Navigation Links
Scientists demonstrate laser with controlled polarization

Cambridge, Mass. April 13, 2009 Applied scientists at the Harvard School of Engineering and Applied Sciences (SEAS) in collaboration with researchers from Hamamatsu Photonics in Hamamatsu City, Japan, have demonstrated, for the first time, lasers in which the direction of oscillation of the emitted radiation, known as polarization, can be designed and controlled at will. The innovation opens the door to a wide range of applications in photonics and communications. Harvard University has filed a broad patent on the invention.

Spearheaded by graduate student Nanfang Yu and Federico Capasso, Robert L. Wallace Professor of Applied Physics and Vinton Hayes Senior Research Fellow in Electrical Engineering, both of SEAS, and by a team at Hamamatsu Photonics headed by Dr. Hirofumi Kan, General Manager of the Laser Group, the findings will be published as a cover feature of the April 13 issue of Applied Physics Letters.

"Polarization is one of the key features defining a laser beam. Controlling it represents an important new step towards beam engineering of lasers with unprecedented flexibility, tailored for specific applications," explains Capasso. "The novelty of our approach is that instead of being conducted externally, which requires bulky and expensive optical components, manipulation of the beam polarization is achieved by directly integrating the polarizer on the laser facet. This compact solution is applicable to semiconductor lasers and other solid-state lasers, all the way from communication wavelengths to the mid-infrared and Terahertz spectrum".

Light sources with a desirable polarization state are useful for a wide variety of applications. For example, satellite communications use two orthogonal polarizations to double the capacity of the channel; circularly-polarized light sources are necessary to detect certain biomolecules; and laser sources with a variety of polarization states have relevance for quantum cryptography.

To achieve the results, the researchers sculpted a metallic structure, dubbed a plasmonic polarizer directly on the facet of a quantum cascade (QC) laser. The QC laser emitted at a wavelength of ten microns (in the invisible part of the spectrum known as the mid-infrared where the atmosphere is transparent). The team was able to control the state of polarization by generating both linearly polarized light along an arbitrary direction and circularly polarized light.


Contact: Michael Patrick Rutter
Harvard University

Related biology technology :

1. Gladstone scientists uncover potential mechanism of memory loss in Alzheimers disease
2. Three Studies by Independent Scientists Highlighting Pressure Cycling Technology (PCT) to be Presented this Week at the British Mass Spectrometry Societys 29th Annual Meeting
3. Social Network for Scientists Marks Ten Years Online
4. Scientists synthesize memory in yeast cells
5. Scientists synthesize memory in yeast cells
6. University of Leicester scientists discover technique to help friendly bacteria
7. Scientists discover how cancer may take hold
8. Yale scientists make 2 giant steps in advancement of quantum computing
9. New Scientists Boost Disease-based Research at Boston Biomedical Research Institute
10. Scientists say sabercat bit like a pussycat
11. New Corporate Website Launched - Focus on Life Scientists, Flow Cytometrists, & Clinicians
Post Your Comments:
Related Image:
Scientists demonstrate laser with controlled polarization
(Date:6/27/2016)... , June 27, 2016  Global demand for ... percent through 2020 to $7.2 billion.  This market ... beverages, cleaning products, biofuel production, animal feed, and ... diagnostics, and biocatalysts). Food and beverages will remain ... by increasing consumption of products containing enzymes in ...
(Date:6/27/2016)... Diego, CA (PRWEB) , ... June 27, 2016 , ... ... solutions for clinical trials, announced today the Clinical Reach Virtual Patient Encounter ... their care circle with the physician and clinical trial team. , Using the CONSULT ...
(Date:6/27/2016)... , June 27, 2016   Ginkgo Bioworks , ... industrial engineering, was today awarded as one of ... of the world,s most innovative companies. Ginkgo Bioworks ... for the real world in the nutrition, health ... work directly with customers including Fortune 500 companies ...
(Date:6/24/2016)... ... 2016 , ... Researchers at the Universita Politecnica delle Marche in Ancona combed ... pleural mesothelioma. Their findings are the subject of a new article on the Surviving ... signposts in the blood, lung fluid or tissue of mesothelioma patients that can help ...
Breaking Biology Technology:
(Date:5/3/2016)... , May 3, 2016  Neurotechnology, a provider ... MegaMatcher Automated Biometric Identification System (ABIS) , ... multi-biometric projects. MegaMatcher ABIS can process multiple complex ... any combination of fingerprint, face or iris biometrics. ... SDK and MegaMatcher Accelerator , which ...
(Date:4/26/2016)... and LONDON , April 26, ... of EdgeVerve Systems, a product subsidiary of Infosys ... announced a partnership to integrate the Onegini mobile ...      (Logo: ) ... customers enhanced security to access and transact across ...
(Date:4/15/2016)... 2016  A new partnership announced today will ... decisions in a fraction of the time it ... high-value life insurance policies to consumers without requiring ... Force Diagnostics, rapid testing (A1C, Cotinine and HIV) ... pressure, weight, pulse, BMI, and activity data) available ...
Breaking Biology News(10 mins):