中国物理B ›› 2019, Vol. 28 ›› Issue (2): 24211-024211.doi: 10.1088/1674-1056/28/2/024211

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Nonlinear behavior of the population dynamics of three-level systems in the presence of single photon absorption

Allam Srinivasa Rao   

  1. Photonic Sciences Laboratory, Physical Research Laboratory, Thaltej, Ahmedabad, Gujarat 380059, India
  • 收稿日期:2018-11-04 修回日期:2018-12-09 出版日期:2019-02-05 发布日期:2019-02-05
  • 通讯作者: Allam Srinivasa Rao E-mail:asvrao@prl.res.in

Nonlinear behavior of the population dynamics of three-level systems in the presence of single photon absorption

Allam Srinivasa Rao   

  1. Photonic Sciences Laboratory, Physical Research Laboratory, Thaltej, Ahmedabad, Gujarat 380059, India
  • Received:2018-11-04 Revised:2018-12-09 Online:2019-02-05 Published:2019-02-05
  • Contact: Allam Srinivasa Rao E-mail:asvrao@prl.res.in

摘要:

We numerically investigate the population dynamics in a single photon resonant three-level cascade and non-cascade energy level molecules at 532-nm wavelength. The time-dependent population in the energy levels in the presence of 100 ps (pico-second) and 100 ns (nano-second) laser pulses is described in the form of rate equations. We provide a brief idea of how the optical energy transfer takes place in the light-matter interaction and we also discuss the absorption as a function of pulse width and repetition rate. We also plot the z-scan transmittance curve as a function of number of excitation pulses participating in the absorption.

关键词: nano-second laser, pico-second laser, nonlinear absorption, z-scan

Abstract:

We numerically investigate the population dynamics in a single photon resonant three-level cascade and non-cascade energy level molecules at 532-nm wavelength. The time-dependent population in the energy levels in the presence of 100 ps (pico-second) and 100 ns (nano-second) laser pulses is described in the form of rate equations. We provide a brief idea of how the optical energy transfer takes place in the light-matter interaction and we also discuss the absorption as a function of pulse width and repetition rate. We also plot the z-scan transmittance curve as a function of number of excitation pulses participating in the absorption.

Key words: nano-second laser, pico-second laser, nonlinear absorption, z-scan

中图分类号:  (Laser spectroscopy)

  • 42.62.Fi
42.65.-k (Nonlinear optics) 78.20.Bh (Theory, models, and numerical simulation) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))