Unmounted Visible Achromatic Triplets
|Design Wavelengths||486.1 nm, 587.6 nm, and 656.3 nm (Finite Conj. Ratio)|
633 nm (Infinite Conj. Ratio)
|Clear Aperture||90% of Diameter|
|Diameter Tolerance||+0.00/-0.10 mm|
|Focal Length Tolerance ||±1%|
|Ravg (400 - 700 nm)||<0.5%|
|Surface Quality||40-20 Scratch-Dig|
|Centration ||<3 arcmin|
|Damage Threshold||30 MW/cm2|
(532 nm, 10 ns pulse, 10 Hz, Ø0.566 mm)
|Operating Temperature ||-40 to 85 oC|
- Ø1/4", Ø1/2", or Ø1" Unmounted Achromatic Triplets
- Steinhel Design for Finite Conjugate Ratios
- Hastings Design for Infinite Conjugate Ratios
- AR Coated for the 400 - 700 nm Range (Ravg < 0.5%)
- Excellent Aberration Compensation
An achromatic triplet is the simplest lens that corrects all primary chromatic aberrations. Thorlabs' Steinhel achromatic triplets are designed to provide a finite conjugate ratio and 1:1 imaging. In contrast, our Hastings triplets provide an infinite conjugate ratio and are useful for focusing collimated beams and for magnification. These triplets consist of a low index center element cemented between two identical high index outer elements (see Specs tab) and feature good on-axis and off-axis performance. Mounted versions are also available.
The shaded area in the reflectivity plot to the right indicates the region over which the antireflection coating is optimized.
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.
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