A question about circularly polarized light - circularly polarized light

 2024-09-02 05:40:17

Een schaapskudde in Heerde doet zich tegoed aan de in bloei staande heide in natuurgebied Renderklippen || A sheep herd in Heerde feasts on the in blooming heather in nature reserve Renderklippen

The typically 12-16MP images you get are missing a lot of real details (besides the fake sharpness impression). The 50MP these sensors can also produce look good at afirst glance but a closer look shows the same problems as with their smaller siblings (lot of noise reduction and ege "enhancement" after that). But when you scale down the 200MP to half the resolution resulting in also 50MP you get a quite pleasing look with much more real details.

Extreme precision on a tiny scale is also a very welcome development in the field of laser eye surgery. Thanks to developments in laser physics that were kick-started by Strickland and Mourou’s work, it is now possible to carefully sculpt and shape the cornea (the transparent layer at the front of the eye) with minimal invasiveness, improving the vision of millions of people around the world every year.

Photo taken in Cornwall UK at the Tamar river by Cotehele Quay, a very quiet area with attractive photo spots and incredibly beautiful light. Just in the tree line is Lime Klins.

Over the dyke under a blue sky with white clouds and a shining sunUsed an old Canon EF 35-135mm f/4-5.6 USM lens, after more then 25 years still doing a good job. Thanks for all the faveds and comments, even for just taking the time to view my photo's, much appreciated.

Not as sharp and clear as most of my images - the egret was 300m away; the image is a crop of a 50MP handheld highres capture.

Proof that I have a softer side, regretfully the proof doesn’t extend to me actually knowing the species of flower but I do know that I shot it handheld using the Olympus’ 50mp high res mode

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Founded in 1246 by the Earl of Cornwall, Hailes Abbey is set amid delightful Cotswold countryside. Once the centre of monastic life, the tranquil ruins are now the perfect place to relax and enjoy a picnic in a unique historic setting. Visit the new museum to discover the treasures of Hailes, uncovering stories of the monks who lived and worshipped at the abbey for nearly three centuries.

Samrtphone cameras can produce already 200MP images. Typically this output is way too high to directly post it. So why even shoot images in this resolution?

Een schaapskudde in Heerde doet zich tegoed aan de in bloei staande heide in natuurgebied Renderklippen || A sheep herd in Heerde feasts on the in blooming heather in nature reserve Renderklippen

Saying goodbye to the sun and sliding into the night. Thanks for all the faves and comments, even for just taking the time to view my photo's, much appreciated.

Sited to the right of Derby cathedral entrance. This is a 50mp handheld hi-res from the Olympus EM1.3 and the Zuiko 17mm f1.2

Not as sharp and clear as most of my images - the egret was 300m away; the image is a crop of a 50MP handheld highres capture.

My brother was showing his photos on the television. I took a photo of his photo. I can't remember the name of this finch. My brother's camera gave exquisite photos of 50Mp. Wish I had the original. His photo files for one picture are huge. On his very large television screen, you could see every fibre of the feathers even when you zoomed in and made the bird as big as the screen, the detail was amazing. My photo shows more of a blur because the televison screen had shimmering lines all the time. If I get the original I will post it to show the image he actually captured.

Proof that I have a softer side, regretfully the proof doesn’t extend to me actually knowing the species of flower but I do know that I shot it handheld using the Olympus’ 50mp high res mode

Here's a new one for me. He was so far away I couldn't even see color till I looked through my viewfinder at 840mm. Then I cropped a bunch - nice to have 50mp to start with. My birdie book describes him as "common in any brushy or weedy habitat, especially along streams in arid regions." That pretty well describes it, except for the "common" part. A first for me at my local regional park, or anywhere for that matter.

on a warm winter day. Thanks for all the faves and comments, even for just taking the time to view my photo's, much appreciated.

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This was taken at my local country park the dog leapt off a fishing staging after a ball that had been thrown in by its owner. Its a rescue dog by the way :)

The more energy you pump into the laser to get those atoms all excited, the greater the intensity of the light. It’s a little like turning up the volume dial on a sound system. Turn that volume up too high, though, and you risk causing damage (either to the sound system itself, or to your hearing!).

They’ve been on the scene since the early 1960s when researchers first started theorising and experimenting with compressed, controlled beams of light energy. During the first few years since their invention, development of more powerful pulsed lasers continued rapidly.

Lasers. We use them for communications, surgery, law enforcement, entertainment, printing, engraving, measuring, researching … the list of applications is seemingly endless.

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But then researchers hit a wall. The powerful lasers they were trying to build had a nasty habit of damaging the machinery being used to generate them. Progress stalled for over a decade. Then, in the mid-1980’s, Donna Strickland and Gérard Mourou came up with a new way to make lasers that changed everything … and in 2018, their work was recognised with a Nobel Prize for Physics (alongside Arthur Ashkin’s development of ‘optical tweezers’ – more laser physics).

An ‘excited’ atom has absorbed enough energy to jolt it from its normal resting ‘ground’ state into a higher-energy ‘excited’ state. Excited atoms will naturally want to return to their normal lower-energy ‘ground’ state. In the process, they’ll spontaneously release their extra energy by emitting a particle of light called a photon.

Lasers basically work by getting a bunch of atoms all excited. You can ‘excite’ an atom with a flash of light, through causing collisions between atoms, or by supplying electricity.

on a cloudy summer evening. Does anyone knows why a 50 mp picture is coming out of lightroom at only 16 mb, please give me some insight, thanks.

If you send even more energy towards an already-excited atom, it jumps back to a lower-energy state, but releases two identical photons with the same colour, level of energy, and direction of movement. This process (called ‘stimulated emission’) allows you to increase the intensity of light. Bouncing the light between two carefully-aligned mirrors will drive a chain reaction of excited atoms exciting other atoms, triggering the formation of a cascade of identical photons and amplifying the light more and more. By letting some of that light escape on one side, we end up with light that consists of just one colour, travelling in one direction in a narrow, focused beam: a laser.

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The final step is to take all of that boosted power and compress it outside the amplifier back into a short, sharp, fast burst of light. All of that amplified energy is packed into a small space and short pulse, upping the intensity yet again. The result is a laser pulse that packs a real punch.

Photo taken in Cornwall UK at the Tamar river by Cotehele Quay, a very quiet area with attractive photo spots and incredibly beautiful light. Just in the tree line is Lime Klins.

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As the pulse travels through the amplifier, it’s time to turn up the volume and make the pulse bigger. This produces a pulse that is still stretched out in time but with its power increased significantly.

Samrtphone cameras can produce already 200MP images. Typically this output is way too high to directly post it. So why even shoot images in this resolution? The typically 12-16MP images you get are missing a lot of real details (besides the fake sharpness impression). The 50MP these sensors can also produce look good at afirst glance but a closer look shows the same problems as with their smaller siblings (lot of noise reduction and ege "enhancement" after that). But when you scale down the 200MP to half the resolution resulting in also 50MP you get a quite pleasing look with much more real details.

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on a cold but even so great winter morning where the rising sun melts the ice and give some color to this little village of mine.

This is the problem researchers faced before Strickland and Mourou’s discovery: as they increased the amplification of their lasers, they reached a point where the intensity of the short, sharp pulses of light with their bunched-together photons was too much, damaging the amplification equipment itself.

Laser light is different to the light you get from a regular old lamp or an LED: all the waves of light run parallel to each other, rather than scattering in all directions; there’s only one specific colour and wavelength; and it can be fired as a series of short, intense pulses.

The solution was to modify the length of the pulses of light energy so that the intensity was spread out more evenly as it moved through the amplifier. The technique, called ‘chirped pulse amplification’ (CPA for short), involves three main steps: stretch a short light pulse out in time and space, amplify it, then compress it again.

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My brother's camera gave exquisite photos of 50Mp. Wish I had the original. His photo files for one picture are huge. On his very large television screen, you could see every fibre of the feathers even when you zoomed in and made the bird as big as the screen, the detail was amazing. My photo shows more of a blur because the televison screen had shimmering lines all the time.

What else will be possible in the future with extremely intense, fast pulses of light? There’s a long list of potential applications, both for research and industry. Gérard Mourou and Donna Strickland’s ‘chirped pulse amplification’ techniques have opened the door to harnessing the power of light to measure and manipulate our world: a development well and truly worthy of such high acclaim.

This breakthrough opened up several new areas of research in laser physics and a whole bunch of new practical applications. A very intense, very short laser pulse allows for extremely high precision on very small scales. High-quality devices such as the stents doctors insert into arteries, or some of the components in a smartphone, can only be produced with the ultra-short pulses of laser machining.

A handheld high resolution shot with the OM-D EM1 mk3 Processed with OM Workspace. This results in a 50mp file. Zoom in beneath the clouds, then down to the grass.

Stretching the pulse in time reduces its intensity. Different components of the pulse reach different parts of the amplifier at slightly different times, spreading out the load and reducing the damage.

This was taken at my local country park the dog leapt off a fishing staging after a ball that had been thrown in by its owner. Its a rescue dog by the way :)

on a cold but even so great winter morning where the rising sun melts the ice and give some color to this little village of mine. Thanks for all the faves and comments, even for just taking the time to view my photo's, much appreciated.

Ultrashort pulses also allow us to study events taking place at the level of individual atoms, and the emerging field of attosecond physics (an attosecond is one billionth of a billionth of a second) takes us even further in being able to observe and control individual electrons around those atoms.