zygo / Transmitted Wavefront Testing
| • Verifies several optical properties of OM assemblies:
— Flange Focal Length
— Transmitted Wavefront Irregularity
— Advanced Prism alignment
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Mach Zender Interferometry
• Used as alignment tool for complex multi-element assemblies
• Compatible with wide range of 11 in-house laser sources |
Beam Quality / Collimation Testing
| Test Type |
Used For |
Collimation Tolerance |
| Sheer Plate |
Small Aperture |
<1 arcmin |
| Beam Dimensioning |
Large Aperture |
<15 arcsec |
Power Distribution Testing
• Gives a rough estimate of the aberrations present in the output
wave front of the system
• PSF (Point Spread Function) based test
qualifies wave front coherence |
MTF / Image Quality Testing
• Modular transfer function to quantify image quality (contrast)
• Modified testing setup using optical rail and custom mount blocks to streamline testing |
| MTF Setup Parameters |
Specification |
| Magnification Range |
2 – 200x |
| Line Pairing (7th Group-Smallest) |
100/mm2 |
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