Air-spaced achromatic laser triplet for high power Nd:YAG/2nd harmonic use; 532 & 1064 nm. These achromatic triplets are designed with the same focal length at 1064 nm and 532 nm for focusing of high power Nd:YAG and its second harmonic beam to the same point. They are corrected for spherical aberration at both wavelengths, and for coma at 1064 nm, with double V-coat AR coatings to minimize loss.

1064/532 nm air-spaced laser achromats have been achromatized for 1064 nm and 532 nm, allowing them to focus Nd:YAG and doubled Nd:YAG beams to the same point.   These lenses are corrected for spherical aberration at both wavelengths, and for coma at 1064 nm.  Double V-coat antireflection coatings minimize reflection losses, as uncoated reflections can be as much as 4% per surface on N-BK7 elements and 8% per surface on N-SF11 elements.   This combination of air-spaced construction, high quality AR coatings and good surface quality results in high laser damage threshold.  Offered in both positive (YAP) and negative (YAN) focal lengths, these lenses are used in dual wavelength beam steering applications, and in creating beam expanders to concurrently expand Nd:YAG and doubled Nd:YAG.  
• Transmitted wavefront distortion is < λ/2 over 95% of clear aperture at 633 nm
• Dual antireflection V-coatings at 1064 nm and 532 nm