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Photonics Research

Photonics Research

| A joint OSA/Chinese Laser Press publication

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September


Blind spectral deconvolution algorithm for Raman spectrum with Poisson noise

  • Liu Hai, Zhang Tianxu, Yan Luxin, and Fang Houzhang
  • received 08/08/2014; accepted 09/13/2014; posted 09/22/2014; Doc. ID 220670
  • [full text: PDF (432) KB)]
  • Abstract: A blind deconvolution algorithm with modified Tikhonov regularization is introduced. To improve the spectral resolution, spectral structure information is incorporated into regularization by using the adaptive term to distinguish spectral structure from other regions. The proposed algorithm can effectively suppress the Poisson noise as well as preserved the spectral structure and detailed information. Moreover, it becomes more robust with the change of the regularization parameter. Comparative results on simulated and real degraded Raman spectra are reported. The recovered Raman spectra are easily for extracting the spectral feature and interpreting the unknown chemical mixture.

Keywords (OCIS):

  • (100.3190) Image processing : Inverse problems
  • (300.6320) Spectroscopy : Spectroscopy, high-resolution
  • (300.6450) Spectroscopy : Spectroscopy, Raman

Efficiency improvement of dual-wavelength mode-locked laser based on compactly combined dual gain media and effect of spatial hole burning

  • Yung-Fu Chen, Yu-Jen Huang, Y. S. Tzeng, and H. H. Cho
  • received 07/04/2014; accepted 09/10/2014; posted 09/15/2014; Doc. ID 216393
  • [full text: PDF (565) KB)]
  • Abstract: A high-efficiency dual-wavelength self-mode-locked laser at 1.06 μm based on a physically combined Nd:YVO4/Nd:LuVO4 composite gain medium is reported. Under an incident pump power of 4.95 W, this picosecond laser efficiently emits the total output power of 1 W with the optical conversion efficiency of up to 20% and the shortest pulse width of 19 ps at the repetition rate of 3.88 GHz. The effect of spatial hole burning is experimentally and theoretically explored to manifest that not only the pulse duration would monotonically decrease, but also the temporal behavior would gradually display a narrow-peak-on-a-pedestal shape when the separation between the input end mirror and the gain medium is continuously reduced to increase the number of longitudinal lasing modes at 1064 and 1065 nm.

Keywords (OCIS):

  • (140.3480) Lasers and laser optics : Lasers, diode-pumped
  • (140.3530) Lasers and laser optics : Lasers, neodymium
  • (140.3580) Lasers and laser optics : Lasers, solid-state
  • (140.4050) Lasers and laser optics : Mode-locked lasers

Articles 1 to 2 of 2





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