- Laser beams 12/17/2023 Definition: A beam of light traveling in one direction. In most cases, the light radiated by a laser is a laser beam. That is, the radiation beam propagates in a specific direction, and the optical power is concentrated on a small area of several square millimeters. The laser beam is very close to the Gaussian beam. The cross-section of the Gaussian beam intensity can be described by the Gaus...
- Optical Spectrum 12/11/2023 The spectrum (or radiation spectrum) of a light source or some light beam contains information about the distribution of energy and power in different wavelengths. It is usually expressed in the form of a graph, giving a curve of the power spectral density versus wavelength or optical power. Figure 1 is an example, showing the numerical simulation spectrum of a supercontinuum light source. The spe...
- Types and applications of waveplates 12/4/2023 The most common waveplates are quarter-waveplates (λ/4 plates) and half-waveplates (λ/2 plates), in which the phase retardation differences in the two linear polarization directions are π/2 and π respectively, and the corresponding phase propagation The distances are λ/4 and λ/2 respectively. Here are some important conclusions: If the beam is linearly polarized and the polarization direction ...
- Some basic properties of mirrors 11/28/2023 Mirrors have some basic properties: Reflectance is the percentage of reflected light power. Usually it is related to wavelength and angle of incidence, but also to polarization direction. Reflection phase is the phase shift of reflected light, that is, the phase change of light before and after light reflection. Phase shift is related to wavelength and polarization direction. If the phase...
- Dispersion 11/23/2023 Definition: The effect of light frequency or propagation mode on phase velocity in a medium. There are many types of dispersion, which all involve the phase velocity or phase delay of light in a medium or device and are related to certain parameters: Chromatic-dispersion, phase velocity is related to light frequency or wavelength. Possibly from frequency dependence of refractive index, or ...
- Optical density 11/23/2023 Definition: Abbreviation: OD Logarithmic value of power attenuation. Optical density is generally considered to refer to the absolute value of the base 10 logarithm of the optical attenuator power transmission factor. For example, an optical density of 3 represents a power attenuation factor of 103 = 1000. The corresponding attenuation coefficient is 30 dB. If several attenuators form a ...
- Chromatic dispersion effect of optical components 11/9/2023 Chromatic dispersion can also be defined as the dispersion in the optical element rather than in the medium. At this time, it is necessary to perform Taylor expansion on the total phase delay of the component (rather than on the wave number, that is, the phase delay per unit length), and then obtain the total group delay dispersion (units are seconds squared), instead of unit length as mentioned a...
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