Vertical external cavity surface emitting laser

Abstract

The invention discloses a vertical external cavity surface emitting laser. The vertical external cavity surface emitting laser comprises a collimating lens; a laser emitting chip which is located at the first side of the collimating lens, the laser emitting chip comprises a first electrode provided with a first light outlet, a first contact layer, an active layer, a second contact layer and a second electrode provided with a second light outlet sequentially stacked from bottom to top, and the first light outlet being located on the focal plane of the first side of the collimating lens; a diffraction grating which is positioned at the second side of the collimating lens, and the first side being opposite to the second side; and a first top cavity mirror which is positioned on one side, faraway from the collimating lens, of the laser emitting chip, or a second top cavity mirror which is positioned in the laser emitting chip. The diffraction grating has a very wide tuning range and can provide flat first-order diffraction efficiency, so that the gain spectrum range of the active layer of the laser emitting chip is fully covered, the wavelength tuning range is the gain spectrum range,the wavelength tuning range is widened, and the vertical outer resonant cavity enables the cavity length of the gain resonant cavity to be increased and the spectral line width to be narrowed.

Description

technical field [0001] The present application relates to the technical field of semiconductor lasers, in particular to a vertical external cavity surface emitting laser. Background technique [0002] Vertical-External-Cavity Surface-Emitting Laser (VECSEL) is a small semiconductor laser that emits laser light perpendicular to the surface of the semiconductor wafer. During the use of vertical external cavity surface emitting lasers, it is usually necessary to quickly tune the wavelength. At present, the principle of cavity length tuning is widely used to tune the vertical external cavity surface emitting laser. The tuning of the wavelength is by adjusting the distance between the external cavity mirror and the chip. The tuning range is small, and its tuning range is smaller than the gain spectrum range of the emitting chip. The wavelength tuning range is the actual cavity length tuning range of the external cavity mirror and the chip. Due to the limitation of the cavity len...

AI Technical Summary

Problems solved by technology

At present, the principle of cavity length tuning is widely used to tune the vertical external cavity surface emitting laser. The tuning of the wavelength is by adjusting the distance between the external cavity mirror and the chip. The tuning range is small, and its tuning range is smaller than the gain spectrum range of the emitting chip. The wavelength tuning range is the actual cavity length tuning range of the external cavity mirror and the chip. Due to the limitation of the cavity length tuning range, the wavelength tuning range is limited; at the same time, because the resonant external cavity tuning range is very short, the spectral linewidth is still wide

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