High-power mid-infrared quantum cascade laser based on all-fiber incoherent beam combining

Abstract

A high-power mid-infrared quantum cascade laser based on all-fiber incoherent beam combining comprises fiber coupled quantum cascade lasers, a fiber beam combiner and a laser output head. Output fibers of the fiber coupled quantum cascade lasers are respectively connected with a plurality of input fibers of the fiber beam combiner. An output fiber of the fiber beam combiner is connected with the laser output head. On one hand, the high-power mid-infrared quantum cascade laser based on all-fiber incoherent beam combining provided by the invention can achieve high output power (such as hundred watts), and the output power can be increased by one order of magnitude compared with the output power of the existing mid-infrared band quantum cascade laser. On the other hand, the laser realizes 'flexible' output of fibers, and the whole system has advantages such as simple structure and stable and reliable performance.

Description

technical field [0001] The invention belongs to the technical field of optical fibers and lasers, and in particular relates to a high-power mid-infrared quantum cascade laser based on all-fiber incoherent beam combining. Background technique [0002] The invention of quantum cascade laser is a milestone development in the field of semiconductor lasers, creating a new field of mid-to-far infrared semiconductor lasers. There are very few semiconductor lasers with operating wavelengths in the mid-infrared band, while quantum cascade lasers work precisely in the mid-infrared region (2.75-25 μm), and the wavelength is tunable. The current main applications of quantum cascade lasers are gas detection, infrared countermeasures and terahertz communication, especially in the mid-wave infrared 3-5μm band, which has basically reached the level of practicality. The output power of cascaded lasers is very difficult. As the most direct way to obtain high power output, laser beam combini...

AI Technical Summary

Problems solved by technology

Various beam combining technologies currently applied to quantum cascade lasers (coherent beam combining, spectral beam combining, waveguide beam combining, polarization beam combining, etc.) all rely on various space devices, the system structure is complex, and there is a big gap from practicality

[0003] The Chinese invention patent application with the application number 201811482773.2 and the title of the invention "A Beam Combining System Based on Quantum Cascade Lasers" discloses a quantum cascade laser beam combining scheme based on polarization beam combining technology, but its disadvantage is that only Limited to beam combining in space, limited by the current packaging process of quantum cascade lasers, it is impossible to obtain high-power (such as hundreds of watts) mid-infrared lasers

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