Shanghai Longway Special Glass Co., Ltd.
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Precision Optical Plano Concave Lenses for Beam Expansion and Light Divergence
Material & Fabrication
Substrates: Optical glass (N-BK7, SF11), Fused Silica (UV grade), CaF₂ (deep UV), ZnSe/Ge (IR)
Precision Standards: λ/4 surface accuracy, ±0.01mm thickness tolerance, <3 arcmin centration error
Coatings: Broadband/V-Lambda AR options (>99.5% transmission)
Key Optical Properties
Focal Length: Negative (typically -10mm to -1000mm)
Surface Quality: 20-10 scratch-dig specification
Wavefront Distortion: < λ/2 @ 632.8nm
Geometric Feature: Flat (plano) surface + inward-curving (concave) surface
Primary Functions
Beam Expansion: Diverges collimated input to widen laser diameter (e.g., pre-collimation in Galilean telescopes)
Light Divergence: Creates controlled spreading for uniform illumination
Focal Length Reduction: Compensates for convergence in imaging systems
Aberration Correction: Counters spherical distortion in multi-lens assemblies
Critical Applications
Laser Systems: Beam shaping in Nd:YAG/CO₂ lasers, fiber collimators, and interferometers
Imaging Optics: Field flattening for microscopes/telescopes, eyepiece correction
Sensing & LiDAR: Divergence control in rangefinders and 3D scanners
Illumination: Uniform light distribution in medical/scientific devices
Metrology: Wavefront manipulation in interferometric testing
| Item | Optical glass plano concave lens |
| Material | Optical glass, Qurartz glass, Pyrex, borosilicate glass, Float glass |
| Diameter Tolerance | +0/-0.2 mm |
| Thickness Tolerance | +/-0.2 mm |
| Processed | by grinding, polishing |
| Surface Quality | 80/50,60/40 |
| Material Quality | no scratches and air bubble |
| Transmission | above 90% |
| Chamfer | 0.1-0.3 mm x 45 degree |
| Surface Coating | Available |
| Usage | Photography, Lighting system, Electronic apparatus |
