Green Laser Pointer with Star Cap constellations beam

http://laserpointers.auctionblah.com/green-laser-pointer-with-star-cap-constellations-beam-72/

Stable 405-, 35-mW Blue-Violet Laser Diode

Products, a UK optoelectronics device manufacturer and laser diode specialist, has introduced a lead-free, blue-violet wavelength (405 nm) laser diode from Sanyo. The Sanyo DL-5146-152 405-nm, 35-mW CW (50-mW pulsed) laser diode incorporates an internal monitor photodiode that can be used to accurately stabilize and control optical output power. Ideal for applications such as biomedical instrumentation, medical imaging, fluorescence sensing, spectroscopy and microscopy, the DL-5146-152 was also developed for use in DVD and other emerging technologies. Supplied in a 5.6-mm package with M-type common cathode pin configuration, the Sanyo DL-5146-152 laser diode has a low threshold current of 38 mA, typical operating current of 75 mA, operating voltage of 5.6 V (higher than conventional lasers), threshold voltage of 4.8 V, monitoring output current of 0.2 mA, laser reverse voltage of 2 V and differential efficiency of 0.9 mW/mA at a visible wavelength of 405 nm. The operating temperature range is 0 to 60 degrees C. Virtually all Sanyo laser diodes are now RoHS compliant.

http://www.photonics.com/Content/ReadArticle.aspx?ArticleID=24500

New Type Of Laser Discovered

A Princeton-led team of researchers has discovered an entirely new mechanism for making common electronic materials emit laser beams. The finding could lead to lasers that operate more efficiently and at higher temperatures than existing devices, and find applications in environmental monitoring and medical diagnostics.

The team that conducted the study includes Gmachl's graduate student Kale Franz, who built the laser that revealed the new phenomenon, and Stefan Menzel, a graduate student from the University of Sheffield, UK, who unearthed the unique properties of the phenomenon during an internship at Princeton University last summer.
The study was published online in Nature Photonics on Dec. 14.
The light emitted by a laser differs fundamentally from light produced by common sources such as the sun, fire, or electric lamps. According to the field of physics called quantum electrodynamics, light is made up of particles called photons. Common sources of light emit photons that are in a random order, like crowds milling about a busy marketplace. In contrast, photons in a laser are "in sync" with each other, like a music band marching in formation. This property, called coherence, allows laser light to shine in an intense, narrow beam of a single, very pure color.
One way to produce a laser beam is to pass an electric current through a semiconductor such as gallium arsenide. The electric current pumps energy into the material, forcing a large number of its electrons to a higher energy level than normal. Under certain conditions, these electrons drop to a lower level of energy, and emit the extra energy in the form of synchronized photons of light. This is the mechanism underlying lasers used in CD writers, laser pointers and other common electronic devices.

http://www.sciencedaily.com/releases/2008/12/081222122609.htm

Laser Pointers As Protestor's Tool

Protestors used laser pointers to try to blind police as unrest continued in Greece over the fatal police shooting of a teenager. via: Metro

I have heard of a lot of stories on misuse of laser pointers by pointing to aircrafts and sportmen etc. But using of laser pointers in a riot is the first time. It is really like a weapon in small scale war.

http://yan.me/2008/12/laser-pointers-protestors-tool

High power laser diode DRIVER for DPSS lasers

The Laser Diode Driver is an electronic device that combines high power current source (up to 10A) for laser diode (LD) and two controllers for Peltier termoelectrical coolers (TECs).

Compact and highly-efficient design limits power dissipation and simplifies heat-sinking requirements. Perfectly suited for OEM applications.
The Laser Diode Driver incorporates LD protection features like slow current ramp-up (soft start function), current limit, temperature limit and overheating protection.

Features
-Easy controlled
-Soft start function
-Laser diode current up to 10A
-User selectable: 2 uni-directional TEC controllers or single bi-directional TEC controller
-For smooth temperature stabilization - adjustable parameters to avoid temperature oscillations
-Overheating protection for laser diode
-Compact size: 119mm(with DB15 socket 128mm) x 51mm x 20mm.
-LD current modulation (optional)
-Microprocessor controlled
-USB 2.0 compatible

http://optics.org/cws/product/P000001876

Green Laser Pointers - Which One Should I Choose?

Just by typing in the word "laser pointer" into google's search engine, you will find hundreds of laser pointer companies out there. Some have very attractive websites with very high prices. Some laser pointers offer the same functions and power but are much cheaper. It's all very confusing especially when you don't understand what all the terms mean. You're about to spend a good amount of money on a laser pointer, the least you should is do some research before choosing the right laser and right company for your needs.


The first thing you will notice about high powered green laser pointers is they are always categorized by power. This is the number with "mW" at the end. mW stands for milli-watts and is 1/1000 of a watt, that is, 1000mW is 1W. You will also see another number associated with green laser pointers. This number has "nm" at the end. This stands for nano-meters and is used to measure wavelength. You really don't have to look into this number too much as all green laser pointers have a wavelength of 532nm. Pretty much, when you see 532nm, you should automatically think of the color green.


Now, lets focus on power. This is probably the most important factor because the more power you buy, the more money you spend. Yes, power is expensive! You need to ask yourself, what are you buying this laser pointer for? I think I can categories this into 3 types of lasers.


The first type, you're looking to buy something for everyday use. You're a teacher, professor, or someone always doing presentations in large groups. You are looking to use the green laser pointer as a "pointer". Good, I can make the decision for you now. Get a 5mw green laser pointer. While you could buy something more powerful, I wouldn't suggest getting anything over 20mW if pointing is all you will be doing. 5mW is for small classroom pointing, 20mw is for longer distance pointing as in an auditorium. Now, I'm talking about real laser pointers, that is, don't buy from ebay or any auction sites. Their advertised output is usually fake. If you buy a 5mW, you'll probably end up with a 1-2mW green laser. You can search the term "Skylasers" in google, they are a good reputable company.


Now, the second type is looking for a visible beam green laser pointer. First question, are you looking to burn or melt anything with it? If you answer is no, stick with a green laser pointer between 20mW to 80mW. During the day, these lasers have a very bright end dot (the laser beam is not visible). Realize that you will not find a laser pointer with a visible beam during the day. At night, however, a 20-80mw green laser is very bright! Yes, amazingly bright! This is where I ask, how much do you plan on spending? The more power you buy, the brighter the laser pointer. On a personal note, I would recommend a 40 - 60mW green laser pointer if all you want is a bright beam. The 20mW is still slightly dim for me. 40mW to 60mW green laser pointers go for around $100-$150. If you have the money, go for the 80mW, you will notice the difference in brightness. I just think 40mW - 60mW is plenty bright though.


If you are looking to burn and melt with this laser, you need something above 100mW. Want to see laser pointers in action? Simple, go to youtube and search for "lasers". You will find green laser pointers from various companies lighting cigarettes, popping balloons, etc. There are some very cool videos out there. The question now is, what do you want to burn? Again, the more power you have, the faster your laser will burn and melt. You can buy green laser pointers with more then 500mw these days that could cost you a pretty penny. It's really up to you as to how much you want to spend. If burning is your thing, look around for reliable companies and compare prices. Buy something you are comfortable with spending.


There are several laser pointer forums out there that can be very resourceful to you. Stick with www.laserpointerforums.com, www.photonlexicon, and www.candlepoweredforums.com. These forums have a good following and members are generally very eager to answer your questions. I suggest staying away from www.lasercommunity.com, this forum is very tightly monitored and is run by a laser company. They do not allow members talking about other laser companies...

How to Choose the Atlasnova 635nm RED Laser Pointer All Black Class IIIa

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I suggest ebay to anyone getting Atlasnova 635nm RED Laser Pointer All Black Class IIIa.

http://hulettblog1836.blogsatu.com/2008/12/07/how-to-choose-the-atlasnova-635nm-red-laser-pointer-all-black-class-iiia/

5mw 532nm Astronomy Powerful Green Laser Pointer - Silver

Silver Finish High Power Green Laser. We ensure that every high power green laser pointer is hand calibrated and tested to output at least 4.99mw and thus offers the expected stunning power expected of a real constant wave green (532nm) laser pointer, much brighter to look at than a regular red laser pointer and always with a visible green beam. This high power green laser pointer will impress your coworkers, family and friends. Use it for your next presentation and everybody will know that you are ahead of the latest technology. BONUS ITEMS INCLUDED - LED Flashlight Keychain and Microfiber Optical Cloth (1 set per order)

http://electronicslog.com/presentation-pointers/5mw-532nm-astronomy-powerful-green-laser-pointer-55840.html

Belfast flights targeted by laser pointers

At least five attempts have been made to dazzle pilots with laser pointers in the skies over Belfast over the last six months.

In the most serious incident early in August, the captain of a Boeing 737 was hit in the eye with a laser as he made his approach to Belfast City Airport.

On 31 October, numerous planes on final approach to the same airport were targeted by a green laser over a full hour.

The most recent involved a Boeing 737 at 4,700 feet ten days ago.

The British Airline Pilots Association said there had been prosecutions for similar offences in other parts of the UK and they would like to see anybody who did this put behind bars and taught a lesson.

A British Civil Aviation Authority spokesman said it took the threat to aviation safety extremely seriously.

'Any member of the public shining a light at an aircraft or helicopter could endanger the safety of the flight and any person found guilty of such an offence could face a custodial sentence,' he said.

A PSNI spokeswoman said they were looking for witnesses.

She said police were aware of a number of reports of laser lights being shone at planes and that it was an offence under the air navigation order to endanger aircraft.

http://www.rte.ie/news/2008/1201/laser.html