Fiber Coupled Diode Laser semiconductor lasers are widely used in various fields, such as small size, good beam quality, long life and stable performance. They are mainly used as the source of fiber lasers and solid-state lasers. They can also be used directly in laser medical, Materials such as cladding, welding and other fields. The semiconductor lasers are also being developed with high power and high brightness. High-brightness semiconductor lasers have high optical power density, and the beam splitter is equally ideal for high power fiber lasers. Pump source. At present, the Fiber Coupled Diode Laser semiconductor laser structure is mainly composed of single-tube coupling lasers, multi-tube coupling lasers, mini bar and bar / array series, multi-tube coupling lasers because of its high reliability and become the mainstream of fiber lasers First, this article mainly introduces the technology and realization of realizing high-brightness semiconductor laser by multi-tube fiber coupling technology.
Multi-tube structure is the separation of the semiconductor laser beam emitted by shaping, rearrangement, combined after coupling into a single fiber, which can improve the laser output power. Since the discrete semiconductor laser chip must be mounted on a heat sink with a certain size, if the output beams of the plurality of semiconductor lasers are arranged and focusedly coupled directly, the volume of the combined beam is usually limited due to the limitation of the volume of each chip and its heat sink Large, it is difficult to obtain a small core high brightness fiber coupling output. In order to reduce the size of the space of the combined beam, we must take some measures. To this end, Kaipu Lin independent research and development of multi-tube coupling structure using ladder heat sink, focusing lens, coupled fiber and a unique installation, optical design simplifies the complexity of the structure, reducing the size of the components, greatly improving the semiconductor The output power of the laser,Fiber Coupled Diode Laser while ensuring a reasonable working temperature of the coupling point in the multi-tube coupling before the discrete semiconductor laser chip can be used for aging screening, thus ensuring the reliability of multi-tube coupling. Single tube random failure characteristics independent, compared to the bar, no interference effect of the noodles, single tube can also increase the durability of its replacement, with a high cost advantage.
Fiber coupling
In order to achieve high brightness, high power output can increase the number of simultaneous single-tube semiconductor lasers to ensure a higher output power, but the bundle after the laser beam coupling into a single fiber must also meet three conditions: (BPP, the product of the beam waist radius and the radius of the divergence angle) is smaller than that of the laser beam, and the beam diameter is smaller than the diameter of the optical fiber. Fiber beam parameter product.
In this paper, a multi-tube coupling structure and a high-brightness laser output method are introduced. In the field of high-brightness semiconductor lasers, multi-tube fiber coupling technology is widely used in 9xxnm, 793nm, 808nm wavelength lasers, Fiber lasers and thulium-doped fiber lasers and neodymium-doped solid-state lasers; 10W-200W different power levels can correspond to a variety of operating modes and power requirements of fiber laser applications. In the future, Kaiping will achieve higher brightness Fiber Coupled Diode Laser semiconductor lasers by increasing the polarization beam, multi-wavelength beam and other methods, and provide more products and services for high power fiber laser users.