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This paper presents an analysis of period tuning in Quasi-Phase-Matched (QPM) Optical Parametric Oscillators (OPOs), emphasizing the critical influence of crystal thermal expansion. The study investigates how temperature variations, particularly at 25 and 200 °C, affect the period of the QPM structure, with a focus on nonlinear crystals such as periodically poled lithium niobate (PPLN). By thoroughly examining the relationship between temperature and grating period, the paper also presents a mathematical model that accurately describes this dependence. Furthermore, a graphical representation of temperature versus grating period is analysed. This analysis makes a significant contribution to the understanding of QPM OPOs in thermally sensitive applications.

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Thermal Expansion Effects on Quasi-Phase-Matched Optical Parametric Oscillators

  • 会议论文

  • 发表日期：

    2026年

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  • Ugrasen Singh,
  • Abhinav Kumar,
  • Prashant Povel Dwivedi

摘要

This paper presents an analysis of period tuning in Quasi-Phase-Matched (QPM) Optical Parametric Oscillators (OPOs), emphasizing the critical influence of crystal thermal expansion. The study investigates how temperature variations, particularly at 25 and 200 °C, affect the period of the QPM structure, with a focus on nonlinear crystals such as periodically poled lithium niobate (PPLN). By thoroughly examining the relationship between temperature and grating period, the paper also presents a mathematical model that accurately describes this dependence. Furthermore, a graphical representation of temperature versus grating period is analysed. This analysis makes a significant contribution to the understanding of QPM OPOs in thermally sensitive applications.