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J10919_15 Datasheet, PDF (1/2 Pages) Hamamatsu Corporation – FAC LENS (Fast-Axis Collimating Lens)
FAC LENS
NEW (Fast-Axis Collimating Lens)
J10919 SERIES
OVERVIEW
The J10919 series FAC lens is an optical lens that collimates light
spreading from a semiconductor laser in the fast-axis direction.
Semiconductor lasers have a large divergence angle in the fast-
axis direction, so the output light cannot be efficiently used unless
collimated. The FAC lens collimates light spreading from a semi-
conductor laser into a narrow beam with a radiation angle of sev-
eral milliradians (mrad) or less so that the diverging light can be
efficiently utilized.
COLLIMATING LIGHT
Radiation angle spreading in elliptical cone shape
Laser emitting point
LD (laser diode) bar
FAC lens
LD (laser diode) bar
Fast axis
Laser emitting point
FEATURES
GAspheric micro-cylindrical lens
GHighly efficient utilization of light from LD bar
GSmall variations in characteristics allow mass production
GMinimized smile and side lobes due to high-precision fabricating technology
OUTPUT DISTRIBUTION IMAGE WHEN INSTALLED TO LD BAR
A
Radiation angle axis
A'
A–A' PROFILE
100
90
80
70
60
50
40
30
20
10
0
-5 -4 -3 -2 -1 0 1 2 3 4 5
RADIATION ANGLE (mrad)