Short-delayed self-heterodyne interferometer combined with time-frequency analysis for measuring dynamic spectral properties of tunable lasers

Gang Luo; Ying An; Jinyi Li; Zhenhui Du

doi:10.1117/12.2247245

1 November 2016 Short-delayed self-heterodyne interferometer combined with time-frequency analysis for measuring dynamic spectral properties of tunable lasers

Gang Luo, Ying An, Jinyi Li, Zhenhui Du

Author Affiliations +

Proceedings Volume 10157, Infrared Technology and Applications, and Robot Sensing and Advanced Control; 1015731 (2016) https://doi.org/10.1117/12.2247245
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China

Abstract

The dynamic spectral properties of Continuous Wave (CW) semiconductor lasers during continuous wavelength current tuning process (i.e. slope efficiency, dynamic wavelength current tuning rate and dynamic linewidth) are of utmost significance to high resolution molecular spectroscopy and trace gas detection. In this paper, a system for measuring dynamic spectral properties was setup based on a short-delayed self-heterodyne interferometry with different Optical Path Difference (OPD). And the dynamic spectral properties of different Distributed Feedback (DFB) semiconductor lasers were tested respectively by the system combined with a special time-frequency analysis method. The dynamic slope efficiency unveils nonlinear optical intensity that can’t be neglected in dealing with Residual Amplitude Modulation (RAM). The dynamic wavelength current tuning rate can be used to calibrate laser wavelength. The dynamic linewidth of a laser can be used to evaluate the spectral resolution in gas detecting. The system was demonstrated to simultaneously measure the dynamic spectral properties of different types of tunable lasers with a wavelength range in 2 μm ~ 8 μm during the tuning process. These dynamic spectral properties were distinctly different with the properties while the laser operates at a stable state, which may lay a foundation for deep research and enrichment the highly-precise spectrum database in gas sensing fields.

Citation Download Citation

Gang Luo, Ying An, Jinyi Li, and Zhenhui Du "Short-delayed self-heterodyne interferometer combined with time-frequency analysis for measuring dynamic spectral properties of tunable lasers", Proc. SPIE 10157, Infrared Technology and Applications, and Robot Sensing and Advanced Control, 1015731 (1 November 2016); https://doi.org/10.1117/12.2247245

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