External cavity quantum cascade laser testing apparatus and method

By optimizing the structure and parameters of the external cavity quantum cascade laser testing device, the problems of insufficient output performance and testing accuracy have been solved, realizing efficient mid- and far-infrared spectral testing, which is suitable for fields such as environmental monitoring, chemical analysis, and medical diagnosis.

CN122385143APending Publication Date: 2026-07-14INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
Filing Date
2025-01-14
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

The output performance and testing accuracy of existing external cavity quantum cascade lasers are insufficient, making it difficult to meet the application requirements in the field of mid- and far-infrared spectroscopy.

Method used

An external cavity quantum cascade laser testing device was designed, including a gain chip, a diffraction grating, a mirror, a lens, and an infrared spectrometer. The beam propagation direction and feedback intensity were optimized, and the Norton-Beer strong apodization function was used for testing. Combined with fixture control of the gain chip temperature, collimation and lens position adjustment were achieved, and the test parameters were optimized to improve measurement accuracy.

Benefits of technology

It significantly improves the output power and testing accuracy of external cavity quantum cascade lasers, reduces laser linewidth, improves side-mode suppression ratio and linewidth accuracy, and enhances the flexibility and tunability of the device, making it suitable for applications in the field of mid- and far-infrared spectroscopy.

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Abstract

The disclosure provides an external cavity quantum cascade laser testing device and method, the device comprising: an external cavity quantum cascade laser, comprising: a gain chip for generating a first light beam; a diffraction grating for diffracting the first light beam to obtain a first diffracted light beam and a second diffracted light beam, the first diffracted light beam propagating to the gain chip along a second direction for increasing the resonance strength of the gain chip; an infrared spectrometer for testing the second diffracted light beam to obtain a test result; wherein the side of the gain chip away from the diffraction grating is a back cavity surface, the side of the gain chip close to the diffraction grating is a front cavity surface, the back cavity surface and the front cavity surface have a first electric field, the back cavity surface and the diffraction grating have a second electric field, and the relative electric field strength of the second electric field relative to the first electric field is at a maximum value. The disclosure determines the optimal length of the external cavity in the device through the relationship between the relative electric field strength and the distance between the back cavity surface and the diffraction grating, and significantly reduces the output laser linewidth.
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