The World-Wide Laser Industry Has Recovered Quickly

Despite a 30% dip in 2009, the world-wide laser industry recovered over 27% in 2010, to $6.37 billion; it is expected to grow over 12% in 2011 to $7.1 billion, according to the LFW Annual Laser Market Report.

As shown in the chart, 2/3 of the market is in the Communications and Materials Processing industries.

Diode lasers amount for 51% of the market and non-diode lasers account for 49%. One of the largest growth areas is fiber lasers, experiencing a 41% growth in 2010 and an even greater rate in 2011.

The demand for new laser technicians continued to outstrip the supply by over 4:1. Colleges report that 2010 grads received multiple job offers again in 2010. Job prospects for this year also look very good.

Reference: Overton, Gail, Anderson, Stephen G, Belforte, David A., & Hausken, Tom (2011). Skies may be clearing, but fog still lingers. Laser Focus World, January 2011, 40-42. http://www.qmags.com/2FE1161B162147DB111616AC3513143E462FF14B817.htm

Laser and Optics Applications Modules

The applications of lasers, optics and fiber optics in energy, manufacturing, telecommunications, medicine, defense, environmental control and consumer products have expanded enormously in the last decade - and new applications (such as displays and solid-state lighting) are emerging daily. For this reason, Photonics (lasers, optics and fiber optics) is regarded as a critical “enabling technology”. And because of this role, the need for new photonics technicians has grown to an annual rate of more than 2,100 jobs in 2009. (OP-TEC Industry Survey)

Some of these jobs are being filled by recent graduates of the 30+ photonics colleges in the U.S. Others are being filled by the infusion of photonics education/training in these photonics-enabled fields. Some colleges that offer technician programs in these other fields are adding photonics education to their existing curricula. Others are restructuring their technical curricula into an “electronics systems core” with specialties in emerging fields like photonics. And many colleges are beginning to offer photonics courses to employed technicians that have been reassigned to jobs using photonics equipment and processes.

OP-TEC has responded to these educational needs in photonics by creating flexible curriculum and teaching modules that can be used to adapt programs and courses to the variety of education and training requirements needed by industry. These modules are configured in two categories:

Two Foundation Courses in Photonics: “The Basics”

• Fundamentals of Light and Lasers (six modules)
• Elements of Photonics (six modules)

Nineteen Application Modules in Lasers, Optics, Electro-Optics and Fiber Optics: "The Photonics Enabled Technologies (PET)"

Applications in Manufacturing:

• Laser Welding & Surface Treatment
• Laser Material Removal: Drilling, Cutting & Marking
• Lasers in Testing & Measurement: Alignment, Profiling and Position Sensing
• Lasers in Testing: Interferometric Methods and Nondestructive Testing

Applications in Defense and Homeland Security:

• Lasers in Forensic Science & Homeland Security
• Infrared Systems for Homeland Security
• Imaging System Performance for Homeland Security Applications

Applications in Biomedicine:

• Lasers in Medicine & Surgery
• Therapeutic Applications of Lasers
• Diagnostic Applications of Lasers

Applications in Environmental Monitoring:

• Basics of Spectroscopy
• Spectroscopy & Remote Sensing
• Spectroscopy & Pollution Monitoring

Applications in Optoelectronics:

• Photonics in Nanotechnology
• Photonic Principles in Photovoltaic Cell Technology
• Photonics in Nanotechnology Measurements: A Study of Atomic Force Microscopy

Other Applications:

• Principles of Optical Fiber Communications
• Photonic Devices for Imaging, Storage & Display
• Basic Principles & Applications of Holography

These modules, based on The National Photonics Skill Standards for Technicians, have been reviewed by industry experts and tested in classes/labs. They are being used in a variety of technical education curricula to support the photonics content needed in areas that are enabled by photonics. They will also be used by faculty and others to learn about these new applications of photonics in their particular field of interest.

OP-TEC will continue to add to these PET modules as the needs arise. In 2010, we will be focusing on energy and solid state lighting applications.

For more information about OP-TEC’s PET modules or to obtain review copies, please click here to visit our website. If you have any questions or comments, please e-mail us at op-tec@op-tec.org.

What would life be like without lasers? Part C - Using Lasers to Burn and Read CDs and DVDs

CDs and DVDs are everywhere these days. Whether they are used to hold music, data or computer software, they have become the standard medium for distributing large quantities of information in a reliable package. Compact discs are now easy and cheap to produce. If you have a computer and CD-R drive, you can create your own CDs, including any information you want.

The Disc
A CD is a fairly simple piece of plastic, about four one-hundredths (4/100) of an inch (1.2 mm) thick. Most of a CD consists of a piece of clear polycarbonate plastic, shaped like a disc. During manufacture, this plastic is impressed with microscopic bumps arranged as a single, continuous, extremely long spiral track of data. Once the clear piece of polycarbonate is formed, a thin, reflective aluminum layer is sputtered onto the disc, covering the bumps. Then a thin acrylic layer is sprayed over the aluminum to protect it. The label is then printed onto the acrylic. A cross section of a complete CD looks like this: The Spiral
A CD has a single spiral track of data, circling from the inside of the disc to the outside. What the picture on the right does not even begin to impress upon you is how incredibly small the data track is -- it is approximately 0.5 microns wide, with 1.6 microns separating one track from the next. (A micron is a millionth of a meter.) And the bumps are even more miniscule...

The Bumps
The elongated bumps that make up the track are each 0.5 microns wide, a minimum of 0.83 microns long and 125 nanometers high. (A nanometer is a billionth of a meter.) Looking through the polycarbonate layer at the bumps, they look something like this:The bumps are arranged in a spiral path, starting at the center of the disc. The CD player spins the disc while the laser assembly moves outward from the center of the CD.

CD Player Components
The CD player has the job of finding and reading the data stored as bumps on the CD. Considering how small the bumps are, the CD player is an exceptionally precise piece of equipment. The drive consists of three fundamental components:

• A drive motor spins the disc.
• A laser and a lens system focus in on and read the bumps.
• A tracking mechanism moves the laser assembly so that the laser's beam can follow the spiral track.

You will often read about "pits" on a CD instead of bumps. They appear as pits on the aluminum side, but on the side the laser reads from, they are bumps.

The incredibly small dimensions of the bumps make the spiral track on a CD extremely long. If you could lift the data track off a CD and stretch it out into a straight line, it would be 0.5 microns wide and almost 3.5 miles (5 km) long! To read something this small you need an incredibly precise disc-reading mechanism. The key element in this mechanism is the pinpoint beam of a laser.

The fundamental job of the CD player is to focus the laser on the track of bumps. The laser beam passes through the polycarbonate layer, reflects off the aluminum layer and hits an opto-electronic device that detects changes in light. The bumps reflect light differently than the "lands" (the rest of the aluminum layer), and the opto-electronic sensor detects that change in reflectivity. The electronics in the drive interpret the changes in reflectivity in order to read the bits that make up the bytes.

The hardest part is keeping the laser beam centered on the data track. This centering is the job of the tracking system. The tracking system, as it plays the CD, has to continually move the laser outward. As the laser moves outward from the center of the disc, the bumps move past the laser faster. Therefore, as the laser moves outward, the spindle motor must slow the speed of the CD. That way, the bumps travel past the laser at a constant speed, and the data comes off the disc at a constant rate.

CDs store music and other files in digital form -- that is, the information on the disc is represented by a series of 1s and 0s. In conventional CDs, these 1s and 0s are represented by millions of tiny bumps and flat areas on the disc's reflective surface.

To read this information, the CD player passes a laser beam over the track. When the laser passes over a flat area in the track, the beam is reflected directly to an optical sensor on the laser assembly. The CD player interprets this as a 1. When the beam passes over a bump, the light is bounced away from the optical sensor. The CD player recognizes this as a 0.

The advent of CD burners marked a huge cultural shift. The technology made it feasible for the average person to gather songs and make their own CDs. Today, writable CD drives (CD burners) are standard equipment in new PCs, and more and more audio enthusiasts are adding separate CD burners to their stereo systems.

CD burners darken microscopic areas of CD-R discs to record a digital pattern of reflective and non-reflective areas that can be read by a standard CD player. Since the data must be accurately encoded on such a small scale, the burning system must be extremely precise.

In addition to the standard read laser, a CD burner has a write laser. The write laser is more powerful than the read laser, so it interacts with the disc differently: It alters the surface instead of just bouncing light off it. Read lasers are not intense enough to darken the dye material, so simply playing a CD-R in a CD drive will not destroy any encoded information.

Questions or comments? E-mail us!

References:

Brain, Marshall. "How CDs Work." 01 April 2000. HowStuffWorks.com. <http://electronics.howstuffworks.com/cd.htm> 02 November 2009.

Harris, Tom. "How CD Burners Work." 01 August 2001. HowStuffWorks.com. <http://computer.howstuffworks.com/cd-burner.htm> 02 November 2009.

What if there were no lasers today?

When you hear the word, “laser” what are you reminded of? Luke Skywalker? Star Wars? High-tech wars between spacecraft?

Well, those concepts make good movies and TV shows, but they don’t make very good sense - in a practical way. In the last 40+ years, we have created a wide range of lasers (some whose output you can’t even see) and we’ve learned how to control them and use them to make our life better and to do things we’ve never been able to do with any other device - incredible breakthroughs in medicine, communications, manufacturing, entertainment and lots more. Unless we happen to be involved in the development of some application of the laser we probably don’t even know they are being used - right before our eyes!

Lasers now come in a variety of configurations and output wavelengths (colors), in continuous and pulsed beams, and at high and low power levels. We can often find a “laser solution” to a particular problem by selecting a laser with an output that suits our needs best. The unique properties of lasers that make them useful are:

• Monochromatic - Most lasers emit a beam of light at a very pure color (or wavelength). This means that the beam will be selectively transmitted, absorbed or reflected when other beams of light are not affected the same way.


• Collimated - A laser ray can be made to remain a very narrow beam that will travel long distances without spreading out much. A laser beam can be sent all the way to the moon and spread so little that it still makes a powerful spot when it hits something.


• A powerful Source of Heat that can be directed and pin pointed to an exact spot where it may melt or vaporize the target material, and yet leave the surrounding material unaffected.
  
• Coherent - Because laser light is much better organized than ordinary light, lasers have the same “information-carrying” properties that radio waves have, except the laser is working at much, much higher frequencies. This allows huge amounts of information, and many, many channels to be sent over a laser beam. Sometimes the laser beam is sent in the air; and sometimes it is “piped” in tiny plastic or glass strands called “fiber optics”.

So what are some common uses of lasers that we use every day? Here are a few:

Supermarket Checkout Systems
A low-power laser beam is scanned across the “bar codes” that are attached to products we buy. When we check out at a superstore, we just place the product with its bar code face down on the window of the scanner, the laser beam sweeps across the bar code and the reflected laser beam is read as a code that identifies the product. This uses the collimated and monochromatic characteristics of the laser.

LASIK Eye Surgery
LASIK (laser-assisted in situ keratomileusis) is a surgical procedure that uses a laser to correct nearsightedness, farsightedness, and/or astigmatism. In LASIK, a thin flap in the cornea is created using a femtosecond laser. The surgeon folds back the flap, and then removes some corneal tissue underneath using an excimer laser. The flap is then laid back in place, covering the area where the corneal tissue was removed. With nearsighted people, the goal of LASIK is to flatten the too-steep cornea; with farsighted people, a steeper cornea is desired. LASIK can also correct astigmatism by smoothing an irregular cornea into a more normal shape. This application uses the collimated, monochromatic and heat properties of the laser. (Unfortunately, laser pioneers are too old to be considered good candidates for LASIK.)

Laser Printers & Copiers
The physical phenomenon at work in a laser printer is static electricity, the same energy that makes clothes in the dryer stick together. A laser printer uses this phenomenon as a sort of "temporary glue" to hold toner on a photoconductive drum. The laser "writes" the print information on a photoconductive revolving drum, which then transfers it to a sheet of paper. This uses the collimated and heat properties of the laser. The information is then sealed to the paper with heat from a fuser, producing a very high-resolution copy.
(From www.howstuffworks.com/laserprinter.htm )

There are more laser applications to talk about (internet, displays, entertainment, pointers, and defense/homeland security equipment); but, those will have to wait until there’s another blog posting.

Questions or comments? Post your comments here or e-mail me!