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BVO NIR DS2
BVO NIR DS2 Linear Polarizer
Optimized Range: 525 nm – 1,065 nm | Highest Contrast NIR | Dyestuff Construction
30,629:1 NIR Contrast
525–1065 nm
Peak >45,000:1
Absorptive
Dyestuff
BVO NIR DS2 is Bolder Vision Optik's highest contrast NIR linear polarizer. The dyestuff construction is optimized for the NIR band from 525 nm to 1065 nm, delivering an average contrast ratio of 30,629:1 across the 800–1000 nm NIR band — with peak contrast exceeding 45,000:1 at select NIR wavelengths. This makes NIR DS2 the product of choice for applications requiring maximum polarization extinction in the NIR: machine vision plastics sorting, recycling inspection, ultra-contrast NIR cameras, and demanding polarimetry instrumentation.
Note on visible range: NIR DS2 is optimized for the NIR band. Tc is elevated at 400–500 nm (visible contrast ~6,000:1) as the dyestuff system is tuned for maximum NIR performance. For broadband VIS+NIR applications requiring high contrast across both bands, see
BVO NIR Ultra.
30,629:1
Avg NIR Contrast (800–1000 nm)
>45,000:1
Peak NIR Contrast
15,630:1
Avg VIS Contrast (525–700 nm)
BVO NIR DS2 Linear Polarizer — Transmission Performance
Input Light: Plane Polarized | Measured Range: 400–1100 nm | Optimized Range: 525–1065 nm | Avg NIR contrast (800–1000 nm): 30,629:1
Key Features
- Highest contrast NIR polarizer in the BVO product line — 30,629:1 average NIR (800–1000 nm)
- Peak contrast exceeding 45,000:1 at select NIR wavelengths
- Optimized range: 525 nm to 1,065 nm — NIR-tuned dyestuff system
- Average visible contrast 15,630:1 (525–700 nm)
- Absorptive, non-reflective — no back-reflection artifacts into the optical system
- Dyestuff construction — stable, monotonic NIR performance
- Ideal for plastics sorting and recycling — NIR spectral signatures require maximum contrast
- BBAR anti-reflection coated BK-7 glass components available (400–900 nm or 700–1100 nm)
- PSA conversion available for direct lamination to optical surfaces
- Custom geometry — .dxf routing or laser cutting to 10–25 micron tolerances
- Glass or acrylic (CCA) lamination available for OEM integration
Performance
NIR DS2 is engineered for maximum contrast in the NIR band. Tc drops sharply from 500 nm as the dyestuff system engages, falling below 0.01% from approximately 560 nm and reaching a minimum of 0.001% in the 850–950 nm window — the lowest dark-state transmission in the BVO NIR polarizer family.
Single-pass transmission (Tp) rises steadily from 400 nm to a broad peak of approximately 65% at 720–750 nm, then gradually increases again above 1000 nm reaching 80% at 1100 nm. The trade-off is elevated Tc at 400–500 nm — the dyestuff is optimized for NIR rather than visible extinction.
Key Wavelength Data
| Wavelength | Tp (%) | Tc (%) | Note |
|---|
| 400 nm | 11.3% | 1.746% | Below optimized range — high Tc |
| 500 nm | 53.2% | 0.301% | Tc falling rapidly |
| 550 nm | 56.7% | 0.033% | Start of optimized range |
| 600 nm | 59.5% | 0.005% | High contrast visible |
| 700 nm | 64.8% | 0.002% | Peak visible/NIR transition |
| 800 nm | 60.0% | 0.002% | NIR — excellent contrast |
| 900 nm | 54.4% | 0.001% | Minimum Tc — peak NIR contrast |
| 1000 nm | 63.5% | 0.002% | NIR — excellent contrast |
| 1065 nm | 70.3% | 0.004% | Upper optimized range limit |
| 1100 nm | 80.1% | 0.184% | Tc rising — above optimized range |
Standard Film Specifications
| Parameter | Value |
|---|
| Optimized Range | 525 nm – 1,065 nm |
| Measured Range | 400 nm – 1,100 nm |
| Contrast Ratio NIR | 30,629:1 average (800–1000 nm); peak >45,000:1 |
| Contrast Ratio VIS | 15,630:1 average (525–700 nm) |
| Film Cut Tolerances | ±50 microns standard; 10–25 microns precision |
| Adhesive (PSA) | None standard; PSA conversion available |
| Temperature Range | −20°C to 70°C |
| Color | Neutral Gray |
| Substrate | Plastic Cellulose Triacetate, dichroic dyestuff |
| Surface Quality | 80/50 Scratch-Dig |
Standard Component Specifications (BK-7 Glass)
| Parameter | Value |
|---|
| Outer Dimension | 25.4 mm OD ± 0.20 mm |
| Wavefront Distortion | λ/2 measured at 632 nm |
| Substrates | BK-7 optical glass |
| Surface Quality | 40/20 Scratch-Dig |
| Beam Deviation | 2 arc minutes |
| Anti-Reflective Coatings | 400–900 nm or 700–1100 nm BBAR |
Applications
Plastics Sorting & Recycling
NIR spectral signatures for plastics identification require maximum polarization extinction. DS2's >45,000:1 peak contrast eliminates stray light that masks material signatures.
Machine Vision NIR Imaging
Ultra-high contrast NIR polarization for defect detection, sorting lines, and industrial inspection where stray polarized light degrades image quality.
NIR Camera Polarization
Highest contrast NIR polarizer for scientific and industrial NIR cameras requiring maximum extinction ratios in the 700–1065 nm band.
Broadband NIR Polarimetry
Ultra-contrast polarimetry instrumentation measuring polarization states in the NIR. DS2 + AQWP6 waveplate provides a complete NIR polarimetry component set.
Food & Agriculture NIR Inspection
NIR polarized imaging for food quality, moisture content, bruise detection, and agricultural sorting systems operating in the 700–1000 nm NIR band.
Semiconductor NIR Inspection
High contrast NIR polarization for silicon wafer inspection and semiconductor process control in the NIR transparency window.
NIR Laser Polarization
High extinction ratio film polarizer for NIR laser systems and fiber optic applications in the 700–1065 nm band.
Raman Spectroscopy NIR
Maximum contrast NIR polarizer for polarized Raman spectroscopy in the NIR excitation band where background rejection is critical.
BVO NIR Family — Contrast Comparison
| Property |
NIR DS2 |
NIR Ultra |
NIR HD |
| NIR contrast (800–1000 nm) |
30,629:1 avg / >45,000:1 peak |
7,000:1 |
5,000:1 |
| VIS contrast (525–700 nm) |
15,630:1 |
20,000:1 |
20,000:1 |
| Optimized range |
525–1065 nm (NIR) |
400–1000 nm (full VIS+NIR) |
400–1000 nm (full VIS+NIR) |
| LED burn-in resistance |
Standard |
Standard |
Yes — dyestuff rated |
| Primary use case |
Max NIR contrast — sorting, polarimetry |
Imaging, wire grid replacement |
LED illumination, automotive |
| Max temperature |
70°C |
70°C |
95°C |
Custom & OEM Capabilities
| Capability | Detail |
|---|
| Film stock | Uncoated bulk sheet — contact BVO for maximum format |
| PSA conversion | Pressure-sensitive adhesive backing for direct lamination |
| Glass lamination | BK-7 optical glass or acrylic (CCA) — bonded and AR-coated |
| BBAR coatings | 400–900 nm or 700–1100 nm anti-reflection coatings on BK-7 |
| Custom geometry | .dxf routing or laser cutting, 10–25 micron tolerances |
| Volume OEM | Contact BVO for pricing on quantities over 100 units |
Contact Bolder Vision Optik