The double-concave (DCX) lens is a negative-focal-length optical element featuring two concave spherical surfaces. Compared to plano-concave lenses, DCX lenses deliver enhanced beam divergence and superior symmetry in aberration behavior—enabling consistent, uniform beam spreading over broader angular ranges. They are widely employed to increase beam diameter, reduce power density, or serve as “negative lens elements” within complex optical systems to counteract spherical and coma aberrations.
Manufactured from high-grade optical glasses—including N-BK7 and SF-series flint glasses—our DCX lenses undergo precision fabrication to ensure exceptional surface quality and wavefront fidelity. Available in a broad range of specifications covering ultraviolet through infrared wavelengths, they are indispensable components in laser beam expansion, imaging correction, and advanced beam shaping systems.
| Parameter | Standard Specification | High-Precision Specification | Customizable Range |
| Diameter Range | 5-150mm | 3-200mm | 1-300mm |
| Focal Length Range | -10mm 至 -1000mm | -5mm 至 -2000mm | Fully customizable |
| Diameter Tolerance | +0.0/-0.1mm | ±0.02mm | ±0.01mm |
| Center Thickness Tolerance | ±0.1mm | ±0.05mm | ±0.02mm |
| Radius of Curvature Tolerance | ±0.5% | ±0.2% | ±0.1% |
| Surface Accuracy | λ/4 @ 632.8nm | λ/10 | λ/20 |
| Wavefront Accuracy | 1 fringe | 0.5 fringe | 0.2 fringe |
| Decenter | <3 arc minutes | <1 arc minute | <30 arc seconds |
| Surface Quality | 40-20 scratch-dig | 20-10 | 10-5 |
| Edge Treatment | Protective Chamfer | Precision Chamfer | Custom Chamfer |
| Clear Aperture | >90% of diameter | >95% | >98% |
