Laser

Laser (63)
Laser beam (7)
Laser characteristics (6)
Laser components (5)
Laser devices (7)
Laser technologies (3)
Laser types (5)

Synopsis: Photonics & laser: Photonics & laser generale: Laser:

The device uses a thumbnail-sized quantum cascade laser (QCL) as well as tuning forks that cost no more than a dime to detect very small amounts of nitrous oxide and methane.

That allows for far better detection of gases than more common lasers that operate in the near-infrared.

and is far better able to detect trace amounts of gas than lasers used in the past.

The laser beam is focused between the two prongs of the quartz tuning fork. When light at a specific wavelength is absorbed by the gas of interest

Using a standard laser printer stocked with special wax-based inks he printed patterns of small dots onto uncoated filter paper.

The device uses a thumbnail-sized quantum cascade laser (QCL) as well as tuning forks that cost no more than a dime to detect very small amounts of nitrous oxide and methane.

That allows for far better detection of gases than more common lasers that operate in the near-infrared.

and is far better able to detect trace amounts of gas than lasers used in the past.

The laser beam is focused between the two prongs of the quartz tuning fork. When light at a specific wavelength is absorbed by the gas of interest

and docks with the teats using a 3d camera and lasers. Another feature is a set of counter-rotating brushes that automatically clean the teats of dirt

#New 3d printed materials lighter than water and as strong as steel A Nanoscribe 3d printer can print models of the Empire state building in a space the width of a human hair using precision lasers.

The printer s mirror-focused laser shines on and hardens a droplet of liquid plastic on a slide.

A computer moves the plate under the laser, selectively hardening it, layer by layer, to match a digital 3d model.

They also are exploring using lasers to precisely shrink the plastic in specific patterns. Nam first had the idea for using Shrinky Dinks plastic to assemble nanomaterials after seeing a microfluidics device that used channels made of shrinking plastic.

This research outcome potentially allows for great flexibility in the design and optimization of electronic and optoelectronic devices like solar panels and telecommunication lasers.

Semiconductor lasers typically emit into elliptical beams that are really hard to work with and the new metasurface optical components could replace expensive optical systems used to circularize the beams.

This research outcome potentially allows for great flexibility in the design and optimization of electronic and optoelectronic devices like solar panels and telecommunication lasers.

the UVM team--with support from the National Science Foundation--built a scanning laser microscope,

and whispering galleries are found in applications ranging from sensing, spectroscopy and communications to the generation of laser frequency combs.

This research outcome potentially allows for great flexibility in the design and optimization of electronic and optoelectronic devices like solar panels and telecommunication lasers.

This research outcome potentially allows for great flexibility in the design and optimization of electronic and optoelectronic devices like solar panels and telecommunication lasers.

and have applications in superresolution microscopy, laser cutting, and particle acceleration.""You generally would need a large optical setup,

#Mini X-ray source driven by laser light alone The physicists have built a miniature X-ray source. In so doing, the researchers from the Laboratory of Attosecond Physics of the Max Planck Institute of Quantum Optics

and the Technische Universität München (TUM) have captured three-dimensional images of ultrafine structures in the body of a living organism for the first time with the help of laser-generated X-rays.

By contrast, the laser-driven system in combination with phase-contrast X-ray tomography only requires a university laboratory to view soft tissues.

The paper states,-rays radiated by relativistic electrons driven by well-controlled high-power lasers offer a promising route to a proliferation of this powerful imaging technology.

A laser-driven plasma wave accelerates and wiggles electrons, giving rise to a brilliant kev X-ray emission. his so-called betatron radiation is emitted in a collimated beam with excellent spatial coherence and remarkable spectral stability.

Our results suggest that laser-based X-ray technology offers the potential for filling the large performance gap between synchrotron

For the first time, scientists coupled their technique for generating X-rays from laser pulses with phase-contrast X-ray tomography to visualize tissues in organisms.

The X-rays required were generated by electrons that were accelerated to nearly the speed of light over a distance of approximately one centimeter by laser pulses lasting around 25fs.

The laser pulses have a power of approximately 80tw. By way of comparison: an atomic power plant generates 1, 500mw.

First, the laser pulse ploughs through a plasma consisting of positively charged atomic cores and their electrons like a ship through water, producing a wake of oscillating electrons.

For the first time, the researchers combined their laser-driven X-rays with a phase-contrast imaging method developed by a team headed by Prof.

This laser-based imaging technique enables creation of three-dimensional images of objects. After each X-ray pulse, meaning after each frame,

Semiconductor lasers typically emit into elliptical beams that are really hard to work with and the new metasurface optical components could replace expensive optical systems used to circularize the beams.

The ability to mold inorganic nanoparticles out of materials such as gold and silver in precisely designed 3d shapes is a significant breakthrough that has the potential to advance laser technology microscopy solar cells electronics environmental testing disease

#Laser scientists create portable sensor for nitrous oxide, methane Rice university scientists have created a highly sensitive portable sensor to test the air for the most damaging greenhouse gases.

and laser pioneer Frank Tittel and his group uses a thumbnail-sized quantum cascade laser (QCL) as well as tuning forks that cost no more than a dime to detect very small amounts of nitrous oxide and methane.

That allows for far better detection of gases than more common lasers that operate in the near-infrared.

and is far better able to detect trace amounts of gas than lasers used in the past.

"The laser beam is focused between the two prongs of the quartz tuning fork. When light at a specific wavelength is absorbed by the gas of interest,

Co-authors include Rice graduate student Wenzhe Jiang and former Rice Laser Science Group members Przemystaw Stefanski, Rafat Lewicki, Jiawei Zhang and Jan Tarka.

Mass-Selected Photoelectron Circular Dichroism (MS-PECD) uses circularly polarised light produced by a laser to ionise the molecules using a couple of photons to knock an electron out of the chiral molecule to leave a positively charged ion behind.

either forwards or backwards along the laser beam it is possible to distinguish between left and right handed molecules with an accuracy of up to several tens of per cent rather than a fraction of a per cent.

Instead of using lasers or cameras and algorithms or satellite GPS, this is guided by a cable that emits a electromagnetic signal.

mount and laser diode in a 3d-printed case, can image and size DNA molecules 50,000 times thinner than a human hair.

The research, ield-Portable Smartphone Microscopy Platform for Wide-field Imaging and Sizing of Single DNA Molecules, was presented at the Optical Society Conference on Laser and Electro optics (CLEO) 2015 h

In my own work as a chemistry researcher, my group invented a laser the size of a virus particle,

These tiny lasers are promising light sources that can be used to send and receive data with high bandwidths as well as to detect trace molecules or bio-agents.

2015news and information Nanometric sensor designed to detect herbicides can help diagnose multiple sclerosis June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:

2015discoveries Nanometric sensor designed to detect herbicides can help diagnose multiple sclerosis June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:

2015announcements Nanometric sensor designed to detect herbicides can help diagnose multiple sclerosis June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:

2015imaging Robust new process forms 3-D shapes from flat sheets of graphene June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:

2015robust new process forms 3-D shapes from flat sheets of graphene June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:

4-D printing to advance chemistry, materials sciences and defense capabilities June 18th, 2015discoveries Nanometric sensor designed to detect herbicides can help diagnose multiple sclerosis June 23rd, 2015sweeping lasers snap together

#Living lasers made by injecting oil droplets into human cells Light fantastic (Image: Matja Humar and Seok Hyun Yun) Individual cells have been turned into tiny lasers. t actually super-easy,

says Matja Humar of Harvard Medical school. The feat allows cells to be labelled and monitored more accurately,

forming an optical cavity which could be filled with fluorescent dye. Shining a light pulse on to the cavity excited the dye atoms into emitting light in a tightly focused beam.

they performed the same function as the oil droplets, emitting laser light when excited. The final way involved exploiting the fatty droplets that exist naturally within living cells. e all have these fat cells inside our tissue.

We are made all of lasers, says Humar. The first two approaches were tested on human cells, the last on pig cells.

However laser light is characterised by having an extremely narrow range of wavelengths. That means it is theoretically possible,

to give every single cell in the human body a unique, identifiable laser signature, Humar says.

which focuses exclusively on the macrophage route to converting cells into lasers, goes further in laying out its potential applications.

Funded through a National Science Foundation Major Research Instrumentation grant, the new highly sensitive, laser-based instrument provides scientists with a method to more accurately measure global human exposure to mercury.

The measurement approach is called sequential two-photon laser induced fluorescence (2p-LIF) and uses two different laser beams to excite mercury atoms

and monitor blue shifted atomic fluorescence. UM Rosenstiel School Professor of Atmospheric Sciences Anthony Hynes and colleagues tested the new mobile instrument

titled"Deployment of a sequential two-photon laser-induced fluorescence sensor for the detection of gaseous elemental mercury at ambient levels:

International team of scientists constructs first germanium-tin semiconductor laser for silicon chips The transfer of data between multiple cores as well as between logic elements and memory cells is regarded as a bottleneck in the fast-developing computer technology.

However in spite of intensive research a laser source that is compatible with the manufacturing of chips is not yet achievable according to the head of Semiconductor Nanoelectronics (PGI-9). The basis of chip manufacturing is silicon an element of main group IV of the periodic table.

Typical semiconductor lasers for telecommunication systems made of gallium arsenide for example however are costly and consist of elements from main groups III

Such laser components cannot therefore be applied directly onto silicon. They have to be produced externally at great effort

and thus make it a usable laser source. The scientists at Julich's Peter Grunberg Institute have succeeded now for the first time in creating a real direct main group IV semiconductor laser by combining germanium and tin

which is classed also in main group IV. The high tin content is decisive for the optical properties.

The functioning of the laser is limited so far to low temperatures of up to minus 183 degrees Celsius however.

Siegfried Mantl's group at PGI-9 Stephan Wirths applied the laser directly onto a silicon wafer

Phd student Richard Geiger fabricated the laser structures there. That way we were able to demonstrate that the germanium-tin compound can amplify optical signals as well as generate laser light reports Dr. Hans Sigg from the Laboratory for Micro and Nanotechnology.

The laser was excited optically for the demonstration. Currently the scientists in Dr. Dan Buca's group at Julich are working on linking optics and electronics even more closely.

The next big step forward will be generating laser light with electricity instead and without the need for cooling if possible.

The aim is to create an electrically pumped laser that functions at room temperature. The laser beam is not visible to the naked eye.

Gesn absorbs and emits light in a wavelength range of about 3 micrometres. Many carbon compounds such as greenhouse gases

or biomolecules also display strong absorption lines at this boundary between near and mid-wavelength infrared.

as well as miniature NS honeycomb cells, from nylon using selective laser sintering for experimentation. NS honeycombs can be made from a variety of materials to suit distinct applications.

Arrayat the fair, the FBH exhibits novel dual-wavelength diode lasers that are suitable for use in miniaturized, portable laser measurement systems for Raman spectroscopy applications.

The laser sources alternatingly emit light from only one chip at two different stabilized wavelengths, which are defined by gratings implemented into the semiconductor chip.

Wavelength selection is realized by separately addressable sections within the laser. The innovative diode laser chip is ideally applicable for SERDS (Shifted Excitation Raman Difference Spectroscopy),

enabling to measure Raman spectra under real-world conditions even in highly fluorescent environments and when exposed to daylight.

With these FBH tiny monolithic light sources on chip level, a compact SERDS measurement head that is only as small as a laser pointer was realized for the first time.

Arrayfiber-coupled demonstrators newly developed at FBH for industrial use aim at integrating laser radiation with high spectral brightness into various systems

Now, efficient and compact laser sources are at hand emitting in the near-infrared on multi-watt level (CW operation) with a narrow-band spectrum and a stigmatic, nearly Gaussian laser beam

Such sources are demanded highly for the pumping of solid-state lasers and frequency doubling. On a footprint of less than 10 cm2, the micro module integrates a 1064 nm distributed Bragg reflector (DBR) tapered laser,

a micro-optical assembly designed to maintain brightness and mounted with sub-micrometer precision and temperature-stabilizing components.

Arraythe institute develops highly brilliant diode lasers in a great variety of designs and packages, covering the wavelength range from 630 nm to 1180 nm.

For rapid prototyping applications the FBH has developed DBR ridge waveguide (RW) lasers with 24 individually addressable emitters featuring a wavelength spacing>0. 3 nm and a spectral width<1 pm.

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