Main Characteristics of Laser

Characteristics of laser

(1) High brightness of laser: according to the general law, the power emitted by the light source in a unit solid angle in a certain direction per unit area is called the brightness of the light source in that direction. The improvement of laser brightness mainly depends on the high concentration of light in the emission direction. The emission angle of laser is very small (generally expressed in milliradians). It is almost a highly equal collimated beam, which can realize directional and centralized emission. Therefore, the laser has high brightness. The brightness of solid-state laser can be as high as 1011w / cn2sr. Moreover, after focusing, a laser beam can produce strong thermal effect due to its high brightness. The temperature in the focus range can reach thousands or tens of thousands of degrees, and can melt or even vaporize biological tissues or non biological materials that can absorb the laser.

(2) High directivity of laser: the high directivity of laser enables it to effectively transmit a long distance and ensure high power density for focusing. The laser emitted by laser is naturally emitted in one direction, and the divergence of beam is very small, only about 0.001 arc degree, close to parallel. In 1962, human beings first used laser to irradiate the moon. The distance from the earth to the moon is about 380000 kilometers. These two points are important conditions for laser processing.

(3) High monochromaticity of laser: the color of light is determined by the wavelength (or frequency) of light. A certain wavelength corresponds to a certain color. The wavelength distribution range of sunlight is about 0.76 μ m to 0.4 μ m, and the corresponding colors range from red to purple, so sunlight is not monochromatic. The light source emitting single color light is called monochromatic light source, and the light wave emitted by it has a single wavelength. For example, krypton lamp, helium lamp, neon lamp and hydrogen lamp are monochromatic light sources, which only emit light of a certain color. Although the wavelength of monochromatic light source is single, it still has a certain distribution range.

(4) High coherence of laser: coherence is the attribute of all wave phenomena. Light has wave particle duality, that is to say, it is composed of photons and has particle property; But from a macro point of view, it shows volatility. Light has volatility and therefore coherence.

Main characteristics of laser

(1) Good beam quality, with very good monochromaticity, directivity and stability;

(2) Optical fiber is both a laser gain medium and a guided wave medium of light. Therefore, the combination efficiency of pump light is quite high, the core diameter is small, and high power density is easy to form in the fiber. In addition, the fiber laser can easily extend the gain length, so that the pump light can be fully absorbed, and the total light-to-light conversion efficiency exceeds 60%;

(3) The matrix material is SiO2, which has excellent temperature stability; The cylindrical structure of optical fiber has high surface area / volume ratio, fast heat dissipation, and the ambient temperature is allowed to be - 20 - 7000c. The heat load of its working material is quite small, without cooling system, and can produce high brightness and high peak power, up to 140 MW / cm2;

(4) Small size, simple structure, working material is flexible medium, which can be designed to be quite small and flexible, easy to use, easy system integration and high cost performance;

(5) As a laser medium, doped rare earth ions have a very rich energy level structure. The energy level transition covers a wide band from ultraviolet to infrared, and there are many energy levels that can realize laser oscillation. It can be designed and operated in a wide spectral range (455-3500nm). In addition, the fluorescence spectrum of glass fiber is quite wide. A tunable fiber laser can be obtained by inserting an appropriate wavelength selector, and the tuning range has reached 80nm;

(6) The technology of silicon fiber is now very mature, so it can produce high-precision and low loss fiber, which greatly reduces the cost of laser.

(7) It has natural flexibility and compatibility with conventional transmission optical fiber in material and geometric size, so it is easy to integrate optical fiber, low coupling loss and easy to use.

(8) It can work under harsh environmental conditions, such as high impact, high vibration, high temperature, etc.

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Which Is a Better Design to Put on a Beer Pong Table?
Which Is a Better Design to Put on a Beer Pong Table?
Nah, Dude save yourself time and money. Just purchase some cheap spray paint. Paint DO NOT VOMIT HERE on your table and everywhere else you DO NOT want puke. Your good to go! Good Luck Beer Pong Guy!1. Help me with my BEER PONG TABLE :) 10 POINTS?beerpongtable.com2. What paint and coating do i use for a beer pong Table?Do what I do when I make/paint things, use trail & error. Try out your paints etc.on a waste piece of ply, much more fun to do it all yourself3. Where can i buy an inflatable beer pong table here in the philippines?Inflatable Beer Pong Table4. how do i make a beer pong table?Advice on building Beer Pong Tables Large areas of paint: The best way to do the larger parts of the design is just spray paint with masking tape pressed down to prevent bleeding. Sanding the table down on places where you expect paint edges to be present also cuts down on bleeding. Ours bled a little on most edges, but we just put down white electrical tape on the points where the paint met the wood and it looked fine. If you have the resources, buy/rent a professional-grade low pressure paint spray gun (check out Home Depot or other home improvement stores) and you should not have any bleeding. Lettering For the more intricate parts, we got some heavy, glossy paper meant for LaserJet printers, and cut them out by hand. It was a pain, but it was the best way to do it. You can probably get away with thinner paper. Basically, thinner paper is more likely to let the polyurethane soak through, but it's also less likely to stick out of the poly (you can run your finger over the letters in our first table and feel a tiny ridge). If I were you I would get heavy paper, and then just poly the hell out of it (5 coats, wait 24 hours between each coat). Oh, and get a clearcoat/polyurethane that goes on clear. The white parts on your table (if any) will get a brownish tint otherwise. Graphics For the graphics on our basketball court table (ACC text and the flag) we went to the actual court and just took some digital pictures. With a little help in Photoshop, we were then able to get the graphics the right size and shape (for example, taking a picture of the "ACC" meant that it was kind of like a trapezoid, with the top part of the text not as wide as the bottom, since I took a picture from an angle as opposed to a bird's eye view). Anywho, for those we just went to Kinko's and printed it out on their good computer and color printer. Then we glued it on and polyeurethaned over it. Keep in mind you can always look for graphics online and just print them out (Google has an Image search feature that works well). Sturdy construction We do not have any plans drawn out (well, not on my computer anyway), but it's pretty easy to make a sturdy table. If you've got over $150 allocated for this, do not spare any expense on quality. 3/4" pine plywood is the sturdiest non-expensive board you can get. It will come in an 8'x4' section, but feel free to cut it down (but 8x4 is a nice size). If you've got money to waste, you can even get 3/4" oak. It will look better and is sturdier. You are going to want to build a sturdy frame underneath the table. A complete border of 2x4s should lay underneath the plywood. This not only looks good, but provides most of the anti-warping support. You are also going to want to spend the extra couple of bucks for two more 8' lengths of 2x4s to lay lengthwise along the underneath of the table (so you will have something like four 8-foot 2x4s underneath the table lengthwise, and then two 4-foot lengths at the edge). Legs are pretty easy. We use 4x4's, which is sturdy as hell but does not look great. If you paint them, they might look fine. In any event, a 3/4" plywood with the said frame underneath will never warp, and can even handle a few drunk college boys standing on top of it (not that I would suggest that). Misc Also, get trim for the edge of the table. It's $1/ft. and well worth it. It makes the table look much better, and even stops the occasional ball from rolling off. And to make sure that the table can handle all the beer that will get spilled, use a ton of polyurethane/clearcoat. If you have the time, do over 5 coats (10 is probably the most you will need). Follow the directions on can, but you should most likely not do more than one coat a day (bubbles could form if it does not dry all the way).
What Else to Do on PS3?
What Else to Do on PS3?
What else to do on PS3?Start renting movies. That's mostly what I use mine for these days. Do you want to know what other games you should buy? First I agree with the guy above me about the Assassins' Creed games and Uncharted 2. They are great games. Here is a list of other games you should check out. Buy them used from gamestop because you have 7 days to return them in case you do not like them or just rent them first. Batman Arkham Asylum-best comic book adaption and a must play Marvel Alliance 1 and 2- great to play with friends, up to 4 Red Dead Redemption-must have single player game, has online too but the single player is better The God of War Collection and God of War 3 Castlevania: Lord of Shadows- similar style to God of War Darksiders-similar style to God of War Mass Effect 2-must have single player Dead Space 1 and 2- best sci-fi horror Fear 2: Project Origin-more sci-fi horror Silent Hill Homecoming- eeriest horror Condemned 2- Metal Gear Solid 4-lot's of long cut-scenes but terrific story and gameplay. especially the boss battles Resistance 2 Army of Two: 40th Day-much better online but can play co-op on same screen Borderlands- it is better played online with a friend or 2 Heavenly Sword-short game but stunning production Saints Row 2- looser more over-the-top style of GTA Oblivion-best rpg Brutal Legend-great if you like heavy metal music and lore Transformers War for Cybertron Red Faction Guerrilla- the best destruction engine that allows you to break almost anything Fallout 3-must have single player game Prince of Persia Valkyria Chronicles-amazing game that is often overlooked Far Cry 2-slightly different fps than most with great African setting and good story Heavy Rain-best adult psychological thriller Pure- best atv racing NBA 2k 11-best basketball Fight Night Round 4-much better than 3, and the new Fight Night Champions Just Cause 2-adrenaline rush, open world gameplay Ratchet and Clank: A Crack in Time-best in the series The Sly Collection Civilization Revolution-great strategy Sonic Ultimate Genesis Collection-over 40 classic titles Soulcaliber 4-best 3d fighter The Orange Box- 4 great games in one Yakuza 3- Japanese mob story with fun side challenges— — — — — —Do you play any special floor time games with your baby such as "pattycake or peek-a-boo"? Any other games?I usually crawl behind him and he looks right behind me to see if I am following him and then he goes faster and starts laughing cause he thinks its funny. He also has this activity table where I just take off the legs and while he is sitting down we play with it together— — — — — —Is MGS4 worth getting a Playstation 3 for even if your not interested in other games but a fan of MGS series ?MGS4 is suppose to be the final chapter of Metal gear solid series at least for snake it is. This game was probably the main reason many people decided to get a ps3 just because of this game. This game is a visual masterpiece and the gameplay is aweesomee. This game has everything that a movie has and at the same time you are playing it. It has suspense,action, some humor and overall a fantastic conclusion (in my opinion) to the MGS franchise. This game is honestly a must have for the ps3. The only down side of this game is if you are one of those people who could give a rats *** about the story line and just want to play then you wont get the full experience. Some people say that movie scenes are way to long ,but thats because if you never played the MGS franchise it tries to explain everything and so that it basically breaks down the whole MGS franchise. I played that game twice already and probably going to play it again once i get it back from my friend. To me it was a piece of art and action packed game ,but everyone has the same opinion as i do. So its up to you man— — — — — —Would the video game industry be the same without Mario? What other games has Mario influenced?The video game industry would be VERY different w/o Mario. Mario is an icon in his own name. Super Mario Brothers would not exist.the Nintendo would not have been developed (or have made millions of dollars), arcade games would not be the same, Donkey Kong would need someone else to throw barrels at, Sonic would need someone else to copy (then create his own multi-million dollar franchise).Mario has influenced the game world greatly. .If Mario were gone. .through a VERY VERY VERY VERY VERY long series of gaming relationships.Halo would not exist.NOOOOOOOOOOOOOOO.
How to Protect Data on IOT Devices
How to Protect Data on IOT Devices
Before obtaining internet of things devices or solutions, please first ensure their design security. In some environments, this may not be feasible due to factors such as traditional products, price points, or simply because you don't have enough details on how to protect them.If the provider is unable to provide sufficient information about device security methods, it should reconsider purchasing IOT devices. If the IOT device is already in place, security can be established around it.In addition, it should also ensure that manufacturers of Internet of things devices can provide timely patches and updates for the whole lifeline of the device. After the product entered the market, many security vulnerabilities were found. Since the service life of IOT devices may be as long as 10 to 20 years, their manufacturers should be able to provide you with patches and updates during this period.Here are eight effective ways to protect data on IOT devices.1. Learn about the advantages of connecting to the InternetDon't connect smart devices to the Internet just because they have functions. First, you should check the functions available in your device without connecting it to the Internet. You may find that your smart device has good functions and can be used without the Internet. In this case, it is best to use the device offline. This is a good way to protect your safety without spending any money.2. Use auxiliary networkMost of the time, your WiFi router can create multiple networks to help you create restricted access for family and guests. You should also consider creating an additional network for IOT devices. When accessing a connection through a smart device, this will help you prevent unauthorized access to sensitive data. Having a separate connection to act as a buffer will help ensure that no external entities are allowed to access your shared files and other types of encrypted data.3. Continue to change the passwordIt is important that you constantly change your passwords on your PC, personal accounts, and mobile devices. It should also be remembered that it is equally important to change the password used on IOT devices. Use these passwords carefully and ensure that each device has a unique password. You can use the password manager to remember your password, or even use traditional pen and paper methods. Remember that each password must be changed twice a year.4. Do not enable universal plug and playAlmost all smart devices have a function called UPnP. With this feature, different devices can find each other and connect to each other. This feature makes devices more convenient because you do not need to configure each device separately. However, you need to know that the UPnP protocol uses the local network for connection, so it is easy to be accessed from the outside. In the event of an attack, external entities may be able to access multiple devices at the same time. Therefore, it is best to turn off the UPnP function on each device.5. Update each deviceYou should enable automatic update and there is no automatic update. Please check the firmware update regularly. This is required because it is the way to install a new security patch on the device. As hackers and other intruders continue to come up with new ways to invade IOT devices, technology manufacturers continue to strive to deal with such threats with security measures. Therefore, ensuring that all devices are updated will help to enhance the security of the whole system.6. Reduce the use of cloud technologyAs you know, most IOT providers provide free cloud storage with their devices. The reason is that it is considered an emerging technology. However, this technology has some potential disadvantages. The first is that if you want to access the data stored in the cloud, you need an active connection. Without a connection, you can't access the information. Second, when you access your account, outsiders may invade your connection. So before you start using the cloud, make sure you are familiar with how to protect data security and thoroughly understand privacy measures.7. Pay attention to the storage location of wearable devicesWearable devices use WiFi connections to collect and store personal data so that they can provide you with accurate analysis in the future. Therefore, when you bring a wearable device to a public place, because it is connected to public WiFi, anyone connected to the same network can immediately access your data. Therefore, it is best to avoid wearing wearable devices with shared networks. In case you really want to use it, make sure to disable it when you are not using the device.8. Avoid using risky equipmentSome IOT devices need to be continuously connected to the Internet to operate effectively. Others don't bring much efficiency to your life as you think. Therefore, it is a good habit to evaluate the practicability of the equipment from time to time. If you think they don't help your life, or they seem risky, it's best to discard them. In addition, if only one device can replace multiple other devices, invest in the device. This is because the fewer equipment used, the fewer risk factors.
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