980nm 600mW pump laser diode Manufacturers

A femtosecond laser is an "ultrashort pulse light" generating device that emits light only for an ultrashort time of about one-gigasecond. Fei is the abbreviation of Femto, the prefix of the International System of Units, and 1 femtosecond = 1×10^-15 seconds. The so-called pulsed light emits light only for an instant. The light-emitting time of the flash of a camera is about 1 microsecond, so the ultra-short pulse light of femtosecond only emits light for about one billionth of its time. As we all know, the speed of light is 300,000 kilometers per second (7 and a half circles around the earth in 1 second) at an unparalleled speed, but in 1 femtosecond, even light only advances by 0.3 microns.

The polarization characteristics of light are a description of the vibration direction of the electric field vector of light. There are five polarization states in total: completely unpolarized light, partially polarized light, linearly polarized light, elliptically polarized light, and circularly polarized light

Laser-a device capable of emitting laser light. The first microwave quantum amplifier was made in 1954, and a highly coherent microwave beam was obtained. In 1958, A.L. Xiaoluo and C.H. Towns extended the principle of microwave quantum amplifier to the optical frequency range. In 1960, T.H. Mayman and others made the first ruby laser. In 1961, A. Jia Wen and others made a helium-neon laser. In 1962, R.N. Hall and others created a gallium arsenide semiconductor laser. In the future, there will be more and more types of lasers. According to the working medium, lasers can be divided into four categories: gas lasers, solid lasers, semiconductor lasers and dye lasers. Free electron lasers have also been developed recently. High-power lasers are usually pulsed output.

Erbium doped fiber is the core component of PA amplifiers, which amplifies optical signals by doping the rare earth element erbium (Er) into the fiber core.

The basic components of a laser can be divided into three parts: a pump source (which provides energy to achieve population inversion in the working medium); a working medium (which has a suitable energy level structure that enables population inversion under the action of the pump, allowing electrons to transition from high energy levels to the lower level and release energy in the form of photons); and a resonant cavity.