The so-called single emitter is what we often call "laser chip". Its manufacturing process is the same as that of semiconductor chip, which goes through a series of processes such as silicon wafer manufacturing, IC design, IC manufacturing, IC sealing and testing. The final chip is called a single diode laser. The laser bar can be regarded as a single laser bar formed by multiple single semiconductor emitters side by side, which is called a bar. In essence, it is formed by building a series of single semiconductor laser emitters on the same substrate, which can also be called a linear array laser. Simply understood, multiple single emitters are arranged into one bar, and one bar can be divided into multiple single emitters.
The single laser emitter has only one luminous point, which is easy for fiber coupling. Therefore, it is commonly used as the pump source of fiber laser (mostly medium and low power), which can effectively reduce the mutual influence of thermal effects, and is easy to repair, maintain and replace. Moreover, the drive power source with high voltage and low current has simple structure and low cost; The laser bar has higher luminous power due to its many luminous points, so it is often used as the pump source or direct luminescence of high-power fiber lasers and all solid state lasers. It is also widely used in medical, military and other fields. At present, the maximum power of a single laser tube in China can reach 20W, while the laser bar can achieve 300W or higher power output.
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