CAPABILITIES
OPTICAL MANUFACTURING AND ASSEMBLY CAPABILITIES
At PFG we have extensive equipment that allows us to produce a variety of high precision optics our customers need. Our technicians use mills, grinders, spindle polishers, double sided polishers; CNC mills, polishers and edgers; MRF polishing, automated cleaning equipment, e-beam and IAD coaters, spectrophotometers and interferometers. While continually expanding and tightening the tolerances on our tooling, our engineers also focus on upgrading equipment and developing improvements to our existing processes. We attract, train and develop a workforce that strives to expand our capability and operate our equipment with increased proficiency.
SPHERICAL
PFG delivers high precision lenses for a wide range of defense, medical, semiconductor and metrology applications. We specialize in high quality lenses featuring high index glasses, high included angles, tight centering and truncation.
SPHERICAL TOLERANCE LIMITES
Specification | Limit |
Diameter (mm) | ±0.005 |
Center Thickness (mm) | ± 0.020 |
Sag – Concave (mm) | ± 0.010 |
Clear Aperture | 100% |
Radius (mm) | ± 0.0025 |
Irregularity (ƛ) | 1/20 |
Wedge Lens – ETD (mm) | 0.003 |
Bevels – Face Width @ 45° (mm) | ± 0.05 |
Scratch – Dig | 10 – 5 |
Surface Roughness (Å, RMS) | 3 |
FLAT
We fabricate precision plano optics in a multitude of shapes, sizes and specifications. We are knowledgeable and have lengthy experience with a wide variety of materials including optical glasses (100+), fused silica, optical crystals and optical ceramics.
FLAT TOLERANCE LIMITS
Specification | Limit |
Dimensions (mm) | ± 0.125 to within ± 0.005 |
Surface Quality | 10-5 |
Angles / Beam Deviation | to within ± 1 arc second |
Irregularity (λ) | 1/20 |
Surface Flatness (λ) | 1/20 |
Transmitted Wavefront (λ) | 1/20 |
Sharp Roof Chips (mm) | 0.005 |
Surface Roughness (Å, RMS) | 2 |
COATING
With electron beam and automated ion-assisted coating process technologies, PFG is able to offer an extensive range of coatings – anti-reflective, broad-band AR, short and long wavepass filters, beamsplitters, polarizers and high reflectors, both dielectric and enhanced metallic coatings.
COATING
We use FilmStar design and characterization software to create customized coatings. Multiple optimization techniques ensure the coatings meet/exceed specifications. Custom programs allow us to analyze coating sensitivity, production yields, total coating thickness, the time required to produce the coating and to estimate the change in surface figure post-coat.
We clean and inspect our optics in a class 1000 clean room and under laminar airflow hoods with particle counts typically less that 10 (of ½ micron or larger) and use other techniques to produce absolute pristine surfaces. We understand the criticality of surface roughness, surface cosmetics, cleaning methods and materials, ambient conditions as well as process technology and execution to satisfy the spectral, mechanical, laser damage and environmental requirements of customer coatings.
For spectral measurements from UV to NIR, we use Lambda 9, Lambda 900, and Lambda 1050 Perkin Elmer spectrophotometers. For IR spectral measurements, we use a Perkin Elmer 983.
We have in house capabilities to test our coatings for:
- Abrasion
- Adhesion
- Humidity
- Salt Spray
- Temperature
ASSEMBLY
From the cementing of achromats to the alignment and mounting of optics in metal housings, we have the experience, process equipment and metrology to complete your sub-assembly.
ASSEMBLIES
- Eyepieces
- High-Resolution Objectives for Projection
- High-Performance Scan Lens Assemblies
- Illumination Systems
- Laser Focusing Lens Assemblies for Excimer and YAG Lasers
- Laser Beam Expanders
- Sub-Assemblies for Lithography Inspection
- F-theta Scan Lens Assemblies
- Machine Vision Lens Assemblies
- Multi-Element Custom Lenses
- Night Vision Systems
- Optical Rangefinders
- Telecentric Objectives and Assemblies
- Prism Assemblies
- IR Objectives
METROLOGY
We believe that metrology equipment is equally as important as fabrication and coating equipment. Metrology is critical not only because it validates the finished specifications but it also aids in our fabrication and coating process.
METROLOGY EQUIPMENT
- Zygo interferometers
- Autocollimators
- Large inventory of test plates
- Many reference spheres
- PE spectrophotometers