'Using a novel method, beams of laser light can be deflected using air alone. An invisible grating made only of air is not only immune to damage from the laser light, but it also preserves the original quality of the beam, reports an interdisciplinary research team in the journal Nature Photonics. The researchers have applied for a patent for their method.'

https://phys.org/news/2023-10-air-deflect-lasers.html

On Mon, 9 Oct 2023 07:52:17 -0700 (PDT), Fred Bloggs
<bloggs.fredbloggs.fred@gmail.com> wrote:

>'Using a novel method, beams of laser light can be deflected using air alone. An invisible grating made only of air is not only immune to damage from the laser light, but it also preserves the original quality of the beam, reports an interdisciplinary research team in the journal Nature Photonics. The researchers have applied for a patent for their method.'
>
>https://phys.org/news/2023-10-air-deflect-lasers.html

What does

"a strong infrared laser pulse could be redirected in this way with an
efficiency of 50 percent"

mean? Did they lose half the laser power?

More press-release science. You could post those all day.

What's your current elecronics project?

On Monday, October 9, 2023 at 11:11:48 AM UTC-4, John Larkin wrote:
> On Mon, 9 Oct 2023 07:52:17 -0700 (PDT), Fred Bloggs
> <bloggs.fred...@gmail.com> wrote:
>
> >'Using a novel method, beams of laser light can be deflected using air alone. An invisible grating made only of air is not only immune to damage from the laser light, but it also preserves the original quality of the beam, reports an interdisciplinary research team in the journal Nature Photonics.. The researchers have applied for a patent for their method.'
> >
> >https://phys.org/news/2023-10-air-deflect-lasers.html
> What does
>
> "a strong infrared laser pulse could be redirected in this way with an
> efficiency of 50 percent"
>
> mean? Did they lose half the laser power?
>
> More press-release science. You could post those all day.

'Diffraction efficiency is the performance of diffractive optical elements – especially diffraction gratings – in terms of power throughput. It's a measure of how much optical power is diffracted into a designated direction compared to the power incident onto the diffractive element of grating.'

https://en.wikipedia.org/wiki/Diffraction_efficiency

That should have been obvious.

>
> What's your current elecronics project?

project

'an individual or collaborative enterprise that is carefully planned to achieve a particular aim.'

huh?

The idiot Fred Bloggs <bloggs.fredbloggs.fred@gmail.com> persisting in being an Off-topic troll...

--
Fred Bloggs <bloggs.fredbloggs.fred@gmail.com> wrote:

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> Oct 2023 07:52:17 -0700 (PDT)
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> Subject: Acoustic Control Of Laser Light
> From: Fred Bloggs <bloggs.fredbloggs.fred@gmail.com>
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The arsehole Fred Bloggs <bloggs.fredbloggs.fred@gmail.com> persisting in being an Off-topic troll...

--
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> From: Fred Bloggs <bloggs.fredbloggs.fred@gmail.com>
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The arsehole John Larkin <jl@997PotHill.com> persisting in being an Off-topic troll...

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> Subject: Re: Acoustic Control Of Laser Light
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John Larkin <jl@997PotHill.com> wrote:
> On Mon, 9 Oct 2023 07:52:17 -0700 (PDT), Fred Bloggs
> <bloggs.fredbloggs.fred@gmail.com> wrote:
>
>> 'Using a novel method, beams of laser light can be deflected using air
>> alone. An invisible grating made only of air is not only immune to
>> damage from the laser light, but it also preserves the original quality
>> of the beam, reports an interdisciplinary research team in the journal
>> Nature Photonics. The researchers have applied for a patent for their method.'
>>
>> https://phys.org/news/2023-10-air-deflect-lasers.html
>
> What does
>
> "a strong infrared laser pulse could be redirected in this way with an
> efficiency of 50 percent"
>
> mean? Did they lose half the laser power?
>
High frequency sound waves (above about 1 MHz) die off very fast in air.
They also cause only a very small index modulation, so getting decent
diffraction efficiency requires a long interaction region.

So the diffraction angle will be small.

Otherwise it’s a bog-standard acousto-optic
modulator.

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC /
Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics

On Monday, October 9, 2023 at 1:29:00 PM UTC-7, Phil Hobbs wrote:
> John Larkin <j...@997PotHill.com> wrote:
> > On Mon, 9 Oct 2023 07:52:17 -0700 (PDT), Fred Bloggs
> > <bloggs.fred...@gmail.com> wrote:
> >
> >> 'Using a novel method, beams of laser light can be deflected using air
> >> alone. An invisible grating made only of air is not only immune to
> >> damage from the laser light, but it also preserves the original quality
> >> of the beam, reports an interdisciplinary research team in the journal
> >> Nature Photonics. The researchers have applied for a patent for their method.'
> >>
> >> https://phys.org/news/2023-10-air-deflect-lasers.html

> High frequency sound waves (above about 1 MHz) die off very fast in air.
> They also cause only a very small index modulation, so getting decent
> diffraction efficiency requires a long interaction region.
>
> So the diffraction angle will be small.
>
> Otherwise it’s a bog-standard acousto-optic
> modulator.

Except, it will respond to air qualities.
Any pressure or composition changes will alter the acoustic wavelength and
the deflection amplitude(s).

One might use the effect to gain-switch a laser cavity?

whit3rd wrote:
-----------------------
> >
> > Otherwise it’s a bog-standard acousto-optic
> > modulator.
>
> Except, it will respond to air qualities.
> Any pressure or composition changes will alter the acoustic wavelength and
> the deflection amplitude(s).
>

** The speed of sound does not depend on air *pressure* but rather on it's temperature.
It follows very closely the sq.rt of the absolute temp value.
Wavelength follows the inverse rule.

Of course, a sudden pressure rise induces a temp rise causing very high SPL waves to become non linear.

........ Phil

The idiot whit3rd <whit3rd@gmail.com> persisting in being an Off-topic troll...

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The idiot Phil Allison <pallison49@gmail.com> persisting in being an Off-topic troll...

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The arsehole Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> persisting in being an Off-topic troll...

--
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

> Path: not-for-mail
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> Subject: Re: Acoustic Control Of Laser Light
> Date: Mon, 9 Oct 2023 20:28:52 -0000 (UTC)
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On Monday, October 9, 2023 at 7:46:55 PM UTC-7, Phil Allison wrote:
> whit3rd wrote:
> -----------------------
> > >
> > > Otherwise it’s a bog-standard acousto-optic
> > > modulator.
> >
> > Except, it will respond to air qualities.
> > Any pressure or composition changes will alter the acoustic wavelength and
> > the deflection amplitude(s).
> >
> ** The speed of sound does not depend on air *pressure* but rather on it's temperature.
> It follows very closely the sq.rt of the absolute temp value.
> Wavelength follows the inverse rule.

But the refractive index depends on air pressure (density of the gas).
One presumes the diffraction is off the refraction modulation.

The arsehole whit3rd <whit3rd@gmail.com> persisting in being an Off-topic troll...

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Phil Hobbs wrote:
===============
>>
> >> 'Using a novel method, beams of laser light can be deflected using air
> >> alone. An invisible grating made only of air is not only immune to
> >> damage from the laser light, but it also preserves the original quality
> >> of the beam, reports an interdisciplinary research team in the journal
> >> Nature Photonics. The researchers have applied for a patent for their method.'
> >>
> >> https://phys.org/news/2023-10-air-deflect-lasers.html
> >
> > What does
> >
> > "a strong infrared laser pulse could be redirected in this way with an
> > efficiency of 50 percent"
> >
> > mean? Did they lose half the laser power?
> >
> High frequency sound waves (above about 1 MHz) die off very fast in air.
> They also cause only a very small index modulation, so getting decent
> diffraction efficiency requires a long interaction region.
>
> So the diffraction angle will be small.
>
> Otherwise it’s a bog-standard acousto-optic
> modulator.
>

** See the authors original paper:

https://www.nature.com/articles/s41566-023-01304-y

....... Phil

The arsehole Phil Allison <pallison49@gmail.com> persisting in being an Off-topic troll...

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