Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A laser for your eyes

18.04.2016

The Lomonosov Moscow State University scientists developed a growth technology of single crystals for creating a unique eye-safe laser

A team of the Lomonosov Moscow State University scientists and the Belarusian National Technical University has created a unique laser, which is a compact light source with wavelengths harmless to the human eye. The development can be used in medicine, communications systems and also in research. The works are published in Journal of Crystal Growth and Optics Letters.


As-grown (Er,Yb):GdAl3(BO3)4 crystal by using high-temperature solution growth on dipped seeds (a) .

Source: Nikolay Leonyuk

'In collaboration with our colleagues of the Center for Optical Materials and Technologies, Belarusian National Technical University, we have developed a highly efficientdiode-pumped eye-safe laser, which can be used in ophthalmology, communication systems and ranging', says Nikolay Leonyuk, Professor, Department of Crystallography and Crystal Chemistry, Geological Faculty, the Lomonosov Moscow State University. The development of such laser became possible to the fact that the team of scientists had created a laboratory growth technology of single crystals with desired properties.

The emission with wavelengths of 1500 -- 1600 nm is agreeably safe for the eyes and seems prospective for practical applications in medicine, ranging (determining the distance from the observer to the object), communication systems andoptical location.

This feature is explained with, first, the fact that the light-refracting system of the eye (cornea and crystalline lens) have a sufficiently high absorption coefficient in this part of the spectrum, so only a small fraction of the energy reaches the sensitive retina. Second, the radiation in the 1500 -- 1600 nm spectral range suffers low losses passing through the atmosphere, and it makes advantages for their applications in telecoms.

To date, among the sources of radiation in this spectral range, the most widely used are the solid-state lasers based on phosphate glasses co-doped with Er (erbium), and Yb (ytterbium) ions. Such lasers are also relatively simple, compact and capable of operating in adjusted Q-mode required for producing short impulses. In the meantime, the main disadvantage restricting the usage of erbium phosphate glasses in continuous diodesystems is a low thermal conductivity of the matrix. To avoid such limitation, Er and Yb containing crystalline matrixcan be used.

In the issued research, GdAl3 (BO3)4 single crystals co-doped with Er and Yb were used to improve the efficiency of generation pulse energy and repetition rate, and henceto increase the maximal measurement range, reducing errors and time spending. These single crystalsare characterized by a record value of thermal conductivity and high thermochemical stability (decomposition at temperatures of 1280°C, resistant to corrosive environments) as well as mechanical strength.

'The created solid-state laser based on yttrium gadolinium borate crystals (Er,Yb:GdAl3 (BO3)4 is a unique compact source of emission with varying eye-safe wavelengths' says Nikolay Leonyuk. 'Reliable laser design, along with high performance makes it possible to be widely used in laser ranging systems, metrology andlaser-induced breakdown spectroscopy.'

Using of laser diode as a pump source increase the lifetime of laser up to 100 000 hours. The laser system is easy to use and plug and play, it does not require water cooling, as well as does not generate any vibration during laseroperations.

Compared with the widely used CW erbium fiber lasers, the (Er,Yb):GdAl3 (BO3)4-based laser is characterized by linear laser radiation and lower price.

Media Contact

Vladimir Koryagin
science-release@rector.msu.ru

http://www.msu.ru 

Vladimir Koryagin | EurekAlert!

More articles from Medical Engineering:

nachricht Visualizing gene expression with MRI
23.12.2016 | California Institute of Technology

nachricht Illuminating cancer: Researchers invent a pH threshold sensor to improve cancer surgery
21.12.2016 | UT Southwestern Medical Center

All articles from Medical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

An innovative high-performance material: biofibers made from green lacewing silk

20.01.2017 | Materials Sciences

Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery

20.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>