For applications in wavelength regimes less than 410 nm, Thorlabs’ air-gap UV doublets provide excellent performance down to 240 nm. The achromatic doublets featured on this page are also available mounted. When choosing a lens mount, make sure the mount can accommodate the diameter and edge thickness specifications of the lens. Alternatively, you can choose an appropriate mount from our entire selection of fixed diameter lens mounts, self-centering adjustable lens mounts, and adjustable lens mounts. Recommended lens mounts are given in the text under each table below. Please see the diagram under the reference drawing link below for additional details. Doublets Ø1/2" and larger are engraved with the item # on their edge, oriented so that the text is right-side up when the flattest side of the lens is the bottom surface. In addition, the Performance tab gives examples of how the performance of achromatic doublets can be analyzed by downloading the Zemax ® files found by clicking the document icon next to the appropriate part number below.įor best performance, the side of the lens with the largest radius of curvature (flattest side) should face away from the collimated beam. To see how the performance of achromatic doublets compares to single lenses, refer to the Application tab above. Our design for the achromatic doublets uses the helium "d" line (587.6 nm, yellow) and the hydrogen "F" (486.1 nm, blue/green) and "C" (656.3 nm, red) lines since these wavelengths reasonably represent the visible spectrum and are used to define the Abbe Number, V d, of a material. Thorlabs' cemented Achromatic Doublets are optimized to provide excellent performance in the visible region. -20 to -100 mm Focal Lengths for Negative Doublets.7.5 to 1000 mm Focal Lengths for Positive Doublets.Negative Doublet Sizes from Ø1/2" to Ø2".Positive Doublet Sizes from Ø5 mm to Ø2".For an explanation of why the linear power density provides the best metric for long pulse and CW sources, please see the Damage Thresholds tab. The power density of your beam should be calculated in terms of W/cm.For applications that require higher damage thresholds, please consider our air-spaced doublets.
The damage threshold of cemented achromatic doublets is limited by the cement.This specification is also commonly referred to as surface fit. Much like surface flatness for flat optics, spherical surface power is a measure of the deviation between the surface of the curved optic and a calibrated reference gauge.