Narrow linewidth semiconductor lasers typically have a spectral linewidth in the range of 1kHz to 10kHz, and are mainly used in coherent communication, fiber optic sensing, laser radar, and other fields. Narrow linewidth semiconductor lasers are based on the band structure of semiconductor materials and achieve laser radiation through the interaction between photons and electrons. When semiconductor materials are excited by a pump light source, electrons transition from the valence band to the conduction band to form electron hole pairs. These carriers recombine in the resonant cavity and release photons, forming laser output.
The band structure based on semiconductor materials and the interaction between photons and electrons. When semiconductor materials are excited by a pump light source, electrons transition from the valence band to the conduction band, forming electron hole pairs. These electron hole pairs recombine within the resonant cavity and release photons, forming laser radiation. By optimizing the resonant cavity structure, such as using a single longitudinal mode laser cavity, increasing the cavity length, and controlling the pumping conditions, single frequency oscillation and narrow linewidth output can be achieved.
Core applications
Coherent communication: By increasing the complexity of transmission rate and modulation format, inter satellite optical communication and distributed sensing systems can be achieved.
Fiber optic sensing: used for high-precision spectral analysis and gravitational wave detection.
Lidar: Achieving long-range target detection through coherence enhancement (such as coherent reception of reflected light from 200 meters away).
feature
Good monochromaticity: Laser has good monochromaticity and high spectral purity, which is conducive to improving signal transmission quality and spectral analysis accuracy.
Strong coherence: Laser beams have strong coherence and are suitable for fields such as interferometric measurement and fiber optic sensing that require high coherence.
High stability: The output optical signal is stable and can meet the needs of high-precision measurement and communication fields.
Flexible and adjustable: By adjusting the parameters of the resonant cavity and excitation source, flexible scanning and modulation of laser frequency can be achieved to meet the needs of different application scenarios.