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Blobrana


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Nanoscale laser
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Threshold broken for tiny lasers

Scientists have shown off the smallest-ever laser that works at the colours of light used in telecommunications and at room temperature.
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Blobrana


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Laser
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Laser is produced by a living cell

A single living cell has been coaxed into producing laser light, researchers report in Nature Photonics.
The technique starts by engineering a cell that can produce a light-emitting protein that was first obtained from glowing jellyfish.
Flooding the resulting cells with weak blue light causes them to emit directed, green laser light.
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Blobrana


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Biological Laser
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Title: Single-cell biological lasers
Authors: Malte C. Gather & Seok Hyun Yun

Since their invention some 50 years ago, lasers have made a tremendous impact on modern science and technology. Nevertheless, lasing has so far relied on artificial or engineered optical gain materials, such as doped crystals, semiconductors, synthetic dyes and purified gases. Here, we show that fluorescent proteins in cells are a viable gain medium for optical amplification, and report the first successful realisation of biological cell lasers based on green fluorescent protein (GFP). We demonstrate in vitro protein lasers using recombinant GFP solutions and introduce a laser based on single live cells expressing GFP. On optical pumping with nanojoule/nanosecond pulses, individual cells in a high-Q microcavity produce bright, directional and narrowband laser emission, with characteristic longitudinal and transverse modes. Lasing cells remained alive even after prolonged lasing action. Light amplification and lasing from and within biological systems pave the way to new forms of intracellular sensing, cytometry and imaging.

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Blobrana


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Posts: 131433
Date:
Laser spark plugs
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Lasers could replace spark plugs in car engines

Car engines could soon be fired by lasers instead of spark plugs, researchers say.
A team at the Conference on Lasers and Electro-Optics will report on 1 May that they have designed lasers that could ignite the fuel/air mixture in combustion engines.
The approach would increase efficiency of engines, and reduce their pollution, by igniting more of the mixture.
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Blobrana


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Posts: 131433
Date:
Handy Laser
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Engineers in Germany unveil a portable battery-powered laser marking instrument.
Compact Laser Solutions (CLS) of Germany has developed an A4-sized, battery powered laser marking device that weighs just 6 kg and can be used to permanently tag and verify parts already in service.



Available as a portable laser head that delivers up to 10 W of continuous wave 1064 nm emission, or up to 5 W of 532 nm output, the unit's control box is no bigger than a cd-walkman.
The Berlin-based firm claims that its air-cooled laser is practically maintenance free and comes with a re-chargeable battery back giving up to one hour of continuous laser marking.

"The laser can cut thin metal sheets. It also gives the opportunity for welding plastic or synthetic materials" - Thomas Parchmann of CLS.
Dubbed Nucleon, the company offers the marking device complete with a CCD camera and scanning system that recognizes barcodes and 2D data formats. As Parchmann explained, the set-up is perfect for large maintenance programs where components that are already in service must be marked in the field.
Due to begin production later this year, CLS plans to launch its portable unit in January 2006.


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