Externet
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Hello.
Some laser pointers feature lens to produce a line instead of a dot. Seem cylindrical or fresnel. What factor changes the divergence angle ?
Distance from emitter to lens ? Diametre of lens ? Am after ~5 to ~10 degrees divergence; what I see on inexpensive sources are far more divergent, like 90, 120 degrees. Can a glass rod create the same effect ?
Typical in 'toy' pointers :
Others :
Line rendering :
Some laser pointers feature lens to produce a line instead of a dot. Seem cylindrical or fresnel. What factor changes the divergence angle ?
Distance from emitter to lens ? Diametre of lens ? Am after ~5 to ~10 degrees divergence; what I see on inexpensive sources are far more divergent, like 90, 120 degrees. Can a glass rod create the same effect ?
Typical in 'toy' pointers :
Others :
Line rendering :