The full name of VCESL is a vertical cavity surface emitting laser, which is a semiconductor laser structure in which an optical resonant cavity is formed in the direction perpendicular to the semiconductor epitaxial wafer and the laser beam emitted is perpendicular to the surface of the substrate. Compared with LEDs and edge-emitting lasers EEL, VCSELs are superior in terms of...

The fiber cut-off wavelength is to ensure that only one mode exists in the fiber. One of the main transmission characteristics of single-mode fiber is the cut-off wavelength, which is of great significance for fiber optic cable manufacturers and users of fiber optic cables to design and use fiber optic transmission systems.

Laser sensors are sensors that use laser technology to measure. It consists of a laser, a laser detector and a measuring circuit. Laser sensor is a new type of measuring instrument. Its advantages are that it can realize non-contact long-distance measurement, fast speed, high precision, large range, strong anti-light and electrical interference ability, etc.

A semiconductor optical amplifier (SOA), also known as a laser amplifier, is an active medium of a semiconductor laser. In other words, an SOA is a laser diode without or with very low optical feedback. An electric current is externally applied to the laser device that excites electrons in the active region. When photons travel through the active region it can cause these elect...

FBG optical sensor, fiber Bragg grating sensor, is a kind of optical fiber sensor with the highest frequency and widest range. This sensor can change the wavelength of the reflected light wave according to the change of ambient temperature and/or strain. Fiber Bragg gratings use holographic interferometry or phase masking to expose a small section of light-sensitive fiber to a ...

FBG optical sensor, fiber Bragg grating sensor, is a kind of optical fiber sensor with the highest frequency and widest range. This sensor can change the wavelength of the reflected light wave according to the change of ambient temperature and/or strain. Fiber Bragg gratings use holographic interferometry or phase masking to expose a small section of light-sensitive fiber to a ...

Since the invention of the world‘s first semiconductor laser in 1962, the semiconductor laser has undergone tremendous changes, greatly promoting the development of other science and technology, and is considered to be one of the greatest human inventions in the twentieth century. In the past ten years, semiconductor lasers have developed more rapidly and have become the faste...

Compared with traditional technologies, the advantages of fiber lasers in beam quality, depth of focus and dynamic parameter adjustment performance have been fully recognized. Coupled with the advantages of electro-optical conversion efficiency, process versatility, reliability and cost, the application level of fiber lasers in medical device manufacturing (especially in fine c...