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Content:
Since the laser is the 20th century, following the atomic energy, computers, semiconductors, after another great invention of human beings, known as "the fastest knife," "the most accurate of the foot," "the brightest light" and "exotic laser," . Its brightness of the sun's 10 billion times. Its principle as early as 1916, the famous physicist Albert Einstein has been found, but not until 1958 was only the first successful laser manufacturer.
What is a laser? What are the characteristics of it?
"Light by stimulated emission," is called the Laser
Laser Features:
(A) directional light-emitting
Ordinary light source is emitting in all directions. Let the light emitted in one direction communication, need to source a certain condenser fitted with devices such as car headlights and searchlights were installed condenser mirror effect, so that radiation is pooled together in one direction injection.
(B) high brightness
Before the invention of lasers, artificial light in the high-voltage pulsed xenon lamps in the brightness of the highest comparable brightness of the sun, while the ruby laser laser brightness, can exceed tens of billions of times more xenon lamps. High brightness of the laser, it can illuminate distant objects. Ruby laser beam emitted to generate the illumination of the moon is about 0.02 lux (light-degree units), the color red, the laser spot visible.
(C) the color of extremely pure
The color of light by the wavelength of light decision. Launch of single-color light source as monochromatic light source, which emitted a single wavelength, but there is still a certain degree of distribution. If neon is only red emission wavelength range of the distribution is still 0.00001 nm, the red neon issued, if a careful identification of still includes dozens of red. Laser output light, the wavelength distribution is very narrow, so very pure color. To the output of red helium-neon laser, for example, the wavelength of light distribution can be narrow to 2 × 10 ^ -9 nano is the krypton red wavelength of light emitted distribution of two ten thousandths. Thus,
The monochromatic nature of laser is far more than any kind of monochromatic light.
(D) The energy density significantly
Photon energy is E = hf to calculate, in which h is Planck's constant, f is frequency. From this, the higher the frequency, the higher the energy. Laser frequency range of 3.846 * 10 ^ (14) Hz to 7.895 * 10 ^ (14) Hz. The electromagnetic spectrum can be broadly divided into: (1) radio waves - wavelengths from thousands of meters to 0.3 meters; (2) Microwave -- - the wavelength from 0.3 meters to 10 ^ -3; (3) infrared - wavelengths from 10 ^ -3 m to 7.8 × 10 ^ -7 m; (4) visible light - the wavelength from 780-380nm,
Just inside the atom or molecule changes the electronic state of motion of electromagnetic waves emitted; (5) ultraviolet - wavelengths from 3 × 10 ^ -7 m to 6 × 10 ^ -10 meters. (6) X-rays - wavelengths from 2 × 10 ^ -9 m to 6 × 10 ^ -12 m; (7) γ-rays - is the wavelength from 10 ^ -10 ~ 10 ^ -14 meters electromagnetic waves.

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laser is the 20th century, following the atomic energy, computers, semiconductors, after another great invention of human beings, known as "the fastest knife,"吵缓 "the most accurate of the foot," "the brightest light"正碰衡举做 and "exotic laser," . Its brightness of the sun's 10 billion times. Its principle as early as 1916, the famous physicist Albert Einstein has been found

Content:
Since the laser is the 20th century, following the atomic energy, computers, semiconductors, after another great invention of human beings, known as "the fastest knife," "the most accurate of the foot," "the brightest light" and "exotic laser," . Its brightness of the sun's 10 billion times. Its principle as early as 1916, the famous physicist Albert Einstein has been found, but not until 1958 was only the first successful laser manufacturer.
？ What is a laser? What are the characteristics of it?
"Light by stimulated emission," called the Laser Laser characteristics:
（一） (A) directional light source is a common light in all directions. Let the light emitted in one direction communication, need to source a certain condenser fitted with devices such as car headlights and searchlights were installed condenser mirror effect, so that radiation is pooled together in one direction injection.
(B) a high brightness laser Before the invention of artificial light in the high-voltage pulsed xenon lamps in the brightness of the highest comparable brightness of the sun, while the ruby laser laser brightness, can exceed tens of billions of times more xenon lamps. High brightness of the laser, it can illuminate distant objects。Ruby laser beam emitted to generate the illumination of the moon is about 0.02 lux (light-degree units), the color red, the laser spot visible.
(C) color extremely pure colors of light from the light wavelength of the decision. Launch of single-color light source as monochromatic light source, which emitted a single wavelength, but there is still a certain degree of distribution. If neon is only red emission wavelength range of the distribution is still 0.00001 nm, the red neon issued, if a careful identification of still includes dozens of red. Laser output light, the wavelength distribution is very narrow, so very pure color. To the output of red helium-neon laser, for example, the wavelength of light distribution can be narrow to 2 × 10 ^ -9 nano is the krypton red wavelength of light emitted distribution of two ten thousandths. Thus, the monochromatic nature of laser is far more than any kind of monochromatic light.
(D) a great the photon energy density is E = hf energy calculated, where h is Planck's constant, f is frequency. 。 From this, the higher the frequency, the higher the energy. 。 Laser frequency range of 3.846 * 10 ^ (14) Hz to 7.895 * 10 ^ (14) Hz. The electromagnetic spectrum can be broadly divided into: (1) radio waves - wavelengths from thousands of meters to 0.3 meters; (2) Microwave -- - the wavelength from 0.3 meters to 10 ^ -3; (3) infrared - wavelengths from 10 ^ -3 m to 7.8 × 10 ^ -7 m; (4) visible light - the wavelength from 780-380nm, just atoms or molecules the electronic state of motion changes of electromagnetic waves emitted; (5) ultraviolet - wavelengths from 3 × 10 ^ -7 m to 6 × 10 ^ -10 meters. (6) X-rays - wavelengths from 2 × 10 ^ -9 m to 6 × 10 ^ -12 m; (7) γ-rays - is the wavelength from 10 ^ -10 ~ 10 ^ -14 meters electromagnetic waves.