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Chin. Phys. B, 2015, Vol. 24(12): 124203    DOI: 10.1088/1674-1056/24/12/124203
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Dynamical properties of total intensity fluctuation spectrum in two-mode Nd:YVO4 microchip laser

Zhang Shao-Hui (张韶辉), Zhang Shu-Lian (张书练), Tan Yi-Dong (谈宜东), Sun Li-Qun (孙利群)
Institude of Opto-electronic Engineering, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
Abstract  

We investigate the total intensity fluctuation spectrum of the two-longitudinal-mode Nd:YVO4 microchip laser (ML). We find that low-frequency relaxation oscillation (RO) peaks still appear in the total intensity fluctuation spectrum, which is different from a previous research result that the low-frequency RO peaks exist in the spectrum of the individual mode but compensate for each other totally in the total intensity fluctuation spectrum. Taking the spatial hole-burning effect into account, one and two-mode rate equations for Nd:YVO4 ML laser are established and studied. Based on the theoretical model, we find that when the gains and losses for two longitudinal models are different, a low-frequency RO peak will appear in the total intensity fluctuation spectrum, while when they share the same gain and loss, the total spectrum will behave like that of a single mode laser. Theoretical simulation results coincide with experimental results very well.

Keywords:  lasers and laser optics      chaos      lasers      neodymium      fluctuations      relaxations      and noise      laser theory  
Received:  01 July 2015      Revised:  20 July 2015      Accepted manuscript online: 
PACS:  42.55.Ah (General laser theory)  
  42.55.Sa (Microcavity and microdisk lasers)  
  42.55.Rz (Doped-insulator lasers and other solid state lasers)  
Fund: 

Project supported by the Beijing Higher Education Young Elite Teacher Project, China (Grant No. YETP0086), the Tsinghua University Initiative Scientific Research Programme, China (Grant No. 2012Z02166), and the Special-funded Programme on National Key Scientific Instruments and Equipment Development of China (Grant No. 2011YQ04013603).

Corresponding Authors:  Zhang Shu-Lian     E-mail:  zsl-dpi@mail.tsinghua.edu.cn

Cite this article: 

Zhang Shao-Hui (张韶辉), Zhang Shu-Lian (张书练), Tan Yi-Dong (谈宜东), Sun Li-Qun (孙利群) Dynamical properties of total intensity fluctuation spectrum in two-mode Nd:YVO4 microchip laser 2015 Chin. Phys. B 24 124203

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