Analysis of laser working principle of fiber laser cutting machine
Everyone should know that the laser used by fiber laser cutting machine is a fiber laser. So, does anyone know how the laser of the fiber laser cutting machine works? Today, editor who has focused on laser cutting machines for many years is here to popularize it for everyone.
First, let’s take a look at what a fiber laser is. Fiber laser refers to a laser that uses rare-earth element-doped glass fiber as the gain medium. The pump light is used to irradiate the rare-earth element-doped glass fiber pump source to promote the rare-earth ion to absorb the photon and the excited radiation is the same frequency as the incident photon , The coherent light in the propagation direction and the vibration direction is amplified by light to produce high-energy laser light.
Fiber lasers have a wide range of applications, including material processing, communications, medical beauty, scientific research and military, instrumentation and sensors; as the largest field of laser applications, material processing has developed laser marking, cutting, welding, cladding, cleaning, and surface processing and other application technologies, and laser cutting has become the most widely used field of laser technology.
Everyone should know that the laser used by fiber laser cutting machine is a fiber laser. So, does anyone know how the laser of the fiber laser cutting machine works? Today, a small editor who has focused on laser cutting machines for many years is here to popularize it for everyone.
First, let’s take a look at what a fiber laser is. Fiber laser refers to a laser that uses rare-earth element-doped glass fiber as the gain medium. The pump light is used to irradiate the rare-earth element-doped glass fiber pump source to promote the rare-earth ion to absorb the photon and the excited radiation is the same frequency as the incident photon , The coherent light in the propagation direction and the vibration direction is amplified by light to produce high-energy laser light.
Fiber lasers have a wide range of applications, including material processing, communications, medical beauty, scientific research and military, instrumentation and sensors; as the largest field of laser applications, material processing has developed laser marking, cutting, welding, cladding, cleaning, and surface Processing and other application technologies, and laser cutting has become the most widely used field of laser technology.
Since the working medium used by the fiber laser is in the form of an optical fiber, its characteristics are affected by the transition properties of the optical fiber. The pump light entering the fiber generally has multiple modes, while the signal photoelectric may have multiple modes. Different pump modes have different effects on different signal modes, making the analysis of fiber lasers and amplifiers more complicated. In this case, you have to resort to numerical calculations.
The doping distribution in the fiber also has a great impact on the fiber laser. In order to make the medium have gain characteristics, working ions (ie impurities) are doped into the fiber. In general, working ions are evenly distributed in the core. However, the distribution of pump light of different modes in the fiber is non-uniform. Therefore, in order to improve the pumping efficiency, the ion distribution and the pumping energy distribution should be as close as possible. When analyzing fiber lasers, in addition to the general principles of lasers discussed above, they must also consider their own characteristics, introduce different models and adopt special analysis methods to achieve good analysis results. Like traditional solid-state and gas lasers, fiber lasers are also composed of three basic elements: pump source, gain medium, and resonator. The pump source generally uses high-power semiconductor lasers, and the gain medium is rare-earth-doped fiber or ordinary nonlinear fiber. The resonant cavity can be composed of optical feedback elements such as fiber gratings to form various linear resonant cavities, or couplers can be used to form various ring-shaped cavities,resonant cavity. The pump light is coupled into the gain fiber through an appropriate optical system, and the gain fiber forms a population inversion or nonlinear gain after absorbing the pump light and generates spontaneous emission. The generated spontaneous emission light undergoes excitation amplification and mode selection of the resonant cavity to form a stable laser output
