My 100mw red laser

[geo-r]

I have a 100mw red laser but i dont know if its real 100mw.I supply it with 3.7-4v through a lithium-ion battery.Maximum voltage i can supply it is 5v.To be able to burn a match it need to focus the beam with a magnifier lens.Is this normal for red laser?I mean i see green laser that at 100mw burn  a match without the need of a magnifier lens .

 

[Switch]

Yea it's normal because red lasers have bigger beam diameter and thus less irradiance.

 

[Razako]

Entirely normal. My pulsar125 struggles to melt black plastic bags without the focusing cap on it. 4mm beam diameter simply sucks at burning unless you focus it.

 

[geo-r]

Entirely normal.  My pulsar125 struggles to melt black plastic bags without the focusing cap on it.  4mm beam diameter simply sucks at burning unless you focus it.

Is it a way to focus the beam but not only in one point.I mean focus the beam in short and long distance?

 

[Deleted member 13229]

[quote author=Razako link=1204544461/0#2 date=1204577656]Entirely normal. My pulsar125 struggles to melt black plastic bags without the focusing cap on it. 4mm beam diameter simply sucks at burning unless you focus it.

Is it a way to focus the beam but not only in one point.I mean focus the beam in short and long distance?[/quote]
Nope, unfortunately the thing called "divergence" screws us all over, stupid laws of physics