Anomalous spectral behaviour of diffracted chirped Gaussian pulses in the near field
Pan Liu-Zhan (潘留占)ab, Lü Bai-Da (吕百达)bc
a Department of Physics, Luoyang Normal College, Luoyang 471022, Chinab Institute of Laser Physics & Chemistry, Sichuan University, Chengdu 610064, China; b State Key Laboratory of Laser Technology, Huazhong University of Science & Technology, Wuhan 430074, China
Abstract By using the Fourier transform method, analytical expressions for the axial power spectrum and near-field intensity in the spacetime domain of chirped Gaussian pulses diffracted at an aperture are derived, which permit us to study changes in spectral and temporal profiles of the chirped Gaussian pulses both analytically and numerically. Detailed numerical results and physical analysis show that spectral anomalies take place in the neighbourhood of certain critical distances, and the shifting of maximum and splitting of temporal intensity profiles appear. In particular, for ultrashort chirped pulses, there exists also spectral switch. Besides the truncation parameter, the chirp parameter and pulse duration affect the behaviour of spectral switches.
Received: 21 July 2003
Revised: 24 September 2003
Accepted manuscript online:
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.