Fast Axis Reducer lens

The FAR lens collimates fast-axis divergence of a single mode laser diode with an acylindric convex surface and then adjusts the beam divergence with an concave cylindrical surface. The thickness of the lens is used to correct the astigmatism of the diode.

More details

The emission facet of the single mode laser diode is typically 1um thick and 3-5um wide. Its output beam is highly divergent in “fast axis direction” perpendicular to the active layer and significantly less divergent in “slow axis direction” parallel with the active layer. To collimate such an asymmetrically divergent beam, one can use combination of fast and slow axis collimating lenses (FAC+SAC). However the cross section of the beam is rectangular with longer side along the slow axis. If one wants to get collimated and round beam, he needs Fast Axis divergence Reducer lens or FAR cylindrical lens and rotationally symmetric lens with longer focal length. The FAR lens collimates fast-axis divergence of a single mode laser diode with an acylindric convex surface and then adjusts the beam divergence with an concave cylindrical surface. The thickness of the lens is used to
correct the astigmatism of the diode.

Length+/- 0.05 mm
MaterialS-TIH53
Height0.50 +/- 0.02 mm
Central Thickness0.55 +/- 0.02 mm
Working Distance (WD)0.069 mm
AR CoatingNIR - R under 0.5% at 790-990 nm
NOTEOther lens design and AR coating are available upon request
Diode Aspect Ratio1 : 5
Design Wavelength976 nm
ReferenceGlassWD (mm)Height (mm)Thickness (mm)Add to request
D142-0402S-TiH530.0690.5000.500