Navigation Links
New unifying theory of lasers advanced by physicists
Date:5/27/2008

New Haven, Conn. Researchers at Yale and the Institute of Quantum Electronics at ETH Zurich have formulated a theory that, allows scientists to better understand and predict the properties of both conventional and non-conventional lasers, according to a recent article in Science.

The lasers that most people are familiar with emit a narrow beam of light in a fixed direction that has a well-defined wavelength and a predictable power output like those in laser pointers, bar-code readers, surgical instruments and CD players, said senior author A. Douglas Stone, the Carl A. Morse Professor of Applied Physics at Yale.

In these conventional lasers, the light is trapped and amplified between parallel mirrors or interfaces and bounces back and forth along one dimension. Scientists can determine what the light output will be based on the leakiness of the mirrors, which is usually quite small.

But, a new breed of lasers diffusive random lasers (DRLs) made possible by modern nanofabrication capabilities, consist of a simple aggregate of nanoparticles and have no mirrors to trap light. These lasers were pioneered by Hui Cao, now a professor of applied physics at Yale, and have been proposed for applications in environmental lighting (laser paint), medical imaging and displays. Until now, there has been no simple way for scientists to predict the wavelengths and intensities of the light emitted by DRLs.

Although, superficially, conventional lasers and DRLs appear to operate very differently, experimental results indicated many basic similarities, and scientists have searched for a unifying description that would apply to all lasers.

The properties of a laser are determined by measuring the lasing modes, including the pattern of light intensity within the laser, and the wavelengths of light it puts out. With conventional lasers, these modes can easily be obtained through simulations.

For random lasers, time-dependent simulations are difficult to do, hard to interpret, and don't answer the question: What is the nature of the lasing modes in a random laser, according to Stone. Researchers really wanted a description similar to that for conventional lasers, but no one knew how to develop such a description.

To create their unifying theory, the researchers derived a wholly new set of non-linear equations that fit both conventional and non-conventional lasers such as the DRL or other nanostructured lasers. Based on these equations Stone, his former PhD student Hakan Tureci, now at ETH Zurich, and two other members of Stones research group, Li Ge and Stefan Rotter, created a detailed computer code that can predict all the important properties of any kind of laser from simple inputs.

The state of laser theory after forty years was an embarrassment; it was essentially qualitative, but not predictive or quantitative, says Stone. We went back to the basics and we think we have now solved that problem.

A Perspective review of the theory in the same issue of Science noted, By developing a new theory in which the main properties of a laser can be physically understood . . . they have provided a substantially broader perspective of laser physics that unifies the physical description of many possible laser structures.

Ultimately, we hope that our code can be used as a design tool for new classes of micro- and nano-lasers with important applications says Stone, who also believes that eventually their theory will become part of the answer to the question: How does a laser work"


'/>"/>

Contact: Janet Rettig Emanuel
janet.emanuel@yale.edu
203-432-2157
Yale University
Source:Eurekalert  

Related biology technology :

1. Nikon Instruments New NIS-Elements C Delivers Comprehensive Confocal and Widefield Imaging Capabilities in Single Unifying Software Platform
2. Physicists saved from drowning in complexities of wetting theory
3. Fluid theory confirmed by Foton
4. Alma Lasers Ranked 9th in Deloitte Technology Fast 50 Award
5. Laser Energetics to Integrate BrightStar(TM) Alexandrite Lasers in Medical and Dental Applications
6. Advanced Life Sciences Selected as Founding Member of the New NASDAQ OMX AeA Illinois Tech Index
7. Advanced Analytical Unveils New Instrument for Rapid Microbial Identification at BIO 2008
8. Advanced BioHealing and Regenesis Biomedical Form Co-Promotion Alliance for Dermagraft(R)
9. Boston Scientific Announces European Approval and Market Launch of New Family of Advanced Pacemakers
10. Advanced Life Sciences Announces First Quarter 2008 Financial Results
11. Advanced Life Sciences to Host 2008 First Quarter Financial Results Conference Call and Webcast
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
New unifying theory of lasers advanced by physicists
(Date:4/26/2017)... ... April 25, 2017 , ... LABS, Inc. (LABS) announced in December 2016 ... extensive test menu: Nucleic Acid Testing (NAT) for ZIKV; and Enzyme Immunoassays (EIAs) specific ... offer NAT screening for blood donors under an Investigational New Drug (IND) study protocol. ...
(Date:4/26/2017)... Pa. , April 26, 2017  Genisphere ... delivery platform, has signed a collaborative and sponsored ... Dr. Silvia Muro . The overall goal ... and pharmacodynamics of various 3DNA designs and formulations ... involve targeting diseases of the vasculature as well ...
(Date:4/25/2017)... Providence -based biotechnology ... technology to an undisclosed global pharmaceutical company, for ... Tregitopes, pronounced T·rej·itopes, are a set of peptides ... Annie De Groot and EpiVax CIO ... autoimmune disease therapy, Tregitopes are capable of engaging regulatory ...
(Date:4/24/2017)... ... April 24, 2017 , ... ... denaturation in a cellular milieu; however, the broad application of this cellular target ... platforms with sensitive quantitative readouts. Cell-based thermal stabilization assays are valuable methods for ...
Breaking Biology Technology:
(Date:3/23/2017)... DUBLIN , Mar. 23, 2017 Research ... Anti-Theft System Market Analysis & Trends - Industry Forecast to 2025" ... ... to grow at a CAGR of around 8.8% over the next ... This industry report analyzes the market estimates and forecasts for all ...
(Date:3/20/2017)... At this year,s CeBIT Chancellor Dr. Angela Merkel visited ... to the DERMALOG stand together with the Japanese Prime Minster Shinzo Abe. ... the largest German biometrics company the two government leaders could see the ... well as DERMALOG´s multi-biometrics system.   Continue Reading ... ...
(Date:3/9/2017)... Australia , March 9, 2017 /PRNewswire/ ... at the prestigious World Lung Imaging Workshop at the ... Fouras , was invited to deliver the latest data ... This globally recognised event brings together leaders at the ... latest developments in lung imaging. "The ...
Breaking Biology News(10 mins):