Recently, the laser light scattering has been developing quickly on the basis of light scattering theory. The former is now closely related to some high-end technologies. Therefore it is necessary to get some knowledge about it. In order to understand the laser light scattering, the author will start from something simpler–the light scattering.
Light scattering can be thought of as the deflection of a ray from a straight path. To be more specific, when a beam of light passes through an inhomogeneous medium, it can be observed in all directions. A typical example of light scattering is that the clear sky is blue at noon and red at sunset–because the kind of light being scattered is different, the color of sky is also different.
2.Laser light scattering
After the introduction of light scattering, we start to focus on the next question–what is the laser light scattering.
Unlike light scattering, the source of laser light scattering is laser light, not natural light. Therefore, laser controllability makes laser light scattering technology more widely used. Nowadays, laser light scattering can be used in biomedical, colloid science, polymer analysis and other fields.
The laser light scattering can be divided into two groups, static light scattering(SLS) and dynamic light scattering(DLS).
When a monochromatic, correlated laser beam strikes a non-absorbing polymer dilute solution along the incident direction, the molecules in the beam radiate electron waves in all directions, and this electron wave becomes a secondary light wave source, that is, scattered light. If the molecule is stationary, the scattered light and incident light have the same frequency and are said to be SLS, which is also called elastic light scattering.
On the contrary, if the molecule is dynamic, due to the random Brownian motion of the particles, the frequency of the scattered light will increase or decrease slightly as the particle moves, making the spectrum of the scattered light wider. This technology is called DLS. Because of the very small relative movement of the scattered light, the dynamic light scattering is also called quasi-elastic light scattering.
Under natural lighting conditions, sometimes only scattered light illumination, only a single direct light illumination is rare, mostly mixed with direct and scattered light. The characteristic of scattered light is that the light is soft, with no obvious projection, which is good for our eyesight. Similarly, in our daily life, choosing a lamp with soft light is of great importance. Buying a reliable lamp is a far-reaching decision for the whole family.
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