A kind of semiconductor chip and semiconductor laser

Abstract

The invention discloses a semiconductor chip and a semiconductor laser. The semiconductor chip is used to be arranged in the semiconductor laser, comprising: at least one gain region; the upper surface and the lower surface of each gain region are coated with electrodes; at least One of said electrodes is shaped to match the optical path of laser light resonating in said gain region. On the one hand, in the semiconductor chip provided by the embodiment of the present invention, the shape of the electrode is set to match the optical path of the laser resonating in the gain region, which can realize efficient overlapping of the gain region and the external cavity laser mode; on the other hand, the structure can realize the external cavity The gain length of the cavity is much longer than the gain length of the cavity and the maximum width of the amplification of spontaneous emission (ASE). At the same time, it can also cooperate with the coating technology to increase the laser threshold of the cavity, thereby suppressing the laser and ASE of the cavity, and realizing an external cavity semiconductor with high efficiency and high beam quality. Laser output. At the same time, there is no need to etch the ridges, which can reduce the cost and avoid the resulting modulation effect of the external cavity laser on the chip.

Description

technical field [0001] The invention relates to the technical field of laser devices, in particular to a semiconductor chip and a semiconductor laser. Background technique [0002] Semiconductor lasers use semiconductor materials as the gain medium, use electrons to transition between energy levels to emit light, and directly use parallel mirrors formed on the cleavage surface of semiconductor crystals to form a resonant cavity, and form optical oscillation feedback under electrical injection to generate light radiation amplification. Achieve laser output. Semiconductor lasers have the highest electro-optical conversion efficiency among current lasers, and the electro-optical conversion efficiency can reach 70%. And the semiconductor laser is also the laser with the widest wavelength range, the strongest adaptability and reliability, and the lowest mass production cost. However, due to the small size of the resonant cavity of the semiconductor laser (usually millimeter-sca...

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Problems solved by technology

However, the applicant found in the process of further research on the semiconductor laser with wide ridges that the structure of the semiconductor chip has a high impact on the electro-optical efficiency of the semiconductor laser. If the existing semiconductor chip is used, it is impossible to achieve an effective high beam. Quality external cavity laser output

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