• Diameter: Ø30 mm
• AR Coated for the 1050 - 1620 nm Range
• Wavelength-Dependent Focal Length Shift Data for Each Doublet
• Surface Quality: 40/20 Scratch/Dig

Thorlabs' cemented IR Achromatic Doublet, which is computer optimized at infinite conjugate ratios, is designed to work in the telecommunications region (1050 - 1620 nm). With design wavelengths at 1016 nm, 1330 nm, and 1550 nm, this achromatic doublet is useful for controlling chromatic aberration; it is frequently used to achieve a diffraction-limited spot when using a monochromatic source like a laser.

For best performance when collimating a point source with a positive focal length doublet, generally the first air-to-glass interface should have the greater radius of curvature (i.e., the flatter surface). Conversely, when focusing a collimated beam, the air to glass interface with the shorter radius of curvature (i.e., the more steeply curved surface) should face the incoming beam. When using a negative focal length achromatic doublet to diverge a collimated beam, the concave air-to-glass interface should face the collimated source.

• Design Wavelengths: 1016 nm, 1330 nm, and 1550 nm
• Diameter Tolerance: +0.00/-0.10 mm
• Focal Length Tolerance: ±1%
• Spherical Surface Power: 3?/2
• Spherical Surface Irregularity: ?/4
• Centration: =3 arcmin
• Clear Aperture: >90% of Diameter
• C Coating Range R_avg: <0.5% (1050 - 1620 nm)
• Damage Threshold: 5.0 J/cm² (1542 nm, 10 ns, 10 Hz, Ø0.181 mm)
• Operating Temperature -40 to +85 °C
• Diameter: 30 mm
• f: 100 mm
• f_b: 88 mm
• r₁: 33.55 mm
• r₂: -39.17 mm
• r₃: 100.69 mm
• t_c1: 8.5 mm
• t_c2: 2.2 mm
• t_e: 8.3 mm
• Materials: N-BAF10/N-SF6HT
• Recommended Lens Mounting Options: SCL03