Re: 5+5 <= 10
- From: Kai-Martin <kmk@xxxxxxxxxxxxxxx>
- Date: Wed, 21 Jun 2006 21:11:25 +0200
<Sam> wrote:
If we use say two 5mW laser diodes and some-how (I do not know how)
combine their output, can we obtain approximatelly 10mW laser?
Take a polarizing beam splitter cube. Put a diode laser in front of two
perpendicular faces. Turn the diode laser so that their beams will go
completely straight through the cube. Put a lamda/2 wave plate between
the cube and one of the diode lasers. Turn the polarization of this laser
beam until it will be almost completely bent by the cube. Now, both beams
leave the same face of the beam splitter.
The power of this combined beam will be almost the sum of the single powers.
It is "almost", because there are some losses at the faces of beam splitter
and wave plate.
However, the combined beam is not identical to one of a stronger laser.
If alignment is not perfect, the two portions may seperate further down the
line. The lasers won't work at exactly the same frequency. The respective
frequency will change independently. This will result in an erratic state
of polarization. If you place a polarize in the combined beam you may
observe interferometric beats. You have to look closely at your application
to decide wether the combined beam is useful for you.
---<(kaimartin)>---
--
Kai-Martin Knaak
kmk@xxxxxxxxxxxx
http://lilalaser.de/blog
.
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