BVO 38 Polarizer
BVO 38 linear polarizer is the solution to outdated optical drawings calling for the old Polaroid / 3M HN 38 visible polarizer. Legacy can be important as to not repeat re-qualification in optical systems. Some applications do call for a lower transmission polarizer, BVO 38 meets the challenge.
Visible Dichroic Linear Polarizer
- Active Range: 420nm – 750nm
- 38% nominal transmission
- Type – transmissive, absorptive
- Legacy polarizer – replacement for deprecated optical drawings
- Covers 750nm LED’s
- Extended visible wavelength range
- BBAR coated BK-7 components available
- Polarizer film available with or without PSA
- Replaces 3M polarizer – HN 38
Applications
- Support Outdated Drawing Specifications
- Photography
- Glare Reduction
- Optical Signal Processing Instruments
- Sensors
Spec Downloads
Precision Polarizer – Glass Laminated Components
OEM Volume – Custom Specs Reduced Cost
Raw Polarizer – Precision Volume Cut or Custom Mounted
Film Specifications
| Polarizer Range | 420nm – 760nm |
| Contrast Ratio | 2,500:1, nominal |
| Maximum Dimension | 1000mm x 620mm |
| Thickness | .190mm |
| Film Cutting Tolerances | ± 50 microns |
| Adhesive (PSA) | Yes, non PSA option available |
| Temperature Range | -20° C to 70° C |
| Damage Threshold | 1 W/cm2, CW 0.2 J/cm2 with 20 nsec pulse, visible |
| Color | Neutral Gray |
| Substrate | Plastic Type, “Cellulose Triacetate”, dichroic |
| Surface Quality | 80/50 Scratch-Dig |
Component Specifications
| Outer Dimension | 25.4mm ± 0.20mm |
| Wavefront Distortion | Lambda/2 measured @ 632nm |
| Thickness | 4.25mm ± 0.20mm |
| Substrates | BK-7 |
| Surface Quality | 40/20 Scratch-Dig |
| Beam Deviation | 2 arc minutes |
| Anti Reflection Coatings | R ≤ 0.65% / surface, average. 400-900nm |
| Environmental Tolerance | -10˚ C to 70˚ C |
OPTIONAL LAMINATION SUBSTRATES :
Optical Grade BK-7
Low Wavefront Distortion Glass
- Industry standard optics glass
- Good transmission visible and NIR
- Best for low wavefront distortion
- Thickness flexibility
- Double side polished, lambda/10 flatness
- Refractive index – 1.52
BK-7 Glass Transmission Chart
Bk-7 Optional BBAR COATING
- R ≤ .65% per surface, avg.
- Ultra broad range, 400nm to 900nm
400-900nm BBAR on BK-7 scan – typical
Corning Display Glass
Results in thin final components
- Thin glass, excellent clarity
- No residual birefringence
- Imaging quality flatness
- No added heavy metals
- 0.5, 0.7mm, 1.1mm options for thickness
- Refractive index – 1.50
Corning Glass Transmission Chart
Corning Glass Optional HEA BBAR COATING
- R ≤ .65% per surface, avg.
- Visible range, 425nm to 685nm
Visible HEA BBAR scan – typical
Non-Birefringent Acrylic
Inexpensive Complex Shapes
- No residual birefringence substrate
- Cheapest option for laminated products
- Digitally cut for all geometric shapes
- Thin flexible substrate (bends)
- 0.2mm – 5.0mm options for thickness
- Refractive index – 1.49
Non-birefringent acrylic transmission chart
Acrylic Optional AR Coating
- R ≤ 1% per surface, avg.
- Visible range, 425nm to 700nm
Acrylic Optional AR scan – typical
