Green Laser Wavelength

Physics please help w/ problems?

ok I don't get how to do these problems @ all so please explain
Light of wavelength 575 nm falls on a double slit, and the first secondary maximum is seen at an angle of 16.5 degrees. Find the distance d b/w the slits

a blue-green argon laser passes through two slits that are d=0.500nm apart. on a screen 3.30m away from the slits, the first secondary maxima is 3.40 mm from the central maximum. What is the wavelength of this laser light?

ok, for these questions use the equation:

wavelength of light x distance from screen = distance between slits x fringe width

to find the fringe width in your equation you probably need to use some trigonometry using the angle you have and the distance from the screen. hope this helps

remember to use SI units eg length = Meters

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Green Laser Pointer II $69.99 Okay, just about everyone has a red laser pointer. Heck, we even sell a fine one here at ThinkGeek. But, we're pretty sure you want to be a superior geek - and doing it with a green laser is the way to go. This pointer is significantly brighter (about 50 times) than a red laser pointer and because of its unusual color it is much more noticeable. I mean come on, a 532 nm green laser wavelength is obviously superior to a laughable 650 nm red laser wavelength. And unlike a red laser, the green beam itself can be seen in mid-air in dark conditions, not just the laser beam dot. This allows the green laser pointer to be used for pointing to star constellations (skypointing) and also just generally look cool as hell. The green laser beam dot can be seen at much greater distances than with a red laser pointer. Since green direct injection laser diodes aren't readily available, this pointer is based on the use of Diode Pumped Solid State Frequency Doubled (DPSSFD) laser technology. A high power IR laser diode at 808 nm pumps a tiny block of Nd:YVO4 generating light at 1,064 nm which feeds a KTP intracavity frequency doubler crystal to produce the green beam at 532 nm. Features of this unit include: Very bright green laser at 532 nm wavelength Output power of Range of approximately 9,000 ft (2600 m) in darkness 1.1 mm beam diameter at source Momentary push button switch Solid, heavy duty construction Constant wave output (as opposed to pulse output) Takes 2 "AAA" batteries (not included) Can be used for skypointing, projection on low clouds, signaling, highlighting potential explosives Dimensions: 5.6" x .5" dia 90-day warranty Available in Black or Silver color Interested in quantity discounts or custom logo imprinting? More info here. Warning: Green lasers are very powerful. Pointing at aircraft may land you in jail. Without a Monopoly card to get you back out. Use it wisely.

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Green-Red Laser Pointer $59.99 Many people have a red laser pointer and some really cool people have the green laser pointer. But very few people have them both built into a single unit. Being the cutting edge geek that you are, we know you'll choose this dual output beauty. Why would you want to be like everybody else? The first laser pointer that projects a brilliant GREEN beam from one end and also a high-power RED beam. The GREEN beam is just as bright as other green pointers, range up to 2 miles in darkness, wavelength 532 nm. The green laser beam (not just the dot) is visible at night. The RED beam is the most powerful red laser allowed by the FDA, range 4000 ft in darkness. Power output Green Laser Specifications Output Mode - Constant wave Wavelength - 532 nm Batteries: 2 x AAA (included) Beam Dia. at Source - 1 mm Output Variance - 10% after 20 min. Body Color - Silver Beam Divergence - 1.2 mRad Output Power - Switch - Push Button Operating Lifetime - 2000 hours Class - IIIa Range 10,000 ft (3000m) in darkness Red Laser Specifications Wavelength - 650 nm Polarization - Linear (50:1) Batteries: 2 x AAA Beam Dia. at Source - 1 mm Output Variance - 5% after 20 min. Body Color - Silver Beam Divergence - 1.2 mRad Output Power - Switch - Push Button Operating Lifetime - 5000 hours Class - IIIa Range 4,000 ft (1300m) in darkness Dimensions - 6.8 in. long, 0.55 in. dia.

NcStar Green Laser $58.99 The Compact Green laser is an ultra bright and powerful green laser in a much smaller package than was available previously. The Weaver style mount will fit virtually any Weaver and Picatinny rails, making it possible to fit onto a wide variety of firearms. With precise windage and elevation adjustments, you will have a: quick, powerful, and precise laser aiming devise. With the supplied remote pressure switch, it gives you the flexibility to mount the laser anywhere on your firearm and be able to activate the laser when you want to. The laser is manufactured from aircraft quality anodized aluminum. Wavelength: 532 nm Maximum Output Power:

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Wavelength $81.25 Wavelength. Wave, Standing wave, Sine wave, Wave packet, Interference (wave propagation), Diffraction, Diffraction formalism, Angular resolution, Diffractionlimited system, Emission spectrum, Fraunhofer lines, Spectral line, Spectrum, Spectrum analysis Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 90 Publication Date: 2009/10/25 Language: English Dimensions: 5.98 x 9.01 x 0.21 inches

NcStar Compact Flashlight/Green Laser $64.99 The Tactical Green Laser/Flashlight allows you to quickly switch back and forth from a Laser to a Flashlight by just changing the front assemblies. The Tactical Green Laser/Flashlight is a super bright green laser or a bright 30 lumens Flashlight. With a Quick Detachable Weaver style mount, you can quickly install and remove the powerful green laser or Flashlight in seconds and mount it onto virtually any of your firearms without the use of tools. Precise windage and elevation adjustments, keeps your shots on target! Constructed of solid anodized aluminum, this laser/flashlight is tough and can take a beating. Wavelength: 532 nm Maximum Output Power:

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Laserglow Technologies Vega2 Hercules green portable laser $1191.91 Laserglow s Vega Series yellow portable laser uses advanced solid state sum frequency generation technology miniaturized into a 593.5nm portable laser. The Vega is truly a technological marvel allowing the portability of a handheld laser in a wavelength previously only available in benchtop lab lasers.

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Blue Violet Laser Pointer $89.99 A new laser color has just landed at ThinkGeek and we like what we see. Red and even green lasers are now fairly common but blue lasers not so much. So, if you want to have the latest fashionably cool laser color this year, we've got you covered. This laser outputs light in the 405 nanometer wavelength which produces a very unique blue-violet color beam, that is unusual for a handheld pointer. This is also the same wavelength used in Blu-ray DVD players. The shorter wavelength allows more data to be stored than on a standard DVD which uses a red laser (650 nanometer). This laser is certainly awesome but it's also useful for applications such as biomedical instrumentation, imaging, spectroscopy, laser induced fluorescence sensing, microscopy. And if you're not into any of those activities, then this laser can be used to write on photoluminescent material like our Glow Graffiti.

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Green Laser Wavelength 532nm 200mW Built-in 6LED Torch + 1 Pattern Filter+Holster

Types of Lasers - for removing tattoos

Laser Tattoo technology makes use of the theory that specific wave lengths of laser light  will be absorbed by various colors of ink. Some colors, like black and dark blue will absorb almost all colors while other colors only absorb a certain type of wavelengths, and thus, specific types of wavelength must be used to eliminate these colors.

Basically, the wavelength of the laser’s light needs to match the absorption spectrum of the chromophore (a chemical group able to absorb light selectively which results in the coloration of certain organic compounds in the skin).

This high energy absorption causes the ink molecules to swell and fragment into small pieces.  Some of these fragments will literally fly out through the skin surface while other remaining pieces will be removed by your immune system over a period of time, usually weeks to months. The skin normally absorbs very little of this heat energy and rather destroys the ink while leaving the surrounding tissues intact.  The following two lasers are currently among the most popular in the world.

Q switched YAG Laser

These lasers are used for many different purposes and  typically emit light with a wavelength of 1064 nanometers, in the infrared light range. However, they are also sold at 940, 1120, 1320, and 1440 nm capabilities.

They can operate in both the pulsed (referred to as Q switched) and continuous (this method is no longer used for removing tattoos because the patient's skin was exposed to the laser continuously to the extent that scarring could happen easily). Superpulsed CO2 lasers did help alleviate some of this burning however they weren’t considered fast enough to deliver a short enough pulse that would not scar while not being powerful enough to penetrate the dermal layers to the level of the ink.
Q-switching technology changed this.  It could deliver energy in a short (5-10 nano second) pulse of very high intensity energy.

This laser’s light is designed to be absorbed by both blue and black melanin (or natural pigments). It causes the melanin to be heavily fragmented - so small that the particles are able to be metabolized by your body’s lymphatic system (or be discharged or excreted from the body). The pigment mass expands quickly and causes the ink molecules to shatter.  They are then absorbed by what are called phagocytes.  This process causes the tattoo pigmentation to be removed without causing injury to normal surrounding tissues.

The Q-switched ruby laser

This equipment emits intense red light that passes without harm through the epidermal skin layers where it is targets specific pigments of tattoo ink. Just like the YAG, and others, its energy causes heat upon impact with the tattoo ink shattering it into tiny particles that are then absorbed by your immune system. Larger particles that are not fragmented can require additional laser sessions, often several are needed to completely remove the ink.

The ruby laser is FDA approved and although there may be some temporary skin lightening, it has not been known to affect the surrounding skin structures because the skin will not absorb the energy generated by the laser light, only the tattoo ink will. This technology is endorsed by the American Academy of Dermatology as the treatment of choice.

After the laser treatment, the area will turn white and often swells slightly. This white color will usually fade within less than an hour. A scab may form in the days following but will usually return to normal within 7 – 10 days.
In terms of wavelengths of light (as measured in nanometers) the following rules apply:

532nm – Emits a green light wavelength.  It is targeted to reds, oranges and pinks.
755nm – This red laser light targets green, turquoise, lighter blues and teal.
1064nm - this invisible radiation wavelength emits infrared light attracted to black, darker blues and browns.

These lasers can be used at the same time since they will only work on the colors that they are attracted to.  When considering laser therapy it is very important to understand the specific types of equipment that your practitioner needs to have and use in order to meet your particular needs  and determine your success.

About the Author

To learn more about tattoo laser removal treatment visit my tatoo removal cream site. You’ll also be able to read more about the growing popularity of tca tattoo removal.