Tower Optical to Exhibit at SPIE Defense + Commercial Sensing 2025.
Monday, 7 April, 2025
What Is a Transmission Flat and Why Precision Matters
Monday, 5 May, 2025
By: Yoany Rodriguez PhD.
In the high-stakes environments of advanced defense systems and cutting-edge medical equipment, optical precision transforms from a technical specification into a mission-critical necessity. At Tower Optical, our decades of expertise in manufacturing specialized prism configurations—from dove prisms to microprisms, retroreflectors to Amici prisms—has established us as the trusted partner for industries where failure simply isn’t an option.
Engineering Excellence Through Uncompromising Standards
Our reputation in precision optics is built on technical specifications that represent the pinnacle of manufacturing capability:
- Surface Quality: S/D 20/10 scratch/dig standards ensure optical surfaces virtually free from defects
- Flatness: L/10 (lambda/10) guarantees exceptional wavefront accuracy and minimal distortion
- Dimensional Tolerances: Precision machining to ±0.01 mm across all critical dimensions
- Size Versatility: Comprehensive capabilities spanning from microscopic 0.5 mm components to industrial-scale 150 mm prisms
- Material Mastery: Expert fabrication across BK7, Fused Silica, CaF2, Sapphire, and MgF2 substrates
These exacting standards aren’t simply technical achievements—they represent the foundation upon which mission success is built in both defense and medical applications.
Specialized Prism Configurations: Precision in Form and Function
Dove Prisms: Image Rotation Perfection
Our dove prisms, with their characteristic trapezoidal profile, deliver precise image rotation capabilities critical in:
- Weapons targeting systems requiring image stabilization
- Medical endoscopes needing controlled viewing perspectives
- Optical coherence tomography systems for non-invasive imaging
Manufacturing dove prisms to L/10 flatness ensures that the optical path maintains perfect integrity throughout the rotation, preserving critical image data.
Microprisms: Miniaturized Precision
At the cutting edge of miniaturization, our microprisms—some as small as 0.5 mm—enable revolutionary capabilities in:
- Head-up displays for fighter pilots
- Minimally invasive surgical instruments
- Advanced fiber optic communication systems
- Brain Perfusion Studies.
Despite their diminutive size, these components maintain our full ±0.01 mm dimensional tolerances, ensuring consistent performance in the most demanding applications.
Retroreflectors: Perfect Return Paths
Our precision retroreflectors, manufactured with three perfectly orthogonal surfaces, return light precisely to its source—a capability essential for:
- Laser target designation systems
- Rangefinding equipment
- Optical alignment in satellite communication
- Surgical positioning systems
The S/D 20/10 surface quality of these components ensures maximum return efficiency with minimal signal degradation.
Amici Prisms: Color Without Compromise
The complex geometry of our Amici (roof) prisms demands the ultimate in manufacturing precision to maintain:
- Image orientation without inversion
- Color accuracy across the full visible spectrum
- Compact optical paths in space-constrained systems
These sophisticated prisms find applications in everything from military binoculars to surgical microscopes, where their performance directly impacts operational success.
Janssen Prisms: Spectroscopic Excellence
Our precision Janssen prisms enable advanced spectroscopic capabilities critical in:
- Military chemical detection systems for threat identification
- Medical diagnostic equipment requiring precise wavelength isolation
- Environmental monitoring systems with high spectral resolution requirements
Manufactured to our exacting S/D 20/10 standards and L/10 flatness, these compound prisms deliver exceptional dispersion characteristics while maintaining signal integrity—essential for applications where spectral analysis directly impacts decision-making and safety outcomes.
High Reflective Surfaces: The Foundation of Performance
Each prism configuration relies on the exceptional quality of its reflective surfaces. Our proprietary coating technologies create surfaces with:
- Reflection values exceeding 99.9% at specified wavelengths
- Durability in extreme environmental conditions
- Resistance to thermal shock and mechanical stress
- Consistent performance across ultraviolet, visible, and infrared spectra
For defense applications, these high reflective surfaces ensure that critical optical signals maintain their integrity even in the harshest battlefield conditions. In medical devices, they guarantee the precise light delivery essential for accurate diagnosis and effective treatment.
Material Selection: Engineered for Application
Different applications demand specific material properties, and our expertise spans the complete spectrum of optical substrates:
- BK7: Our standard material for visible wavelength applications, offering excellent homogeneity and transmission
- Fused Silica: Superior thermal stability and UV transmission for high-energy applications
- Calcium Fluoride (CaF2): Exceptional IR transmission for thermal imaging and spectroscopy
- Sapphire: Unmatched hardness for extreme environments where abrasion resistance is paramount
- Magnesium Fluoride (MgF2): Birefringent properties essential for polarization control
Each material presents unique manufacturing challenges—from the thermal sensitivity of CaF2 to the crystalline hardness of sapphire. Tower Optical’s specialized fabrication techniques ensure consistent quality regardless of substrate complexity.
Defense Applications: Where Optical Performance Meets National Security
In defense systems, the precision of optical components directly impacts mission success and personnel safety:
Advanced Target Acquisition Systems
The combination of our dove prisms and high reflective coatings enables targeting systems with unprecedented accuracy. The L/10 flatness ensures that laser designation remains precise at extreme ranges, providing warfighters with confidence in their systems.
Night Vision and Thermal Imaging
Our CaF2 prisms and specialized microprism arrays transform invisible infrared radiation into actionable intelligence. The S/D 20/10 surface quality ensures maximum signal transmission, extending detection ranges and improving threat identification.
Guidance and Navigation
From missile seekers to unmanned vehicles, our retroreflectors and Amici prisms provide the optical foundations for systems that must operate with absolute precision. The ±0.01 mm dimensional tolerances ensure perfect alignment within these complex systems.
Periscopic and Fire Control Systems
The implementation of our precision prisms in submarine periscopes and tank fire control systems allows for accurate targeting while maintaining crew safety. The durability of our sapphire components ensures consistent performance even under extreme mechanical stress.
Medical Applications: When Precision Saves Lives
The same manufacturing excellence that serves defense applications creates revolutionary capabilities in medical devices:
Surgical Navigation Systems
Our retroreflectors and microprisms enable precise spatial tracking during delicate procedures, ensuring that surgeons can navigate with confidence through complex anatomy.
Ophthalmic Diagnostic Equipment
Amici prisms with S/D 20/10 surface quality allow for detailed retinal examination without image distortion, enabling early detection of sight-threatening conditions.
Endoscopic Imaging
Dove prisms as small as 0.5 mm enable minimally invasive visualization with perfect image orientation, guiding surgeons through procedures with unprecedented clarity.
Laser Treatment Delivery
High reflective surfaces on our precision prisms direct therapeutic laser energy with pinpoint accuracy, enabling treatments that target disease while sparing healthy tissue.
Manufacturing Excellence: The Tower Optical Process
Creating optical components that meet these stringent standards requires a manufacturing ecosystem built on precision:
- Material Selection: Starting with optical-grade materials subjected to rigorous quality control
- CNC Precision Machining: Achieving rough dimensions with tolerances approaching ±0.01 mm
- Fine Grinding and Polishing: Developing optical surfaces that meet S/D 20/10 standards
- Metrology: Employing interferometric testing to verify L/10 flatness
- High-Reflective Coating Application: Depositing specialized coatings in controlled environments
- Assembly and Integration: Combining multiple optical elements with precise alignment
- Final Quality Assurance: Multi-point inspection verifying all specifications
Each step in this process is executed by skilled technicians using state-of-the-art equipment, ensuring that every prism configuration—whether dove, micro, retroreflector, or Amici—meets or exceeds the required specifications.
Innovation Through Collaboration
Tower Optical’s engineering team works directly with defense contractors and medical device manufacturers to develop custom prism solutions for emerging challenges. This collaborative approach has resulted in:
- Novel prism configurations for next-generation weapon systems
- Miniaturized optical trains for advanced medical diagnostics
- Specialized coating formulations for extreme environmental conditions
- Integrated optical assemblies that combine multiple prism functionalities
By partnering with our customers from concept through production, we ensure that the final optical components not only meet technical specifications but also deliver the real-world performance these critical applications demand.
Conclusion: Precision That Powers Performance
In industries where tolerances are measured in wavelengths of light and consequences are measured in lives, Tower Optical delivers precision without compromise. Our specialized prism configurations—dove prisms, microprisms, retroreflectors, Amici prisms, and Janssen prisms—manufactured to S/D 20/10 surface quality, L/10 flatness, and ±0.01 mm dimensional tolerances, represent the pinnacle of optical engineering.
From the microscopic scale of 0.5 mm components to industrial-scale 150 mm prisms, across materials from BK7 to exotic sapphire substrates, our manufacturing capabilities ensure that when precision matters most, Tower Optical delivers.
As defense and medical technologies continue their rapid evolution, the demand for increasingly sophisticated optical components grows in parallel. Tower Optical remains at the forefront of this revolution, transforming optical theory into manufactured reality—one precision prism at a time.
Interested in exploring Tower Optical’s extensive range of precision custom prisms, including micro prisms? We invite you to connect with our team by email at sales@toweroptical.com or by phone at 561-740-2525. Our knowledgeable experts are ready to assist you with your inquiries, provide detailed information about our prism capabilities, and guide you through the process of bringing your optical design to life. Don’t hesitate to reach out and discover how Tower Optical can help you achieve exceptional optical performance with our high-quality, precision-engineered prisms.
