[Laser] Mod Power to several lasers?

Sat, 30 Aug 2003 23:48:46 -0500

Have you just tried putting the diodes in series from one higher voltage
source ... that way they all have the same current and get the same
modulation ... but you would need aq higher source voltage etc to mrun them
all.
John Matz KB9II
----- Original Message -----
From: "Richard Burrows" <[email protected]>
To: <[email protected]>
Sent: Saturday, August 30, 2003 11:36 AM
Subject: [Laser] Mod Power to several lasers?


> Hi
>
> I wonder if anyone has an idea how to run six 5mw lasers from a circuit
similar to K3PGP's Tx modulator. I can get one diode running fine but then
as you add more diodes the current is shared unequaly between the diodes
(they take what they need)and then they blow!!!!!
> I could build a seperate K3PGP's Tx modulator for each diode and run them
in parallel, but driven from common mod source, but that  seems over
complicated.
> Has anyone any ideas or circuits they could point me to please.
>
> To explain my application -  6 IR  ex-CD lasers each behind its own 1inch
collimator lens all driven from same modulator, this  setup to be used for
cloud bounce comms. I got 4 working  all aligned to one spot , but current
was up very high and weakest one blew taking rest with it. Back to the
drawing board!
>
>
>                             Richard  G8BYI
>
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