Multi-Material Small-Scale Biconcave Lens Custom Fabrication
A biconcave lens has two inward-curving surfaces that diverge incoming parallel light rays, providing controlled beam expansion and precise beam shaping. Designed for both laser and imaging applications, this biconcave lens delivers accurate light control, reduced spherical aberration, and high transmission efficiency.
Key Features
- Accurate Beam Divergence: Biconcave design precisely diverges light while minimizing aberrations.
- High Surface Quality: Polished to 20-10 scratch-dig with < λ/4 surface flatness for consistent performance.
- Flexible Sizes & Focal Lengths: Diameters from 4–80 mm, focal lengths from -10 to -200 mm.
- Material Versatility: Almost any optical material can be processed; BK7 and Fused Silica provide the most refined results.
- Custom Integration: AR coatings, lens shapes, and sizes can be optimized for compact optical modules or miniaturized devices.
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At Hobbite, we specialize in custom optical solutions for small-scale components. While we can process a wide range of optical materials to meet your requirements, our team has deep expertise with BK7 and Fused Silica (quartz), ensuring the highest precision and reliability. This makes our double concave lens ideal for Laser Systems, Imaging Devices, Optical Communication, Medical Instruments, Illumination, and Sensing Applications.
Material Options & Customization
We offer biconcave lenses in multiple materials and can customize almost every aspect for your system:
- BK7: Reliable, cost-effective optical glass with high transparency and stability; best for visible-to-NIR applications. Perfect for standard laser collimation, imaging, and lab setups.
- Fused Silica (Quartz): Excellent UV-to-IR transmission, low thermal expansion, and high laser damage threshold; ideal for high-power lasers, fiber coupling in telecom, and thermally demanding environments.
- Other Materials: Specialty glasses, crystals, or custom materials can be fabricated on request to meet wavelength, thermal, or mechanical constraints.
Customizable features include:
- Lens diameter, thickness, and focal length tailored for compact or modular optical systems.
- Surface quality, centering, and scratch-dig are optimized for miniaturized optical components.
- Optional AR coatings for VIS, NIR, or UV wavelengths.
- Special shapes or micro-optical features for integration into laser modules, fiber optics, or sensor arrays.
Applications
- Laser Systems: Diverge laser beams from diodes or fiber outputs for uniform energy distribution in compact modules.
- Imaging Devices: Correct beam paths in microscopes, cameras, projectors, or machine vision systems.
- Optical Communication: Control divergence for fiber coupling or transceivers to enhance signal efficiency.
- Medical Instruments: Safely expand laser beams for diagnostic or therapeutic devices.
- Illumination: Shape LED or lamp light for even coverage in inspection or scientific instruments.
- Sensing Applications: Improve beam uniformity and detection range in IR/UV sensors, LIDAR, and spectrometers.
How to Choose (Simple Guide)
Choosing the right double concave lens ensures optimal performance:
- Focal Length: Short negative focal lengths (-10 to -30 mm) for compact beam divergence; long focal lengths (-50 to -200 mm) for gentle expansion.
- Diameter: Larger lenses capture more light but need precise alignment; smaller lenses suit miniaturized devices.
- Material & Customization: Any optical material can be processed, but BK7 and Fused Silica provide the most mature, reliable results.
- Coating: Choose AR coatings to match your operating wavelength for maximum transmission and minimal reflection.
By following these guidelines, your Biconcave Lens will deliver accurate beam divergence, stable optical performance, and flexible integration for small-scale optical systems. Get a Quote for a custom double concave lens tailored to your optical assembly. Contact Our Optical Engineer for integration, coating, or material selection advice.
Specifications
| Parameter | Specification |
|---|---|
| Material | BK7, Fused Silica, CaF₂, or customer-specified materials |
| Wavelength Range | 185 – 2100 nm |
| Diameter Range | 4 mm – 80 mm |
| Dimension Tolerance | +0.0 / -0.1 mm |
| Center Thickness Tolerance | ±0.05 mm |
| Sag Tolerance | +0.05 mm |
| Clear Aperture | > 85% |
| Focal Length Tolerance | ±1% (High Precision) |
| Surface Figure | λ/4 PV |
| Surface Quality | 20/10 S/D |
| Centration | < 1 arc minute |
| Coating | Custom coatings available upon request |
| Lens Type | Biconcave Lens (BK7 / Fused Silica / CaF₂ options) |
Parameter | BK7 Double Concave Lens | Fused Silica Biconcave Lens |
Diameter (mm) | 4 / 10 / 12.7 / 20 / 25.4 / 80 | 4 / 10 / 12.7 / 20 / 25.4 / 80 |
Effective Focal Length (EFL, mm) | -10 – -200 | -10 – -200 |
Refractive Index (nd) | 1.5168 @ 587.6 nm | 1.4585 @ 587.6 nm |
Transmission Range (nm) | 350 – 2000 | 185 – 2100 |
Surface Quality | 20-10 Scratch-Dig | 20-10 Scratch-Dig |
Surface Flatness (P-V) | < λ/4 @ 632.8 nm | < λ/4 @ 632.8 nm |
Centration Error | ≤3 arcmin | ≤3 arcmin |
Coating Options | Uncoated / VIS AR / NIR AR | Uncoated / UV AR / NIR AR |
Typical Transmission | ≥92% | ≥93% |
Laser Damage Threshold | 3 J/cm² @ 1064 nm | 10 J/cm² @ 1064 nm |
