General Specifications
Design Wavelengths for Visible Triplet	486.1 nm, 587.6 nm, 656.3 nm
Diameter Tolerance	+0.00/-0.10 mm
Focal Length Tolerance	±1%
Surface Quality	40-20 Scratch-Dig
Centration	≤3 arcmin
Clear Aperture	>90% of Diameter
AR Coating Range	R_avg < 0.5% (400 - 700 nm)
Damage Threshold	30 MW/cm²(532 nm, 10 ns pulse, 10 Hz, Ø0.566 mm)
Operating Temperature	-40 to 85^oC

Item #	Threading
TRx127-020-A-ML	SM05 (0.535"-40)
TRx254-040-A-ML	SM1 (1.035"-40)

Features

Ø1/2" and Ø1" Mounted Versions Available

Hastings Design for Infinite Conjugate Ratios
Steinheil Design for Finite Conjugate Ratios

AR Coated for the 400 - 700 nm Range (R_avg <0.5%)
Housing Enables Easy Integration into Thorlabs' Optomechanics

An achromatic triplet is the simplest lens that enables for correction of all primary aberrations. Thorlab's Steinheil achromatic triplets are designed to provide a finite conjugate ratio and 1:1 imaging. Our Hastings triplets provide an infinite conjugate ratio and are useful for focusing collimated beams and for magnification. These triplets are composed from a low index center element cemented between two identical high index outer elements (see Specs tab) and are designed to minimize chromatic aberrations and feature good on-axis and off-axis performance.

These triplet lenses are available pre-mounted in engraved SM05-compatible (TRS127-020-A-ML) or SM1-compatible (TRS254-040-A-ML) mounts, making it easy to incorporate them into your setup. The engraving clearly indicates the part number, coating range and focal length. Unmounted versions are also available. For information on reflectivy see the Graphs tab.

Shown below is a theoretical graph of the percent reflectivity of the -A AR coating as a function of wavelength. The average reflectivity in the 400 - 700 nm range is <0.5%. The shading indicates the region for which the AR coating is optimized.

Click to Enlarge