What is the wavelength range of magenta laser pointer?
The 650nm wavelength means that the green laser pointer emits light in a very narrow range around 650nm. Laser light at this wavelength is red. Green laser Pointers have a variety of power outputs and can be seen at night even at low power, so they are often used by astronomy enthusiasts to point out stars and constellations. The power of blue laser at 473nm is too low and unstable to be widely used. Until the development of blue laser diode with power over 1000mW and wavelength of 445nm, the blue laser pointer was mass-produced and popularized.These tools also clarify problems in the lecture hall. Students and teachers use laser Pointers for educational purposes. They helped as much with hiking as they did with hiking; The guide no longer needs to use physical extensions to point out nearby plants or important historical points. The laser designator highlights the same information with no extra effort.
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By "color," we mean the combination of all the light we think enters the eye. It's a mixture of wavelength and intensity. The colors we perceive depend on our surroundings. Human vision has an automatic white balance built in. It also searches the edges to sense changes in color to look for a local "white balance" in a scene that might be illuminated by different types of light (such as "daylight" or "soft white" (incandescent). Gradual changes in color are more difficult to detect. I don't think that's the purpose of your question, so I won't talk on "Color Perception" about how we define colors to print or display on a computer screen or render using color film. Let us not ask what "blue" means. We will use the following concept: blue is some kind of mixture of wavelength and intensity in the range of 400 to 475 nanometers. The red laser pointer (the cheap one) has a wavelength of 650 nm. A normal human eye has less response to long-wave receptors (called "red" in this diagram), less response to medium-wave receptors (" green "), and virtually no response to short-wave receptors (" blue "). So all the colors of a rainbow can be sensed through some combination of responses from these three receptors. The yellow sodium line is approximately equal to the number of "red" and "green" responses.
2021-12-08 11:41:14
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