27 results found for optica

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00:31:00

The Adventure of Cold Atoms. From Optical Pumping to Quantum Gases

by Claude Cohen-Tannoudji
The Adventure of Cold Atoms. From Optical Pumping to Quantum Gases
for 18-22 e para cima,
Palestras | 18-22 e para cima | 8 years ago | 1328 views
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Conservation laws are very important in quantum physics. Two examples of applications will be given. First, optical pumping which uses transfer of angular momentum from polarized photons to atoms to produce highly polarized atomic gases. Then, laser ....

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00:35:00

Science with Combs of Light

by Theodor Hänsch
Science with Combs of Light
for 18-22 e para cima,
Palestras | 18-22 e para cima | 8 years ago | 1569 views
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The spectrum of a frequency comb, commonly generated by a mode-locked femtosecond laser, consists of several hundred thousand precisely evenly spaced spectral lines. Such laser frequency combs have revolutionized the art of measuring the frequency of....

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00:33:00

Nanoscopy – allowing molecules to be examined inside living cells

by Eric Betzig
Nanoscopy – allowing molecules to be examined inside living cells
for 18-22 e para cima,
Palestras | 18-22 e para cima | 8 years ago | 2860 views
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Eric Betzig shared the 2014 Chemistry Nobel prize with fellow American William E. Moerner and Romanian-German Stefan W. Hell for revolutionising science through the development of super-resolved fluorescence to exceed the accepted limits of tradition....

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00:32:00

Fun with Light and Single Molecules

by William Moerner
Fun with Light and Single Molecules
for 18-22 e para cima,
Palestras | 18-22 e para cima | 8 years ago | 1236 views
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More than 25 years ago, single molecules were first detected optically, but how do we really detect a single molecule today, and what good is it? It is an amazing fact that you can even detect single molecules with your own eyes. When a new regime of....

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00:35:00

How to Synthesize a Wide Variety of Optically Active Compounds with >99% Optical Purity

by Ei-ichi Negishi
How to Synthesize a Wide Variety of Optically Active Compounds with >99% Optical Purity
for 18-22 e para cima,
Palestras | 18-22 e para cima | 8 years ago | 1460 views
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The discovery and synthetic applications of a widely applicable and highly enantioselective (>99% ee) protocol consisting of the 'ZACA reaction' (Zr-catalyzed asymmetric carboalumination of alkenes), purification of the ZACA-products by lipase-cat....

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00:28:00

Optical Microscopy – the Resolution Revolution

by Stefan Hell
Optical Microscopy – the Resolution Revolution
for 18-22 e para cima,
Palestras | 18-22 e para cima | 8 years ago | 1245 views
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Throughout the 20th century it was widely accepted that a light microscope relying on conventional optical lenses cannot discern details that are much finer than about half the wavelength of light (200-400 nm), due to diffraction. However, in the 199....

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00:07:00

Can nanocrystals stop the climate change?

by Frank Riehle
Can nanocrystals stop the climate change?
for 14-19 e para cima,
Palestras | 14-19 e para cima | 8 years ago | 2711 views
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Fossil resources are limited and their CO2 emission strongly contributes to the global warming which is mainly responsible for the increasing appearance of natural catastrophes. Renewable biomass which can be converted into various forms of usable en....

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01:04:00

Communicating with light

by Polina Bayvel
Communicating with light
for 14-19 e para cima,
Palestras | 14-19 e para cima | 9 years ago | 1381 views
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Most of the data we generate and receive (whether emails, tweets, videos or mobile calls) are now carried by optical fibres, which use light to transmit vast quantities of information over trans-oceanic distances. The use of hundreds of wavelengths ....

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00:32:00

The Optical Frequency Comb – a Really Versatile Tool

by John Hall
The Optical Frequency Comb – a Really Versatile Tool
for 18-22 e para cima,
Palestras | 18-22 e para cima | 9 years ago | 1387 views
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The Optical Frequency Comb concept and technology exploded in 1999-2000 from the synthesis of advances in independent fields of Laser Stabilization, UltraFast Lasers, and NonLinear Optical Fibers. The Comb was developed first as a method for optical....

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00:33:00

Cold Atomic Gases: the Intersection of Condensed Matter and Atomic Physics

by William Phillips
Cold Atomic Gases: the Intersection of Condensed Matter and Atomic Physics
for 18-22 e para cima,
Palestras | 18-22 e para cima | 9 years ago | 1556 views
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During the past decade laser cooling and evaporative cooling of atoms have produced quantum degenerate gases both of bosons (Bose-Einstein condensates) and of fermions (gases with temperatures below the Fermi temperature). Such gases can provide ana....

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00:39:00

You can see a lot by observing: Optical Microscopy 2.0

by Steve Chu
You can see a lot by observing: Optical Microscopy 2.0
for 18-22 e para cima,
Palestras | 18-22 e para cima | 9 years ago | 1426 views
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Biological research and medicine were transformed by the invention and improvement of the optical microscope. Since the early 1990s, there has been another revolution in optical imaging, and manipulation of individual biological molecules and bio-mo....

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00:34:00

What Can We Do with Laser Frequency Combs?

by Theodor Hänsch
What Can We Do with Laser Frequency Combs?
for 18-22 e para cima,
Palestras | 18-22 e para cima | 9 years ago | 1525 views
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The spectrum of a frequency comb, commonly generated by a mode-locked femtosecond laser consists of several hundred thousand precisely evenly spaced spectral lines.  Such laser frequency combs have revolutionized the art measuring the frequency of l....

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