• Ø8 mm Mounted Positive Visible Achromatic Doublets
• AR Coated for the 600-1050 nm Range
• Engraved Threaded Housing Includes Part Number, Focal Length, and Coating
• Housing Enables Easy Integration into Thorlabs' Optomechanics
• Focal Length: 20 mm
• Surface Quality: 40-20 Scratch-Dig

This popular Thorlabs' cemented near IR achromatic doublet is now available pre-mounted in Ø8 mm, engraved, threaded mounts, making it easy to incorporate this optic into your setup.

The engraving on the mounts clearly indicates the part number, focal length, antireflection coating deposited onto the surface, an arrow indicating the direction of light propagation to collimate a point source, and an infinity symbol denoting that this lens has an infinite conjugate ratio.

The design wavelengths are 706.5 nm, 855.0 nm, and 1015 nm. Achromatic doublets are useful for controlling chromatic aberration and are frequently used to achieve a diffraction-limited spot when using a monochromatic source like a laser.

• Design Wavelengths for Near IR Doublets: 706.5 nm, 855 nm, and 1015 nm
• Diameter Tolerance: +0.00/-0.10 mm
• Focal Length Tolerance: ±1%
• Surface Quality: 40-20 Scratch-Dig
• Spherical Surface Power 3?/2
• Spherical Surface Irregularity: ?/4
• Centration: =3 arcmin
• Clear Aperture: >90% of Diameter
• B Coating Range: R_avg <0.5% (650-1050 nm)
• Damage Threshold: 5 J/cm²(810 nm, 10 ns pulse, 10 Hz, 0.155 mm)
• Operating Temperature: -40 to +85 °C
• Lens Diameter: 8 mm
• f: 20 mm
• f_b: 18.2 mm
• r₁: 13.53 mm
• r₂: -10.59 mm
• r₃: -47.75 mm
• t_c1: 2.3 mm
• t_c2: 1.3 mm
• t_e: 2.8 mm
• Materials: N-LAK22/N-SF6HT
• Mounting Thread: M12 x 0.5