But when the laser directly penetrates into the eyes, there may be some damage. Especially to some high power laser pointers, diffuse light probably damage the eyes, the focus are more likely to ignite flammable materials. Therefore laser pointers are not a toy, not suitable for children. When operating powerful laser pointer, wear special secure glasses would be safe, especially for the invisible laser. In a word, no matter how much power the laser power is, you need to avoid hitting into your eyes. Presentation Laser pointer are often used in educational and business presentations and visual demonstrations as an eye-catching pointing device. Green, presentation Laser pointer Pen will leave peopel a deep impression when you in business presentations.
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Green pen is the wavelength relations of light emitted 500-550nm, the wavelength sensitivity of the coefficient table, as is the closest one wavelength. Green is undoubtedly efficient light source, the eye more easily identified. The green light sensitivity of the human eye is higher than a lot of red; the other is green light scattering in the atmosphere more than red green light. Red Lasers, red laser pointers, wavelength 630-670nm green laser pointer is more for longer. The first red pointer was released in the early 1980s. Nowadays, the red laser diode technology has been very mature. More durable, the price is much more cheaper than ever. More easily transmitted red light air, dust, water vapor, so the light path can be seen to need more power. 100 mW red laser pointers probably only about 20 milliwatts, and green. . Do remember that red laser pointers are powerful since the light they emit is powerful when it hits a certain object and converges into a point. Now, more and more laser pointers and brightest flashlight sold in the market are class iiib with a power over 5mW.
Laser by shape, laser by wavelength, flashlight by lumens. Flashlight by brand, laser by flashlight, accessories. Blue-violet proposal Lasers, laser pointers with 405 nanometers wavelength of light are also called blue violet laser pointers. Although it is rarely prefered to the green and red ones, it could be used for what others do, which also reflects the individual unique aesthetic taste. It is probably not as much preferred lasers as an astronomy laser pointer, because brighter colors would make an object more visible in the sky. However it comes down to all other uses such as pinpointing something on the large screen or on the blackboard. Green Lasers, green laser pointers is now the world's most popular laser pointers, because the green light than red light 6 times more than red light beam significantly, while the price is much cheaper than the blue and yellow.
No public clipboards found for this slide. Select another clipboard, looks like youve clipped this slide to already. Create a clipboard you just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later. Now customize the name of a clipboard to store your clips. Description Visibility Others can see my Clipboard. Laser by paper color, laser by power, laser by application.
Common Laser Signs and Labels. Conclusion: Laser communication in space has long been a goal for nasa because it would enable data transmission rates that are 10 to 1,000 times higher than traditional radio waves. While lasers and radio transmissions both travel at light-speed, lasers can pack more data. It's similar to moving from a dial-up Internet connection to broadband. Astronomers could use lasers like very accurate rulers to measure the movement of planets with unprecedented precision. With microwaves, we're limited to numbers like a meter or two in distance, whereas lasers have a potential for getting down into well beyond the centimeter range. Thank you, recommended, linkedIn Corporation 2018, public clipboards featuring this slide.
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Lasers and eyes ul li What are the effects of laser energy on the eye? light in the visible to near infrared spectrum (i.e., nm) can cause damage to the retina resulting in scotoma (blind spot in the fovea). This wave band is also know as the"retinal hazard region". light in the ultraviolet ( nm) or far infrared (1400 - 10,600 nm) spectrum can cause damage to the cornea and/or to the lens. retinal damage may be associated with an audible"pop" at the time of exposure.
Visual disorientation due to retinal damage may not be apparent to the operator until considerable thermal damage has occurred. Laser Class ul li The following criteria are used to classify lasers. If the laser is designed to emit multiple wavelengths the classification is based on the most hazardous wavelength. continuous wave (CW) or repetitively pulsed lasers the average power output assignment (Watts) and limiting exposure time inherent in the design are considered. pulsed lasers the total energy per pulse (Joule pulse duration, pulse repetition frequency and emergent beam radiant exposure are considered. Control measures and Personal Protective equipment. Control measures controls beam controls Operating Procedures (SOPs) protective equipment (PPE) protection.
Joule (J) - a unit of energy Energy (Q) The capacity for doing work. Energy content is commonly used to characterize the output from pulsed lasers and is generally expressed in joules (J). Irradiance (E) - power per unit area, expressed in watts per square centimeter. Time continuous Output (CW) Pulsed Output (P) Energy (Watts) Time Energy (Joules). Types of Laser hazards ul li eye : Acute exposure of the eye to lasers of certain wavelengths and power can cause corneal or retinal burns (or both). Chronic exposure to excessive levels may cause corneal or lenticular opacities (cataracts) or retinal injury.
Acute exposure to high levels of optical radiation may cause skin burns; while carcinogenesis may occur for ultraviolet wavelengths (290-320 nm). Some lasers require hazardous or toxic substances to operate (i.e., chemical dye, excimer lasers). Most lasers utilize high voltages that can be lethal. The solvents used in dye lasers are flammable. High voltage pulse or flash lamps may cause ignition. Flammable materials may be ignited by direct beams or specular reflections from high power continuous wave (CW) infrared lasers.
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action occurs when an electron spontaneously returns to its ground state and produces a photon. the energy from this photon is of the precise wavelength, it will stimulate the production of another photon of the same wavelength and resulting in a cascading effect. highly reflective mirror and partially reflective mirror continue the reaction by directing photons back through the medium along the long axis of the laser. partially reflective mirror allows the transmission of a small amount of coherent radiation that we observe as the beam. radiation will continue as long as energy is applied to the lasing medium. Lasing Action diagram Energy Introduction Ground State Excited State metastable State Spontaneous Energy Emission Stimulated Emission of Radiation. Laser Output watt (W) - unit of power or radiant flux (1 watt 1 joule per second).
the laser light and transmits the remainder. Laser Components Gas lasers consist of a gas filled tube placed in the laser cavity. A voltage (the external pump source) is applied to the tube to excite the atoms in the gas to a population inversion. The light emitted from this type of laser is normally continuous wave (CW). Lasing Action ul li Energy is applied to a medium raising electrons to an unstable energy level. atoms spontaneously decay to a relatively long-lived, lower energy, metastable state. population inversion is achieved when the majority of atoms have reached this metastable state.
emit light that is highly directional, that is, laser light is emitted as a relatively narrow beam in a specific direction. Ordinary light, such as from a light bulb, is emitted in many directions away from the source. light from a laser is said to be coherent, which means that the wavelengths of the laser light are in phase in space and time. Ordinary light can be a mixture of many wavelengths. three properties of laser light are what reviews can make it more hazardous than ordinary light. Laser light can deposit a lot of energy within a small area. Laser Light ul li many wavelengths /li /ul. Common Components of all Lasers ul li Active medium active medium may be solid crystals such as ruby or Nd:yag, liquid dyes, gases like co2 or Helium/Neon, or semiconductors such as gaas. Active mediums contain atoms whose electrons may be excited to a metastable energy level by an energy source.
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Successfully reported this slideshow. Laser ppt, upcoming SlideShare, loading in 5, show More. No downloads, no notes for slide. B.rajashekar (08655A0407) adams engg college paloncha lasers. Fundamentals of Laser Operation. Laser Fundamentals ul li The light emitted from a laser is monochromatic, that is, it is of one color/wavelength. In contrast, ordinary white light is a combination of many colors (or word wavelengths) of light.