The laser is polarized light, the laser is monochromatic linear polarized light, and infrared polarized light is wide spectrum elliptically polarized light, which is similar to the composite application of low power laser in different bands.
When the electron in the atom absorbs the energy, it transits from the low energy level to the high energy level and then falls back from the high energy level to the low energy level, the released energy is released in the form of photons. The optical properties of photons in the induced (excited) photon beam (laser) are highly consistent. This makes the laser better monochromatic, bright, and directional than the ordinary light sources.
The asymmetry of vibration direction to propagation direction is called polarization, which is the most obvious sign that S-wave is different from other P-waves. Lightwave is an electromagnetic wave, so the propagation direction of a light wave is the propagation direction of the electromagnetic wave.
The polarization effect is an important characteristic of scattered light. The results show that the use of polarization information is feasible and effective.
In atmospheric optics and ocean optics, people have been studying the scattering of polarized light in turbid media for a long time, and a series of achievements have been made. According to the different polarization characteristics of medium scattering and target reflected light, polarization technology can be used to eliminate the interference of particle scattering light, so as to improve the clarity of underwater images.
In recent years, with the continuous heating up of biological tissue optics, biological tissue optics has become more and more popular People pay more and more attention to the value of polarizing information in weaving. The characteristics of the scattering medium can be obtained by changing the polarization state of incident light and then analyzing the polarization characteristics of outgoing light. The polarization parameters of biological tissue before and after pathological changes can be measured, compared, and analyzed by using the polarization method, which provides a new information analysis method for medical diagnosis. Polarization detection is especially suitable for birefringence and surface optical rotation tissues, and can be used to arrange the polarization parameters In addition to the specular reflection of tissue interface, polarization imaging technology has been applied to biomedical imaging abroad. Polarization-sensitive optical OCT, polarization differential imaging, polarization gate, and other technologies can achieve unique results in the field of imaging.
In this paper, the application prospect of polarized laser is illustrated by underwater imaging and medical applications.