- NLO Crystals 8/7/2024 NLO(Nonlinear) Crystals, means the crystals that can generate nonlinear optical effect from laser beam or electricity, magnetic field and strain field. Highly recommended NLO Crystals list from Yutai Optics:LBO, BBO, KTP, KTA, KDP, LiNbO3, MgO: LiNbO3. LBO (Lithium Triborate) crystals are excellent nonlinear crystal. For frequency doubling(SHG), tripling(THG) of Nd: YAG, Nd: YLF, Nd: Y...
- Fresnel lens 7/24/2024 Fresnel lens, also known as the threaded lens, mostly by the polyolefin material injection pressure and into the sheet, there are also made of glass, the surface of the lens on one side of the surface for the optical surface, the other side of the recorded from small to large concentric circles, it is based on the texture of the interference and interference of light and the relative sensitivity...
- Optical fiber protective window for laser 6/19/2024 The laser window is a piece of optical glass that is ground and polished to form two parallel surfaces, which can provide high transmittance for certain wavelengths of light. Laser windows can be used in the field of laser transmission and laser safety. They are usually used as protection devices for electronic sensors, optical glass lenses and laser processing heads. Laser wi...
- Numerical aperture 6/10/2024 Definition: Abbreviation: NA The sine of the maximum angle of incidence for some optical devices, or the sine of the acceptance angle for a waveguide or fiber. Numerical aperture (NA) has two different meanings, one for fiber optics and one for imaging fibers. Numerical aperture of a fiber or waveguide In a ray diagram, a beam can be viewed as propagating in air and incident on the core of...
- Focal length 6/2/2024 Definition: A measure of how well an optical system focuses or defocuses light. Many types of optical systems (e.g., microscope objectives and curved laser mirrors) can focus or defocus light, and focal length is a quantity that quantifies these effects. The simplest case is a thin lens (Figure 1a). If the light entering the lens is a collimated beam, the beam will be focused after passing th...
- Polarization of laser emission 5/26/2024 Definition: Definition: The direction of electric field vibration of the laser beam. In most cases, the emitted light from a laser is polarized. Usually linearly polarized, that is, the electric field oscillates in a specific direction perpendicular to the propagation direction of the laser beam. . Some lasers (for example, fiber lasers) do not produce linearly polarized light, but other stable...
- Return loss 5/20/2024 Definition: A measure of how much reflected light is attenuated. Return loss (or reflection loss) of an optical device (or combination of devices) represents the degree to which the returned optical power is reduced compared to the light incident on the device. Typically, return loss is characterized in decibels. For example, if the return loss is 30dB, then the returned light is 1/1000 of the...
- Infrared light 5/12/2024 Definition: Invisible light with wavelengths between 750nm and 1mm. The wavelength of infrared light is greater than 700-800nm, which is the upper limit of the wavelength of visible light. The boundary between the two is not very clear, and the responsivity of the eye decreases very slowly in this area. Although the responsivity is already very low at 700nm, it can still be seen at a wavelengt...
- Photons 5/5/2024 Some key properties of photons The propagation of light (in free space or in a waveguide) is actually the propagation of waves. The amplitude of the quantum mechanical field at a certain point at a certain time is the superposition of all possible paths of light. Superposition may interfere constructively or destructively, which is the basis of optical interference effects. It is difficult for pu...
- Optical density 4/28/2024 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 chain...
- Velocity of light 4/21/2024 Definition: The speed of a particle is a very simple and clear concept, but the speed of light (and other wave phenomena) is a very complex issue. There are several different concepts of speed (especially when light travels through a medium), and they have different numerical values: Phase velocity is the speed at which the phase wavefront propagates. The group velocity is the speed at which ...
- Gouy phase shift 4/14/2024 Definition: Additional phase shift produced during propagation of a focused Gaussian beam. (Often incorrectly written as "Guoy Phase Shift") Gaussian beams produce an additional phase shift in the direction of propagation, which is different from the phase shift produced by plane waves of the same frequency. This different phase shift is called the Guyi phase shift: where zR is the Rayleigh...
- Beam parameter product 4/6/2024 Definition: Abbreviation: BPP Product of beam radius at focus and far-field divergence angle. The beam parameter product (BPP) of a laser beam is the product of the beam radius (at the beam waist) and the half divergence angle (far field). Commonly used units are mm mrad (millimeters times milliradians). BPP is usually used to characterize the beam quality of laser beams: the greater the beam ...
- Fluence 3/31/2024 Definition: Light energy per unit area. In fundamental physics a flux is defined as the time-integrated quantity of some radiation or particle flow. In optics, the luminous flux F of a light pulse is defined as the light energy delivered per unit area. Its most common unit is J/cm2. Like light intensity, luminous flux is also a position-dependent value. For lasers, the luminous flux is usuall...
- Spectrometers 3/24/2024 Definition: A device for recording spectra. A spectrometer is an instrument used to record the spectrum of a light source. That is, it measures the power spectral density (PSD) of light as a function of wavelength or frequency. Not all spectrometers give calibrated PSDs; often the intensity is not calibrated and the calibration factor (responsivity) is wavelength dependent. Using the spectral...
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