AL72512-E1 25.4 mm Dia. ZnSe AR coated Aspheric Lenses; EFL=12.7 mm; NA=0.67 2-5µm
- Type
- Lens
- Subtype
- Aspheric Lens
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 25.4 mm
- EFL
- 12.7 mm
- R1
- 18.25 mm
- R2
Material
- Name
- ZnSe
- Dispersion Equation
- Sellmeier
- n (λ)
- 2.43313289576804
- λ
- 4000 nm
- B1
- 4.45813734
- C1
- 0.040344681 μm2
- B2
- 0.467216334
- C2
- 0.15317139 μm2
- B3
- 2.8956629
- C3
- 2221.822369 μm2
AL72512-E1 25.4 mm Dia. ZnSe AR coated Aspheric Lenses; EFL=12.7 mm; NA=0.67 2-5µm
The AL72512-E1 is a high-quality aspheric lens offered by Thorlabs, designed for use in the 2-5µm wavelength range. This lens boasts a 25.4 mm diameter and is made from ZnSe (Zinc Selenide) material, specifically the ZnSe connolly variant.
The lens features an effective focal length (EFL) of 12.7 mm and a numerical aperture (NA) of 0.67, making it a versatile choice for a variety of applications. The aspheric design helps to minimize spherical aberration, providing superior image quality.
The lens is coated with Thorlabs' E1 Broadband Anti-Reflective coating on both the front and back surfaces, which is designed to reduce surface reflections and increase transmission in the 2-5µm range. This coating is 8° AOI (Angle of Incidence) optimized, ensuring high performance even at varying incident angles.
The lens has a center thickness of 7 mm and an edge thickness of 2.9 mm, providing robustness and durability. The geometry of the lens is defined by several radii (R1 = 18.252 mm, R2 = 0), as well as higher-order aspheric terms (A2, A4, A6, A8, A10, A12, A14, A16) that contribute to its unique optical performance.
