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low power laser light sourceAn electric light source that uses electronically excited particles to emit light under the influence of stimulated radiation. It is a coherent light source. Since the invention of the ruby laser by T.H. Maiman in Theodore in 1960, there have been hundreds of different laser sources with output wavelengths ranging from short-wave ultraviolet to far-infrared.

low power laser light source

Laser sources can be divided into solid laser sources (crystals and neodymium glass), gas laser sources (including atoms, ions, molecules, excimer), liquid laser sources (including organic dyes, inorganic liquids, chelates) and semiconductor laser sources according to their working substances.

The color of the laser depends on the wavelength of the laser, and the wavelength depends on the active material that emits the laser, that is, the material that can produce the laser after being affected. The excited material includes a solid, a semiconductor, a gas, and the like. For example, a red laser beam can be generated when a ruby is excited; a blue-green laser beam can be generated when an argon gas is excited; an infrared laser can be emitted when a semiconductor is excited, invisible to the naked eye; a laser with a wavelength of 10.6μm can be emitted when CO2 is excited, invisible to the naked eye, and so on.

low power laser light sourceWhat is the difference with ordinary light sources? Let's take a brief analysis.

Low-power laser light sources are high-energy beams, known as relatively fast knives, precise rulers, and bright light. Compared with ordinary light sources, lasers have four basic characteristics in China.

1. High directivity: refers to the divergence angle of the beam is small, that is, the directivity of the laser is extremely high, and the ordinary light source emits light in all directions. As shown in the picture, the light from the flashlight bulb is everywhere. In order to make the emitted light propagate in one direction, the light source needs to be equipped with a certain condenser device. For example, the headlights and searchlights of automobiles are equipped with concave mirrors and convex lenses with condensing technology, so that the light can be collected and used, and can be emitted in a development direction.

2. High brightness: The brightness of the light source refers to the light power of the light emitting unit within the solid angle range of a given direction. Before the invention of the laser, the brightness of the high-voltage pulsed xenon lamp was very high in the artificial light source, which was equivalent to the brightness of the sun, and the brightness of the laser was much higher than that of the sun. A ruby laser, for example, is about 10 billion times brighter than the sun.

Good monochromaticity: The wavelength distribution of the light output by the laser is very narrow, so the color is extremely pure. For example, the main distribution research range of the red Chinese laser wavelength emitted by the He-Ne laser is μm level, which is 2/10000 of the distribution influence range of the red wavelength emitted by the krypton lamp. It can be seen that the monochromaticity of the laser beam is far beyond any kind of monochromatic light source.

4. High coherence: This refers to the phase relationship of the various parts of the light wave. Due to the high directivity and high monochromaticness of the laser, a stable phase relationship between the beam and each point is inevitable during the propagation process, thereby forming stable interference fringes.

low power laser light sourceThe above four characteristics enable it to focus accurately and obtain a higher power density, which is several orders of magnitude higher than the general cutting heat source. Laser processing brings high energy quality that traditional processing does not have, so it is widely used, and material processing is an important application field.