Device and method for generating broadband noise source based on quantum dot micro-column laser
A broadband noise and laser technology, used in lasers, phonon exciters, laser components, etc., to achieve high-bandwidth effects
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[0088] A method of injecting a narrowband noise signal into a quantum dot laser to generate a broadband noise signal according to the present invention mainly includes the following steps:
[0089] (1) Fabrication of quantum dot microcolumn laser: firstly, a thick gallium arsenide cavity layer is formed by using Bragg reflectors distributed up and down, in which the upper Bragg reflector is made of AlAs / As The lower Bragg reflector is composed of aluminum arsenide / gallium arsenide mirror pairs with a logarithm between 20 and 40. A layer of quantum dots with an area density of ten to the ninth power per square centimeter is doped in the center of the cavity layer as a gain medium. Columnar structures with diameters between 7-15 μm were prepared by high-resolution electron beam lithography and plasma etching. The prepared micro-column samples are placed in a cryostat with a continuous flow temperature setting between T=22.00-30K and a temperature control accuracy of 0.01K. The ...
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