Special green laser pointer for astronomy
Class 1 laser is not bright enough to be used as a pointer. Therefore, the green laser pointer belongs to Class 2 or Class 3A. They emit up to 5 milliwatts of energy and produce exposures that damage the eyes faster than blinking. The United Kingdom has banned the sale of Class 3A laser pointers, although they are legal in Canada and the United States. Many states and local governments in the United States have issued regulations restricting the use of Class 3A pointers. Eye exposure to the instantaneous scanning of a Class 2 or Class 3 laser beam can cause temporary blindness, image retention, and glare, which can be particularly dangerous if a person engages in activities that are vital to vision. There are records showing cases of damage to the retina within a few seconds of exposure to a Class 3A laser pointer.
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Those specifically used by astronomers are designed to be placed in the finder mirror holder on the telescope barrel. This makes these high powered laser very suitable for use as indicators and seekers. When aligned with your telescope, the laser pointer used with the traditional finderscope produces excellent results. Before looking through the finder, you can see exactly where the telescope is pointing. In fact, continue reading and you will find another technique for using lasers to accurately check the position of the telescope. Next-generation laser pointers use diode lasers as light sources. The diode laser pointer initially produces a beam of 690 nm. The difference between 633 and 690nm may seem small because both are visible red wavelengths, but according to the interpretation of the human eye, the difference is large. The 633 nm seen by the human eye is five times brighter than 690 nm. This explains why the early diode laser pointer needed 5mW of power to match the brightness of the 1mW pointer at 633nm.
2021-12-22 11:31:48
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