Dr. Tianhong Lian Profile

Dr. Tianhong Lian

at Xi'an Univ of Technology

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Publications (2)

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Proceedings Article | 12 March 2020 Paper

Dynamics of the spatial mode competition process in a dual-cavity solid-state vortex laser

Tianhong Lian, Shiyu Wang, Ke Kou, Mingxing Jiao

Proceedings Volume 11437, 114370D (2020) https://doi.org/10.1117/12.2543648

KEYWORDS: Solid state lasers, Nd:YAG lasers, Laser resonators

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A multiple mode rate equations model of the dual-cavity solid-state vortex laser has been established and used to investigate the dynamic process of the Laguerre-Gaussian (LG) modes competition. We calculated the dynamic processes of the modes LG01, LG02 and LG03. The results show that the laser exhibits a complex cross-spiking and cross-relaxation characteristic during the early stage of mode competition. The later start of a mode would cause the cross-spiking and cross-relaxation process, and ultimately the mode started firstly may even not be the one that can be sustained at steady state. To ensure the successful mode selection, the reflectivity of the secondary cavity should be larger than that of the primary cavity, but a too large one would decrease the stable output power of the mode LG01, even to its suppression. The pumping beam distribution has a great influence on the dynamic process and the stable output power of the modes, so the radius and the order of the pumping beam should be optimized. In our case, the optimized beam radius is 0.4 mm, slightly larger than the beam radius of the mode LG00, i.e.0.3 mm, and the optimized order is 4. Moreover, if the laser do not have proper reflectivities of output couplers and pumping beam distribution, the mode selection may not be demonstrated only by optimization of the aperture radius, which would only delay the crossspiking.

Proceedings Article | 12 March 2020 Paper

A fast and cost-efficient technique for estimating feedback strength parameter C in laser self-mixing interferometry

Ke Kou, Cuo Wang, Tianhong Lian, Jun Weng

Proceedings Volume 11439, 114390Q (2020) https://doi.org/10.1117/12.2543271

KEYWORDS: Laser interferometry, Nd:YAG lasers, Sensors, Laser applications

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The parameter C, named optical feedback strength coefficient, has always exhibited significance in the field of laser self-mixing interferometry (SMI), and it can be utilized to assess the feedback regime or reconstruct an external target's motion. Plenty of researchers have concerned about the technique of acquiring C from SMI signals. Instead of empirical conclusions and according to clear mathematical deduction, this manuscript proposes a fast and cost-efficient method to evaluate C, eliminating large calculation consumption as in the reported optimization methods. Regardless of laser types and the line-width enhancement factor α, it is possible to achieve a relative precision within 5% for C ranging from 0.1 to 5, which is helpful for SMI theoretical studies and SMI sensors.

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