Microcavity laser array and visible light photometer including it

Abstract

The invention discloses a micro-cavity laser array comprising a substrate layer, a pumping layer, a gain layer and a packaging layer which are arranged from the bottom to the top in turn. The gain layer is internally provided with multiple DBR micro-cavity lasers which are arranged in an array and emit light in parallel. The pumping layer is used for being connected with pumping sources which input pumping light to the pumping layer. The invention also discloses a visible light photometer comprising the micro-cavity laser array. Compared with the micro-cavity laser array in the prior art, contradiction between high resolution, high efficiency and high manufacturing cost can be effectively balanced so that the micro-cavity laser array is enabled to have the advantages of high resolution and high efficiency and also have the advantage of low manufacturing cost.

Description

technical field [0001] The invention relates to the field of spectrum analysis, in particular to a microcavity laser array and a visible light photometer including it. Background technique [0002] The UV / Vis absorption spectrum is based on the absorption spectrum generated by intramolecular electronic transitions. When radiation is irradiated on matter, photons and molecules collide with each other, and if the energy of the photon is equal to the energy difference between a lower energy level and a higher energy level in the molecule, absorption will occur. When molecules selectively absorb photons, an absorption spectrum is produced. The position of the absorption spectrum, that is, the wavelength, is determined by the energy difference between the transition energy levels that generate the band, reflecting the distribution of energy levels in the molecule. Through the characteristic absorption spectrum of the substance, the substance can be quantitatively detected. Sin...

AI Technical Summary

Problems solved by technology

The advantages of this mechanical scanning monochromator are high precision, good monochromaticity, and relatively low cost. However, due to the limited scanning speed of the mechanical point, and the detector can only collect data of one wavelength at a time, the scanning rate can only be up to 30nm / min

Each test takes a long time, usually it takes several minutes to complete the test of a sample

In addition, the reciprocating motion of the motor or screw will inevitably bring about mechanical friction errors and backlash errors, resulting in low wavelength accuracy and reduced wavelength repeatability.

Chinese patent CN 101788340A provides a wavelength scanning device. By measuring the movement of the grating with high precision, the operating efficiency and wavelength accuracy of this monochromator work mode are improved to a certain extent, but it still takes tens of seconds The measurement time does not meet the requirements of real-time measurement, and the operation difficulty and instrument cost are also greatly increased

Chinese patent CN202119535U proposes to use multiple light-emitting diodes as light sources, covering the visible band of 380nm-780nm, and to use the better monochromaticity of light-emitting diodes for measurement. Very low, not much market potential

However, the wavelength adjustable range of a single laser on the market is limited, and several lasers are required to cover a certain wavelength band, which brings problems of high cost and complex system, and is not practical.

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