Do battery affect the brightness of a laser?

[hertzamplifier]

I mean like if the battery become weaker,will they affect the brightness of a green laser.Like the green line visibility will decrease if the battery supply getting weaker?:thinking:

 

[Tech_Junkie]

Depends on driver. A boost drive will usually die when the batteries are below it rated voltage. Around 1.2v I think. A linear drive will sag as the voltage sags. Greens usually use boost I believe.

Sometimes greens fade for not good reason. When this happens, and it will happen a lot, clean the threads and contact points with a pencil eraser.

 

[HIMNL9]

Sorry for correct you TJ ..... usually green modules uses linear drivers with op-amp control ..... only the ones that are designed for work with a single 1,5V battery have boost drivers .....

Anyway, about the battery question, it depend mainly of how it's good the driver ..... if is a true constant current driver, it's usually affected from scarce / low charge batteries (it fade when the battery is at low charge, cause it cannot feed enough current), but not for the opposite (i mean, also if the battery is overcharged, the driver still regulate the current in good way) ..... but there are some "bad" drivers, around, like some of the "old style" dilda ones, that was using a resistor for decrease the voltage and dissipation of the regulator, that had the bad abitude to push the diodes at higher outputs when rechargeable li-ion batteries was used in place of non rechargeables ones (7,2 to 8,4V instead 6V, from 2 cells), and these drivers may put at risk the diodes .....

And, ofcourse, "false drivers" or resistors used in place of real drivers can kill your diodes, with the wrong type of batteries .....

 

[Tech_Junkie]

Sorry for correct you TJ .....

NP, my forte is Blu-Ray. I shouldn't give advice about stuff I dont know. That's why the "I think". Thanks for the info, now I know.

 

[hertzamplifier]

Sorry for correct you TJ ..... usually green modules uses linear drivers with op-amp control ..... only the ones that are designed for work with a single 1,5V battery have boost drivers .....

Anyway, about the battery question, it depend mainly of how it's good the driver ..... if is a true constant current driver, it's usually affected from scarce / low charge batteries (it fade when the battery is at low charge, cause it cannot feed enough current), but not for the opposite (i mean, also if the battery is overcharged, the driver still regulate the current in good way) ..... but there are some "bad" drivers, around, like some of the "old style" dilda ones, that was using a resistor for decrease the voltage and dissipation of the regulator, that had the bad abitude to push the diodes at higher outputs when rechargeable li-ion batteries was used in place of non rechargeables ones (7,2 to 8,4V instead 6V, from 2 cells), and these drivers may put at risk the diodes .....

And, ofcourse, "false drivers" or resistors used in place of real drivers can kill your diodes, with the wrong type of batteries .....

Lol.I don't really understand some of your electronic explanation.Anyway my green laser are same brand as this one Laser Pointer | Products | Green Laser 1 but mine bought from shopping mall at my place and is 50mW(uses two tripleAAA battery).

So.do you think what kind of driver my laser pointer use?

 

[Tech_Junkie]

usually green modules uses linear drivers with op-amp control

^^^^^^^^^^^^^^^^^

 

[hertzamplifier]

So,linear drivers with op-amp control works like the Automatic Voltage Regulator?that is to make the output power remain constant.

For example if the battery are weak it increase the output and if the battery are overcharge it decrease the output?

 

[Tech_Junkie]

(it fades when the battery is at low charge, cause it cannot feed enough current), (if the battery is overcharged, the driver still regulate the current in good way)

Dude, he answered your questions. His post is not that hard to read.

 

[billg519]

It's like a flashlight or a radio really. Weak or bad batteries will degrade performance. Simply charge your batteries regularly, or replace them if they are disposable. With some drivers, the laser will suddenly stop dead when the batteries are too low. If your laser seems dead, step one is to try fresh, known-good batteries in it. Other drivers will fall out of regulation and lose power slowly as the batteries die. Do a search on drivers, there is lots of driver related info here on this site, also at Sams Laser FAQ too.

 

[scopeguy20]

Short answer, often times, YES! -Glenn

 

[Pontiacg5]

If it uses 2 AAA batteries and is green chances are it dims as the batteries do, but if it is a bluray running on 2 AAA it has to be a boost driver and will all the sudden stop when the batteries get too low.

If it is only 1 AAA it is going to be a boost driver and probably wont last long enough to tell if the batteries are low

 

[suthnland]

Hi Group,
By way of introduction I would like to say that I'm more passing through than participating in any reall discussions as I may not be in the right place here to discuss what I wish to discuss.

I have a serious question about lasers and am finding it rather difficult in locating an appropriate place for a suitable answer.

My involvement with lasers is in the detection of metallic colloids in solution and would like to know if there is anyone here who may be familiar with this concept.

As I do not wish to waist anyones time I should state from the outset that Electronics is not my field of interest or expertise but if anyone is familiar with this concept perhaps I could pose my query in a little more detail.

Thank You

Neville.

 

[Pontiacg5]

this isn't the place, make a new thread in experiements and modifications and you'll get more views

 

[suthnland]

Thank You for that.