Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



TECH SPACE
Using optical fiber to generate a two-micron laser
by Staff Writers
Lausanne, Switzerland (SPX) Oct 13, 2015


Camille Bres and Svyatoslav Kharitonov describe a cost-effective way to generate two-micron lasers, using only thulium-doped optical fibers instead of amplifiers and isolators. Image courtesy Alban Kakulya / EPFL. For a larger version of this image please go here.

In recent years, two-micron lasers (0.002 millimetre) have been of growing interest among researchers. In the areas of surgery and molecule detection, for example, they offer significant advantages compared to traditional, shorter-wavelength lasers. However, two-micron lasers are still in their infancy and not yet as mature as their telecom counterparts (1.55-micron).

Moreover sources currently used in labs are typically bulky and expensive. Optical fibre-based 2 micron lasers are an elegant solution to these issues. This is where researchers at Photonics Systems Laboratory (PHOSL) come in.

In an article published in Light: Science and Applications, the team of Camille Bres at EPFL described a way to design these lasers at a lower cost, by changing the way optical fibres are connected to each other. Thanks to the new configuration, they were able not only to produce very good 2 micron lasers, but also to do without an expensive and complex component that is normally required.

Bloodless surgery and long-range molecule detection
Two-micron spectral domain has potential applications in medicine, environmental sciences and industry. At these wavelengths, the laser light is easily absorbed by water molecules, which are the main constituents of human tissue. In the realm of high precision surgery, they can be used to target water molecules during an operation and make incisions in very small areas of tissue without penetrating deeply. What is more, the energy from the laser causes the blood to coagulate on the wound, which prevents bleeding.

Two-micron lasers are also very useful for detecting key meteorological data over long distances through the air. Not to mention that they are highly effective in the processing of various industrial materials.

To create a 2 micron fibre-laser, light is usually injected into an optical-fibre ring containing a gain region which amplifies 2 micron light. The light circulates in the ring, passing through the gain region many times thus gaining more and more power, until becoming a laser. For optimal operation, these systems include a costly component called isolator, which forces the light to circulate in a single direction.

At PHOSL, researchers built a thulium-doped fibre laser that works without an isolator. Their idea was to connect the fibres differently, to steer light instead of stopping it. "We plug a kind of deviation that redirects the light heading in the wrong direction, putting it back on track", said Camille Bres. This means no more need for the isolator, whose job is to stop light moving in the wrong direction, sort of like a traffic cop. "We replaced the traffic cop with a detour," said Svyatoslav Kharitonov, the article's lead author.

The new system not only proved to be less expensive than more traditional ones, it also showed it could generate a higher quality laser light. The explanation is as follows: the laser output gets purified because light interacts with itself in a very special way, thanks to the amplifying fibre's composition and dimensions, and the high power circulating in this atypical laser architecture.

"While the association of amplifying fibres and high power usually weakens traditional lasers performance, it actually improves the quality of this laser, thanks to our specific architecture", said Svyatoslav Kharitonov.

Publication: Light: Science and Applications, Isolator-free unidirectional thulium doped fibre laser

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

.


Related Links
Ecole Polytechnique Federale de Lausanne
Space Technology News - Applications and Research






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

Previous Report
TECH SPACE
Laser-based molecular fingerprinting
Munich, Germany (SPX) Sep 24, 2015
A team of researchers based at Ludwig-Maximilians-Universitaet (LMU) in Munich and the Max Planck Institute for Quantum Optics has developed an infrared laser that can be used to identify and quantify molecules in complex mixtures with high specificity and sensitivity. Researchers and regulators in many fields often need to detect and measure levels of specific substances in a sea of irrel ... read more


TECH SPACE
Lunar Pox

Space startup confirms plans for robotic moon landings

Asteroids found to be the moon's main 'water supply'

Russian scientist hope to get rocket fuel, water, oxygen from Lunar ice

TECH SPACE
Lakes on Mars - SETI Editorial

NASA outlines obstacles to putting a human on Mars

ASU Mars images star in 'The Martian'

Mars colonisation still far off: Amitabh Ghosh

TECH SPACE
UTMB developing guidelines for commercial space travel

Dog smartphone and dancing humanoids on show at HK Fair

Aerojet completes major review of Orion subsystems

They're Loving It: Cheeseburgers Will Be Added to ISS Menu

TECH SPACE
Latest Mars film bespeaks potential of China-U.S. space cooperation

Exhibition on "father of Chinese rocketry" opens in U.S.

The First Meeting of the U.S.-China Space Dialogue

China's new carrier rocket succeeds in 1st trip

TECH SPACE
International Space Agencies Meet to Advance Space Exploration

Meet the International Docking Adapter

NASA extends Boeing contract for International Space Station

Russian launches cargo spaceship to the ISS

TECH SPACE
Both passengers for next Ariane 5 mission arrive in French Guiana

Arianespace signs ARSAT to launch a new satellite for Argentina

Ariane 5 orbits Sky Muster and ARSAT-2

A satellite launcher for the Middle East

TECH SPACE
Hubble Telescope Spots Mysterious Space Objects

Exoplanet Anniversary: From Zero to Thousands in 20 Years

Mysterious ripples found racing through planet-forming disc

The Most Stable Source of Light in the World

TECH SPACE
Using optical fiber to generate a two-micron laser

Dielectric film has refractive index close to air

Northrop Grumman upgrading G/ATOR radar system

Raytheon's AESA 360-degree radar moves toward production




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement