high stakes USA online casinos play online blackjack machine slot games for mac computers best rated online casino casino deposit options casino online with EcoCard complete information online casinos taking usa players rtg best casino for USA players

May 09

Wavelength Modulation Spectrum using tunable 2.0 micron VCSEL; From JTh1L.6, A. Kahn et al,. "Open-Path Green House Gas Sensor for UAV Applications"

This post originally appeared on Jim’s Cleo Blog and is reproduced with permission of the author.

Today at CLEO I spent a large amount of time at the expo hunting down which companies were selling 2.0 micron wavelength products and why. In the technical program, there are a large number of contributed talks regarding 2.0 micron lasers, pulsed and continuous wave. On Monday I attended session CM1B, Ultrafast Mid-IR in which 5 out of 8 papers demonstrated ultrafast pulses about 2.0 microns. Today there was a session titled CTu2D, 1.5 to 5 micron Lasers which also had 5 talks out of 8 showing laser systems operating near 2.0 microns.

There have been and will be a handful of talks not pinned down to these topic categories as well:

-CM2B.2, “A Broadband 1850-nm 40-Gb/s Receiver Based on Four-Wave Mixing in Silicon Waveguides”

-CTu3M.7, “All-fiber 10-GHz Picosecond Pulse Generation at 1.9 microns without Mode-locking”

-JTh1L.6, “Open-Path Green House Gas Sensor for UAV Applications”

-CF1K.1, “Single-Frequency kHz-Linewidth 2-μm GaSb-Based Semiconductor Disk Lasers With Multiple-Watt Output Power”

-CF1N.4, “Double-wall carbon nanotube Q-switched and Mode-locked Two-micron Fiber Lasers”

However, what we like to research and what we can actually bring to market are often two very different things. I am therefore excited that it is not just 2.0 micron papers that are cropping up at this year’s conference, but 2.0 micron products at the expo as well.

So why is anyone interested in light in the 2.0 micron region? My personal interest stems from a research talk I saw by analytical chemist, Mark Arnold, at University of Iowa. Arnold is trying to perform some hard analytical  chemistry on 2.0 micron light shone through the skin on the back of one’s hand. He hopes that by looking at the absorption spectra, he can measure blood glucose levels without having to draw blood. This noninvasive testing would be a boon to diabetics who are not thrilled about pricking their fingers regularly. Wavelengths that are helpful for pinning down glucose, but that are not absorbed as readily by tissue are 2.13 microns, 2.27 microns, and 2.33 microns.In short, there are some interesting molecules around 2.0 microns on which to perform spectroscopy. For environmental sensing, there is 1877 nm, a well defined water absorption line, and 2004 nm, a good line for carbon dioxide detection, and many more.

Many of the companies I spoke with selling 2.0 micron components and sources confirmed such spectroscopic applications of their customers:

-Oz Optics now sells passive fiber components at 2.0 microns as well as DFB sources.

-Sacher Lasertchnik and Nanoplus make DFB lasers extending through the 2.0 micron region depending on your molecule of interest.

-Advalue Photonics makes thulium-based fiber laser systems and sells passive 2.0 micron products.

-New Focus will be developing tunable laser diodes about 2.0 microns in the next few months.

-Nufern and CorActive are selling Tm- and Ho-doped fiber for 2.0 micron amplification and for fiber sources.

-IPG sells a number of lasers from 2.0-2.8 microns based Cr:ZnSe as well as 2.0 micron fiber lasers using thulium doped fibers.

There are other advantages to 2.0 micron light as well… (for a list of more companies and the rest of the post, click here)

Apr 27

Prototype of a photonic spark plug using Q-switched Nd:YAG/Cr4+:YAG microlasers (top), and a standard automobile spark plug (bottom). Photo from Takunori Taira, National Institutes of Natural Sciences, Japan

This post originally appeared on Jim’s Cleo Blog and is reproduced with permission from its author.

An April 20, CLEO press release recently caught the eye of the BBC News, and with good reason. A Japanes and Romanian collaboration will show data at CLEO from a 10 mm, multi-beam, ceramic laser whose beams can reach energies greater than 10 millijoules over a 800 picosecond pulse width, to ignite fuel for internal combustion.

The research behind the photonic spark plug will be presented in, CMP1 “Composite All-Ceramics, Passively Q-switched Nd:YAG/Cr4+:YAG Monolithic Micro-Laser with Two-Beam Output for Multi-Point Ignition” on May 2, at 1:30 pm, by Takunuroi Taira and Matsaki Tsunekane from the Laser Research Center in Okazaki, Japan, in collaboration with Kenji Kanehara from Nippon Soken, Inc. in Japan, andNicolaie Pavel of Romania’s National Institute for Laser, Plasma and Radiation Physics in Romania.

There are a handful of advantages to using photonic spark plugs over conventional spark plugs. A photonic spark plug could potentially ignite leaner fuel mixtures (more air and less fuel) to reduce emissions of polluting nitrogen oxides (NOx). Conventional spark plugs cannot practically accomplish this right now because the increased spark-voltage required to ignite lean mixtures erodes the electrodes too quickly-they need to be replaced too frequently which is expensive.

Additionally, a photonic spark plug could improve combustion efficiency for better driving performance and/or fuel economy. A conventional spark plug sits on top of the head of a cylinder and ignites the fuel mixture near the top where there is a large thermal mass of cold metal from the cylinder. Taira’s photonic spark plug can focus the beams into the center of the gas mixture for three times faster, and a more symmetric, expansion of the flame. Also, the ignition time-scale using the pulsed micro-laser beams is nanoseconds compared to milliseconds for a conventional spark plug. The ability to better control ignition timing over an automobile’s cylinders will result in more power delivered to the drive-train when desired.

The Japanese and Romanian collaboration is already working with DENSO Corporation, an affiliate of Toyota. Keep your eyes out for photonic, fiber-patch cord jumper cables in the near future! …For the original post, click here

Mar 04

From LLNL, Artist's concept of the MEGa-ray system

This post originally appeared on Jim’s Cleo Blog and is reproduced with permission from its author.

The conference program for CLEO 2011 was just released on Wednesday, March 2. Among many other cutting-edge and ground-breaking contributed papers are those from the new conference to debut this May, CLEO: Applications and Technology. Browsing the topic subcategory, Lasers for Government Science and Security Applications, I came across titles that seemed to be the stuff out of a James Bond movie, ATuF2, “Mono-Energetic Gamma-rays (MEGa-rays) and the Dawn of Nuclear Photonics” and ATuF4, “2D+3D Face Imaging for Stand-off Biometric Identification.” Can’t you just picture the mad, evil-scientist-villain (disfigured in some way, stroking his cat) plotting to steal a MEGa-Ray device in one scene, and Q 3D-scanning 007′s face in order for him to gain access into MI6 in another? Maybe I need to do more optics research and watch less movies, however, there’s no question about impact of these papers.

Last February, David Gibson, Christopher Barty and colleagues at the National Ignition Facility and Photon Science Division at Lawrence Livermore National Laboratory (LLNL) published their initial results on a MEGa-Ray source they constructed as groundwork for a beefier machine (2 MeV) in the future. At 2 MeV, such a narrow-bandwidth, high-energy, x-ray source could provide brightness 15 orders of magnitude greater than those produced by synchotrons. The artist rendition of the facility shown in the figure above demonstrates the compact size (a large room) compared to the kilometer-scale rings or linacs conventionally used for generating x-ray beams. Additionally, x-rays of this energy and brightness will find use in nuclear physics and applications such as detection of concealed nuclear material or specific isotope detection and quantification.

Brian Redman from Lockheed Martin and his collaborators, on the other hand, are using light in a very different way- to scan human faces for secure identification and threat-detection. Biometric identification refers to a technique in which a subject can be identified by a unique physical trait or something they physically produce. Some examples are fingerprinting, iris scans, facial scans, and analysis of gait.

One of Lockheed’s specific objectives in their partnership with the FBI is to build a database of facial scans analogous to their database of fingerprints, the Integrated Automated Fingerprint Identification System (IAFIS). I look forward to hearing how Dr. Redman’s CLEO talk addresses the optics involved in the facial scans, the use of both 2D and 3D scan information, and the success of the algorithms employed..for the full post click here.

preload preload preload