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low power laser light sourceIt is a new type of light source, which has the characteristics of strong directionality, high brightness, monochromationality and coherence compared with ordinary light sources. These characteristics enable low power laser light sources for distance measurement, communication, collimation, orientation, drilling, cutting, welding, and other processing of refractory materials, as well as precision inspection and positioning, and can be used as length references and optical frequency standards.

low power laser light source

1. Strong directionality

Generally, ordinary light sources emit light to the entire development space, such as incandescent lamps.low power laser light sourceIt is light emitted by the laser in the direction of the optical axis, and therefore has strong directivity. The divergence angle of the laser beam (I. e., the angle between the two rays) is small, typically about 0.18 °, in the mrad range. Among them, the gas laser divergence angle zui is small (a few minutes), followed by solid, and the semiconductor laser divergence angle is very large, about a few degrees to a dozen degrees.

2. High brightness

The brightness of the light source is the light power emitted by the light source to a unit solid angle in a certain direction on a unit area w/(CM2 · SR).

The directionality of the laser beam is very strong, and the solid angle is very small, generally as small as 10-6 rad, while the solid angle of the ordinary light source is one million times larger than that of the laser. Therefore, the brightness of the laser light is a million times higher than that of ordinary light even if the power levels of both of them are not much different in unit area. In addition, some lasers have extremely short luminous working time and high optical output signal power requirements, such as giant pulsed ruby lasers, whose laser energy is highly developed and concentrated in space and time, making the brightness tens of billions of times higher than the sun's surface. The brightness of a nitrogen-neon laser with a power of 1 × 10-2W is about 106W/(cm2 · sr).

low power laser light source

3. Good monochromaticity

The wavelengths (or frequencies) of different colors of light are different, and each color of light is not a single wavelength, but has a range of wavelengths (or frequencies), called the spectral linewidth. For example, the wavelength range of red light is 650-760 nm, that is, the spectral line width ∆λ = 110 nm. The narrower the line width, the better the monochromaticness of the light. The good monochromatics in ordinary light is the light emitted by the isotope 86Kr lamp, whose wavelength is 605.7 nm. At low temperature, ∆λ = 0.0047 A.

4, good coherence

The coherence of light means that when two beams of light meet, the superposition of the waves emitted in the meeting area can form a relatively clear interference pattern (I. e. alternating light and dark stripes), or a stable beat signal can be received. The coherence of light waves from the same point at different times is called temporal coherence. At the same time, the coherence of light waves emitted from different points in space is called spatial coherence.

low power laser light sourceIt is formed by the action of stimulated radiation. The light waves that can be emitted by the luminescence technology center in various fields are completely inconsistent in the direction of propagation development, vibration research direction, frequency, phase, etc., so the spatial coherence and temporal coherence of the laser are good, and the spectral line width is narrow. The temporal spatial coherence of light is closely related to the spectral line width. The narrower the spectral line, the better the temporal coherence, and the optical path difference (I. e., the length of coherent data) that can affect the interferometric pattern is getting longer and longer.