You have two diffraction-limited laser b eams with different wavelengths (lamba 1) and (lambda 2) incident on a lens of focal length f, and you want the beams to focus to the same size spot. How would you accomplish this?
I think it has to do with either varying the starting diameter of the beam or varying the incident angle, but i'm not sure. Anyone have any insight on this? d = [(lambda)f]/[(pi)D]
Sure, there are several ways to do this. The spot size is basically given by the uncertainty principle x p >= hbar/2. But x is the spot size and p is the photon momentum. If we assume to two beams with the same width before the lens, but different frequency, then p will differ by the frequency, so x has to differ as well. Now, p for a photon depends on the energy of light (frequency, wavelength, or however you want to measure it) AND the direction. So if you want the same spot size (the same X) you need to change the direction of the rays of the photons. So you need to change the incident angle, which basically means you need to change the diameter of the incoming beam. A larger beam focused to the same spot size, will have a larger range of angles, so a larger range of momentums. But you already said that.
You could also change the angle. If you assume a beam that is not collimated, but is converging or diverging, it too will have a different spot size from a collimated beam. You said that too!
And I can think of a third way to do that, too. All materials, in practice, are dispersive, meaning they have different indices of refraction. That means a lens made with that material will bend different wavelengths by different amounts. So you could pick a special material that has a specific ratio of indices of refraction for the two wavelengths, such that the spot size for both beams are the same, despite the wavelengths difference. In practice, this probably will not be possible, but in theory, ti's an option!
Those are the 3 ways I can think of to get your desired result. But not, the focus will probably not be in the same plane!
56500 56500 Laser Lens Cleaner Eight brush system cleans off the entire laser lens Will not damage sensitive optical components Enjoy your Netflix titles more or improve your music archive by cleaning your optics in your CD or DVD ROM The Lens Cleaner uses eight staggered brushes that progressively pass over the laser lens to clean the entire surface. The cleaning process takes only a fraction of a second and can actually prolong the life of your disc player. Allsop even included easy-to-use voice instructions on the disc, so you know when it's done. Allsop Allsop, Inc Electronic Equipment Lens Cleaner Optical Disc Player Optical Drive VCR www.allsop.com
The Otis Optics Cleaning System contains everything you need to effectively care for the functionality of scopes rangefinders laser sighting devices binoculars cameras and eyewear. This kit includes Premium Anti-Fog Lens Cleaner Premium Lens Tissues cotton swabs an Otis Micro Fiber Lens Cloth and a Mohair Lens Brush. All components are neatly packed in a nylon softpack storage case for easy transport and can be interchanged with other Otis cleaning systems. Mfg: Otis SPECS: For Use On: binoculars rangefinders scopes flashlights lenses cameras eyewear etc. Weight: 0.310 lbs. dimensions: 4 x 4 x 2 inches.
Long Distance Laser Designator ND3X40. Green laser technology. 40mm lens. Illuminate a target at up to 400 yards. Oring seals keep water dust and dirt out. Adjustable bean (Rotary Optical Beam Collimator) allows quick adjustment of beam diameter and intensity Nitrogen charged to prevent lens from fogging. Includes scope mount (1 inch tube) with windage and elevation adjustments Weaver mount with dual size mounts (3/8 inch and 5/8 inch) Tripod mount carrying case momentary. Pressure switch and two Lithium CR123A batteries.
Zappos.com is proud to offer the SunCloud Polarized Optics - Carousel (Black Backpaint Laser/Gray Polarized Lens) - Eyewear: You can go round and round and never find a set of sunglasses as stylish and full featured as these Carousel sunglasses from SunCloud Polarized Optics. ; Injection molded Grilamid nylon frames are lightweight and durable. ; Suncloud frames and lenses feature an 8-base curvature, enabling the frame and lens to wrap on the wearer's face. Eight base frames offer added protection from annoying side glare and environmental elements such as wind, dust and particulate matter. ; Polarized lens eliminates glare for superior visual clarity, definition, color transmission, and optical comfort. ; Injection molded polycarbonate lens material offers lightweight wear and high impact resistance for added durability.The injection molded process also helps create a rigid polarizing film carrier and eliminates distortion. ; The Carousel features these lens options (note: all colors may not be in stock) : • Polarized Grey offers the truest transmission of natural colors. • Polarized Brown enhances contrast while maintaining the accuracy of color transmissions. • Polarized Rose provides an optically comfortable and pleasant lens. ; Offers 100% UV protection from the sun's harmful rays. ; Dimensions: Frame Width: 141mm Lens: 51mm high x 60mm wide Bridge: 16mm Temple Length: 116mm
Zappos.com is proud to offer the SunCloud Polarized Optics - Cookie (Brown Fade Laser) - Eyewear: This style brings you the perfect combination of fashion and function. ; 100% polarized polycarbonate lenses provide ultimate clarity and protection from the sun. ; Flexible injected nylon frame for durability and fit. ; Dimensions: Lens 59mm x 43mm H. Temple 139mm.
Zappos.com is proud to offer the SunCloud Polarized Optics - Cookie (Teal Fade Laser) - Eyewear: This style brings you the perfect combination of fashion and function. ; 100% polarized polycarbonate lenses provide ultimate clarity and protection from the sun. ; Flexible injected nylon frame for durability and fit. ; Dimensions: Lens 59mm x 43mm H. Temple 139mm.
Zappos.com is proud to offer the SunCloud Polarized Optics - Carousel (White Backpaint Laser) - Eyewear: You can go round and round and never find a set of sunglasses as stylish and full featured as these Carousel sunglasses from SunCloud Polarized Optics. ; Injection molded Grilamid nylon frames are lightweight and durable. ; Suncloud frames and lenses feature an 8-base curvature, enabling the frame and lens to wrap on the wearer's face. Eight base frames offer added protection from annoying side glare and environmental elements such as wind, dust and particulate matter. ; Polarized lens eliminates glare for superior visual clarity, definition, color transmission, and optical comfort. ; Injection molded polycarbonate lens material offers lightweight wear and high impact resistance for added durability.The injection molded process also helps create a rigid polarizing film carrier and eliminates distortion. ; The Carousel features these lens options (note: all colors may not be in stock) : • Polarized Grey offers the truest transmission of natural colors. • Polarized Brown enhances contrast while maintaining the accuracy of color transmissions. • Polarized Rose provides an optically comfortable and pleasant lens. ; Offers 100% UV protection from the sun's harmful rays. ; Dimensions: Frame Width: 141mm Lens: 51mm high x 60mm wide Bridge: 16mm Temple Length: 116mm
High Quality Content by WIKIPEDIA articles A parfocal lens is a lens that stays in focus when magnification/focal length is changed. There is inevitably some amount of focus error, but small enough to be considered insignificant.Zoom lenses (sometimes referred to as true zoom) are ideally parfocal in that focus is maintained as the lens is zoomed (focal length and magnification changed), which not only is convenient, but also has the advantage of allowing more accurate focusing at maximum focal length and then zooming back to a shorter focal length to compose the image. However, not all socalled zoom lenses are actually parfocal. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 92 Publication Date: 2010/09/29 Language: English Dimensions: 5.98 x 9.01 x 0.22 inches
The ND3x50 Laser Designator is the latest precision optical lighting instruments from Laser Genetics. Using advanced green laser technology. It is equipped with the strongest laser that we have ever manufactured for this application. The patented Rotary Optical Collimator allows full adjustment and control of beam diameter and intensity to focus light where you need it most. Rotating the collimator provides enough illumination to light a trail at night or paint a target up to 500 yards. Battery provides over 7 hours of continuous use. Unmatched source of illumination for Night Hunting Fishing Marine Rescue and EMS. Precision machined from high tech aluminum. Black matte anodized finish. Fully oring sealed for dust and water. Fully multi coated optical lens system. Nitrogen charged for antifog. 120 Brighter than the ND3 at 100 yards. 1 tube adapts to many mounting system. Dimensions: 9.45 l x 2.35 dia. x 1.0 dia. tube. Power supply: 2 CR123a battery (provided). Battery life: over 7 hours of continuous use. Rotary optical beam collimator allows quick adjustment of beam diameter and intensity. 532nm laser light frequency easiest light for the human eye to see. Amplified coherent light most efficient light for long distance illumination. Output power: 50mw. Range: up to 3.0 miles (extreme cold weather use).
The ND3 Laser Designator is a precision optical lighting instrument using advanced green laser technology. The patented Rotary Optical Collimator allows full adjustment and control of beam diameter and intensity to focus light where you need it most. Rotating the collimator ring to minimum creates a bright micro beam of green laser light visible up to 3 miles. Rotating the collimator to more open settings provides plenty of illumination to light a trail at night or paint a target at up to 250 yards. Battery life allows you to handle any emergency with over 7 hours of contniuous use. Why Green Light?. Green light is the most visible to the human eye and requires the least amount of eye adjustment at night. An eye that has adapted to daytime conditions generally has a maximum sensitivity around 555nm. Compared to the color red which optical spectrum is around 630 650nm eye is closer to the Green region of the optical spectrum at 510 530nm. Animal eyes are intensely illuminated by green laser light and clearly visible at extended distances when viewed through optics. For optimum night vision for hunting pair the ND3 with a high quality variable power scope having a 40mm or larger objective lens providing maximum light transmission. The included ND3 mounting system for 1 tubes provides full adjustment for windage and elevation for scope alignment. Additional mounts for binocular spotting scopes and weaver rails are included. Hunting and Spotting:. Allows wildlife viewing at long distance without causing alarm. Search and Rescue:. Laser beam is visible up to 3 miles providing pin point rescue location. Outdoors and Hiking:. Beam diameter is easily adjusted to be a light source for night hiking. 7 hour battery life. Oring seals keep out water dust and dirt. Nitrogen charged to prevent lens from fogging. Adjustable Beam (Rotary Optical Beam Collimator) Allows quick adjustment of beam diameter and intensit. Precision Machined from High Tech Aluminum. Black Matte Anod
All-in-one kit helps you protect and preserve the functionality of your optics so you can see the target clearly. Includes the necessary components to remove oil dirt and dust from glass and optics-grade carbonate leaving it resistant to fogging and further dust contamination. Use to clean lenses on scopes rangefinders laser sighting devices binoculars cameras and eyeglasses without damage or scratching. Mfg: Otis SPECS: Kit contents: ½ fl. oz. (14 ml) of lens cleaner mohair lens brush anti-fog lens swabs lens tissues and lens cleaning cloth.
First, a 10x lens is the most poplular and best power for a handheld magnifier. The BelOMO 20x 17.5mm (0.50'') Qaudruplet Loupe Magnifier has a viewing area of 0.28" (7mm), much larger than the Bausch & Lomb Hastings Triplet Magnifier...
The CD/DVD Laser Lens Cleaner is designed for use in CD and DVD players. It uses a 6 ultra-soft brush system to safely remove dust and dirt from the laser lens of the disc player. This will help ensure quality and consistency of laser performances and maximize performance levels.
A Deluxe Extra Large full fisheye Wide Angle Lens with Macro. Perfect for Skateboarders or Truly Capturing an Expansive Setting.High Speed Auto Focus, Day or Night Lens. Made of Pure titanium makes the lens one of the most durable and compact on the market...
Bushnell Trophy 1x25 mm 3 MOA Illuminated Red Dot Rifle Scope shows true color for top contrast! How many shades of brown exist? Limitless. But how many shades of brown do you see when you look through cheap-o optics? One...
CLEAN DR. LASER LENS CLEANERBLU-RAY - ZERO CLEARANCleaner is specifically design to safely clean Blu-ray playersThe 10-brush + Pocket cylcone clean process includes 10 flexible brushes strategically placed in a cyclone formation for optimal cleaningIts unique Zero-Clearance technology allows each brush to retract into a pocket to prevent knocking the delicate optical lens out of alignmentThis patent-pending system is especially important for Blu-ray players because the optics can be as close as 0...
Wave-optics simulation is an immensely useful tool for many applications. The simulation techniques in this book are directly applicable to atmospheric imaging, astronomy, adaptive optics, free-space optical communications, and LADAR...
This classic resource provides a clear, well-illustrated introduction to the essentials of optical design-from basic principles to cutting-edge design methods.
Prism and Lens Making: A Textbook for Optical Glassworkers, Second Edition is a unique compendium of the art and science of the optical working of glass for the production of mirrors, lenses, and prisms...
Cleaner is specifically design to safely clean PS3 game systems10-brush plus pocket cylcone clean process includes 10 flexible brushes strategically placed in a cyclone formation for optimal cleaningIts unique Zero-Clearance technology allows each brush to retract into a pocket to prevent knocking the delicate optical lens out of alignmentPatent-pending system is especially important for Blu-ray players because the optics can be as close as 0...
Cleaner is specifically design to safely clean Xbox 360 game systems10-brush plus pocket cylcone clean process includes 10 flexible brushes strategically placed in a cyclone formation for optimal cleaningIts unique Zero-Clearance technology allows each brush to retract into a pocket to prevent knocking the delicate optical lens out of alignmentPatent-pending system is especially important for Blu-ray players because the optics can be as close as 0...
It is necessary if your system has the following symptoms:
System shows a message "Disc Read Errors" or disc appears damaged or dirty on the screen.
System reads certain games or movies.
System loads games or movies longer than normal...
The DEWALT 12-Volt Max Inspection Camera is designed to provide visual access to hidden nooks and hard-to-see areas. The camera features a 3-foot, flexible snake-mounted camera lens with LED, a pistol-grip control, and a detachable LCD screen...
The IDEAL VFF5 is a hand-held, battery-powered tool, the VFF projects a highly visible red light into a fiber optic cable. The operator simply looks at the length of cable and where light is seen, there is a break...
The ultimate laser rangefinder for tournament play and avid golfers, the Bushnell Tour V2 rangefinder combines compact size with serious power, helping you figure out distances to the green within seconds...
Red/green dot sight 1x magnification 30mm objective diameter 1/2 MOA click value @ 100 yds 38mm tube diameter 4.0 MOA dot 16.5 field of view @ 100 yds 25mm exit pupil Flexible eye relief 3.74 7.4 oz Incl...
BSA Optics' Stealth Tactical Laser Light with Red, Greeen, AND Blue Dots
Stupid second law of thermodynamics got nothin on us - Help me figure out how to do something impossible?
All I wanna do is re-collimate a diffuse laser reflection...
35 mW of very green laser light shining on a small white plastic object is BRIGHT. The light seems readily-enough gathered with a large objective lens, but I get hung up there time and again.
Should I be using smaller gathering lenses and/or pinhole optics in some way?
Or hell, am I better off trying to gather the light with some sort of convex mirror?
Note: my desired gathered/focused/collimated output does not need to be a tiny beam - in fact, a beam with some surface area is preferable.
Can this be done with standard optics?
Good point, first poster - I have resigned myself to losing a lot of my original energy. My basic goal is to collimate my reflection well enough to be able to beam it through a beamsplitter and/or homemade interferometer
There are non-focusing optics that will concentrate diffuse light.
But really, without knowing the application it is pretty difficult to suggest the best strategy.
What does your problem have to do with thermodynamics? It seems the (except for being very complicated) you have not done anything irreversible by scattering the light.
Sorry, comments for this entry are closed at this time.
![0.42X FISHEYE LENS W/ MACRO FOR CANON EOS DIGITAL REBEL [Camera]](http://www.wyrenters.com/media/images/i/316YY5SFEQL._SL75_.jpg)
![Ideal Visual Fault Finder, VFF5 w/Lens Cap & Carrying Case [Misc.]](http://www.wyrenters.com/media/images/i/511t88gOJqL._SL75_.jpg)
Sorry, comments for this entry are closed at this time.