Re: Most efficient laser?
- From: Richard Saam <rdsaam@xxxxxxx>
- Date: Mon, 28 Apr 2008 21:06:43 GMT
Phil Hobbs wrote:
Richard Saam wrote:Question:
What is the most efficient laser
as far as (power output) / (power input)
It could be expressed in many units
perhaps:
photons/watt
Richard D. Saam
In photons per watt, a CO2 laser is almost certainly the champ. It's about the most efficient gas laser around, watt for watt, and its photons are about 20 times less energetic than visible ones, so you get a boost of 20x right there.
In terms of (beam power)/(wall plug power), diode lasers win hands down--slope efficiencies of over 25% are common.
Cheers,
Phil Hobbs
Thanks for the reply
In a possible related matter,
on page 639 of HECHT Optics
the concept of Self-Focusing of Light is addressed.
Quote:
"When a dielectric medium is subjected to an electric field
that varies in space (laser beam),
an internal force will result."
"This has the effect of altering
the medium permittivity (refractive index)
causing the medium to act as a positive lens
increasing the flux density over the incident laser beam.
UnQuote
The HECHT quote assumes a material medium.
QUESTION:
Is there a geometric arrangement
of intersecting (standing wave?) laser beams
(with defined cross section >> laser wave length^2)
which would create a dielectric medium (volume)
which would have the above self-focusing properties
within the medium (volume)
to the incident beams?
Intuitively, it would appear the more photons the better effect.
Richard D. Saam
.
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