Thank you for the answer Kerry. So how much power would be needed to
come within a true 5mw with a 635nm line generating (no pulse) laser
if you are treating a subject within about a 2 foot range (trying to
cover a large muscle group)? I realize I am asking a rather nebulous
question because there are so many other factors as you and Sean
mentioned. I am just trying to arrive at a ballpark figure to know
how much power is needed with a line laser to get fast results and
stay within the true 5mw biostimulating range by the time it reaches
the subject. 20mw? 50mw? Perhaps you have a formula that could give a
rough estimate. Thanks again.

Steve


--- In Therapeutic-Laser_Therapy@yahoogroups.com, "Kerry Tume"
<laserbio@...> wrote:
>
> Hi Steve,
>
> Your logic is correct. Many manufacturers state the output power as
per the laser diode they are using. Thus a 5mw Sanyo diode operating
at it's required current drive will put out 5mw. However, if you then
use collimating or focussing optics, or a line generating optic,
there will be some power loss through the optics.
>
> This can be in the order of 25%, thus the available ouput power in
this hypothetical case is now 3.75 mw.
>
> Most laser diodes emit an elliptical beam with the vertical axis
having a divergency of say 30 degrees and the horizontal axis having
a divergence of say 12 degrees.
>
> Thue a manufacturer "spot" size may be stated at 1mm which unless
the system has suitable optics to create a circular spot,
this "stated" 1mm spot is more likely to be an ellipse shape with the
vertical length of the beam being 1mm whilst the horizontal length is
0.4mm.
>
> If a line generator lens is used then the beam could be 5mm x 1mm.
Both of these will be at a given distance from the face of the diode.
>
> This is where the problem comes in. As you move further away from
the tissue surface, the spot size (unless truly collimated to produce
a minimally divergibg beam) then becomes larger the further away from
the tissue surface.
>
> Line generators can also suffer this problem, so the further away
from the tissue surface, the longer & wider the line.
>
> You still have the original output power, but the Power Density on
the tissue surface decreases dramatically the further you move the
treatment tip away.
>
> Given the two examples above, the "Spot" of 1mm x 0.4mm with an
output power of 3.75mw (after the lens system) has a Power Density of
1.19 Watts/cm2
>
> The "Line" of 5mm x 1mm (at 3.75mw) has a Power Density of 0.075
Watts/cm2. Thus the line version has to be applied 15.86 times longer
to deliver the same Power Density.
>
> Thus your point about the higher power Laser diode eg 20mw being
used to minimise these factors is valid. More importantly, the
manufacturer should state the exact output power at the treatment
face ie where the laser is applied to the tissue. You also need to
know the duty cycle if the laser is pulsed as again this will affect
the "mean average" output power which in turn affects the treatment
time for required Dosages.
>
> Trust this helps,
>
> Kerry
>
> Kind Regards
> Kerry Tume
> M.Ac.F. M.I.L.A. ACONT
> NAALT WALT LIA
> ----- Original Message -----
> From: Jennifer Ruby
> To: Therapeutic-Laser_Therapy@yahoogroups.com
> Sent: Wednesday, March 15, 2006 1:34 AM
> Subject: Re: [Therapeutic-Laser_Therapy] Line vs Dot and power
output question..
>
>
> Hi Steve!
>
> I don't know the answer to this question.... Hoping someone with
laser
> manufacturing wisdom will give some insight to this question.
>
> Health, Hope, Joy & Healing :
> May you Prosper, even as your Soul Prospers 3John 2
>
> Jennifer Ruby
>
> Email advice is not a substitute for medical treatment.
>
> http://www.rubysemporium.com
> http://groups.yahoo.com/group/SymphonicHealth
> http://groups.yahoo.com/group/Therapeutic-Laser_Therapy
> http://www.lazrpulsr.com
> ______________________________________________
> «¤»¥«¤»§«¤»¥«¤»§«¤»¥«¤»§«¤»¥«¤»§«¤»¥«¤»§«¤»¥«¤
> ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
> ----- Original Message -----
> From: "esl5552001" <SCL555@...>
> To: <Therapeutic-Laser_Therapy@yahoogroups.com>
> Sent: Monday, March 13, 2006 1:56 PM
> Subject: [Therapeutic-Laser_Therapy] Line vs Dot and power output
question..
>
>
> | I have noticed that some lasers on the market (635nm healing
lasers)
> | use a dot and some lasers use a line. I have heard it said that
if you
> | are using a 5mw line then you are losing a significant amount
of power.
> | For instance the Erchonia is said to only produce .6mw output
of power
> | at the aperture. Wouldn't it make sense to just use 15-20mw
diode (or
> | whatever it takes) until you arrive at the desired 5mw output
at the
> | aperture for a line generated laser? Then you could cover more
area in
> | less time with greater effect using a true 5mw. Just trying to
arrive
> | at the bottom line of all this laser tech(pun intended).
> |
>
>
>
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