A laser diode chip is a semiconductor-based laser that consists of a P-N structure and is powered by current. The laser diode package is a complete device that is assembled and packaged together in a sealed package housing to form a semiconductor laser chip that emits coherent light, a monitoring photodiode chip for feedback control of power output, a temperature sensor chip for temperature monitoring, or an optical lens for laser collimation.
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
A pump laser is a laser used to provide an excitation light source for a fiber laser or fiber amplifier. The emission wavelength of a 980nm pump laser is approximately 980 nanometers (nm).
ASE broadband light generated by erbium-doped fiber is amplified spontaneous emission light generated by short-wavelength laser pumping erbium-doped fiber. As shown in the following diagram, the pumped rare earth ions transition between upper and lower energy levels to generate spontaneous emission light, which is amplified in the stimulated emission process. This process is repeated continuously, and even a fairly high output power can be achieved under sufficient pumping conditions. (ASE=Amplified Spontaneous Emission, amplified spontaneous emission light)
For polarization-maintaining (PM) optical fiber, assuming that the polarization direction of the input linearly polarized light is in the middle of the fast axis and the slow axis, it can be decomposed into two orthogonal polarization components. As shown in the figure below, the two light waves initially have the same phase, but because the refractive index of the slow axis is greater than that of the fast axis, their phase difference will increase linearly with the propagation distance.
Depending on the active region material, the band gap width of the semiconductor material of the blue light semiconductor laser varies, so the semiconductor laser can emit light of different colors. The active region material of the blue light semiconductor laser is GaN or InGaN.
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