Externet
Advanced Member level 2
- Joined
- Jan 29, 2004
- Messages
- 574
- Helped
- 28
- Reputation
- 58
- Reaction score
- 29
- Trophy points
- 1,308
- Location
- Mideast US
- Activity points
- 5,603
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 :