Fiber is an important component of fiber coupled lasers, responsible for transmitting laser beams. Fiber optic is made of glass or plastic and has advantages such as low loss, high transmittance, and resistance to electromagnetic interference. During fiber optic transmission, the energy loss of the beam mainly comes from the absorption and scattering of the fiber. In order to reduce transmission loss, optical fibers with low loss characteristics, such as quartz fibers, are usually chosen.
The coupling mechanism of fiber coupled lasers mainly depends on the interaction between optical lenses and fibers. The lens can focus the beam of light from the laser diode onto the core of the fiber, thereby achieving effective transmission of optical signals. In order to achieve efficient coupling, it is necessary to select appropriate lens and fiber combinations, and precisely adjust the distance and angle between them.
Fiber end reflection refers to the reflection of a beam of light at the fiber end face. When a beam of light is incident at a certain angle on the end face of the fiber, some of the beam will reflect back, forming end face reflection. End face reflection can have a negative impact on beam quality, such as mode noise and polarization distortion. In order to reduce the impact of end face reflection, some technical measures are usually adopted, such as end face tilting and coating treatment
5、 Beam quality
The beam quality of fiber coupled lasers mainly depends on factors such as beam transmission loss, mode, and polarization. The lower the transmission loss, the higher the transmission efficiency of the beam in the optical fiber; The purer the mode, the smaller the divergence angle of the beam; The more stable the polarization, the better the quality of the beam. In order to improve the beam quality, methods such as low loss fiber, optimizing fiber structure, and controlling polarization can be used.
6、 Temperature stability
Temperature has a significant impact on the stability of fiber coupled lasers. As the temperature changes, the refractive index and conductivity of the optical fiber will change, which in turn affects the quality and output power of the beam. In order to improve the temperature stability of the equipment, some temperature control measures can be adopted, such as heaters, radiators, and temperature sensors. In addition, the ability to resist temperature changes can also be improved by optimizing the material and structural design of optical components.
7、 Beam pointing stability
Beam pointing stability is one of the important indicators for measuring the performance of fiber coupled lasers. Unstable beam pointing can lead to uneven distribution of laser energy, reducing the accuracy and efficiency of laser processing. In order to maintain the stability of the beam, some measures can be taken, such as optical stabilization systems, closed-loop control systems, etc. In addition, beam pointing stability can be improved by optimizing the shape and position of optical components
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