yoonie
Member
- Joined
- Aug 11, 2019
- Messages
- 30
- Points
- 8
Hi guys,
Tl;dr :
How important is it to consider beam thickness and divergence for a similar powered laser if we want lots of brightness/visibility.
--------------------------------
More context :
I'm new to single diode laser, and searching I'm trying to understand more.
With DPSS 532, at some point most laser were offering pretty thin beam and low divergence, now single diode seem to have a wide range of choice, which is making thing more complicated to choose a diode.
I assume I know the basics about brightness regarding wavelenghts, human vision, atmospheric condition, output non linear ratio to brightness.
Now for the question :
let's say we have 2 setup, both have their diode and driver are calibrated to deliver 100mW of 520nm,
one will have a 0.8 mrad div and very thin beam
the other would have a 2.5 mrad div and wide beam over 2mm
I assume this hypothesis would work as the DPM would be close enough that the sensor would still get all the output power and not be affected by divergence (you can correct me if I'm wrong there)
But from a few meters away, I would assume it could make a real difference in brightness as having same power trying to make their impact on air molecules for one the area it will have to lit up would be considerbly larger, hence a loss of brightness.
(sub question in there is, wouldn't a 100mw 532 dpss be brighter than an hypothetical single diode 532nm as DPSS still seem to offer best beam profile? (not even talking in the loss from artifact which seem greater in single mode)
Sorry for the long question which the answer is probably scattered through post already made, but couldn't find them.
cheers
Tl;dr :
How important is it to consider beam thickness and divergence for a similar powered laser if we want lots of brightness/visibility.
--------------------------------
More context :
I'm new to single diode laser, and searching I'm trying to understand more.
With DPSS 532, at some point most laser were offering pretty thin beam and low divergence, now single diode seem to have a wide range of choice, which is making thing more complicated to choose a diode.
I assume I know the basics about brightness regarding wavelenghts, human vision, atmospheric condition, output non linear ratio to brightness.
Now for the question :
let's say we have 2 setup, both have their diode and driver are calibrated to deliver 100mW of 520nm,
one will have a 0.8 mrad div and very thin beam
the other would have a 2.5 mrad div and wide beam over 2mm
I assume this hypothesis would work as the DPM would be close enough that the sensor would still get all the output power and not be affected by divergence (you can correct me if I'm wrong there)
But from a few meters away, I would assume it could make a real difference in brightness as having same power trying to make their impact on air molecules for one the area it will have to lit up would be considerbly larger, hence a loss of brightness.
(sub question in there is, wouldn't a 100mw 532 dpss be brighter than an hypothetical single diode 532nm as DPSS still seem to offer best beam profile? (not even talking in the loss from artifact which seem greater in single mode)
Sorry for the long question which the answer is probably scattered through post already made, but couldn't find them.
cheers