What is the use of the laser pointer during the day
Inside the laser centering tube, a specially designed metal heat sink cooling system protects the high power laser pointer tube at the most stable temperature. Even if the user chooses a high-power laser line generator, it just keeps the performance stable, there is no fan for forced heating, but the line generation is quiet. It also ensures a long service life of more than 8000 hours. This red laser line generator has no wrong line alignment, effectively ensuring the most precise and accurate line projection. The freedom of rotation and vibration of molecules complicates the cooling of molecules (rather than atoms), which affects their absorption and emission of photons. Therefore, the absorption and emission of photons will cause the molecules to enter a "dark state" where they no longer participate in the cooling process. Despite the many challenges, David DeMille of Yale University and his colleagues still tried to use a 30mw green laser to cool strontium fluoride diatomic molecules in 2014. In order to see the laser "spot" on the wall or surface indoors or under dim light, a 5mw green laser pointer is enough. The most demanding general-purpose pointing applications are pointing objects in bright sunlight, such as a tour of a city building during the day, and pointing stars at night when you need to see a beam of light in mid-air. For these purposes, 5-25 mW should be no problem, and for harsh conditions (high ambient light brightness, showing stars to a large group of people) the maximum is 50 mW.
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As the blue laser pointer pointing at the atomic gas cooled to an ultra-low temperature, it first appeared in the late 1970s, completely changing the quantum state of the material being studied. The first batch of Bose-Einstein condensate was manufactured in the laboratory in 1995. The first Fermi-Dirac condensate was created in 2003, which are two important milestones in this technology. This technology relies on the fact that photons carry a small amount of momentum. Under certain conditions, the reabsorption and re-emission of photons can reduce their random motion, thereby reducing their temperature. In this latest work, John Doyle of Harvard University and his colleagues have now cooled a three-atom hydroxyl strontium molecule named after the Greek hero Sisyphus, who was forced to A boulder pushed to the top of the mountain, rolled down and then often resembled this work forever. The Sisyphus cooling process is a process in which molecules pass through the "climbing" process, and the potential energy generated by the burning green laser pointer standing wave loses kinetic energy.
2022-01-05 12:06:28
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