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P1111444352

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Robustness Analysis of Linear Time-Invariant Dynamic State Observers

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P1111444352

  1. 1. Numerical Study of Auto-Control and Stabilization of Pulse Repetition Rate of Passively Q-Switched Laser Systems Jala M. El-Azab Hamed M. Kandel and Mohamed A. Khedr National Institute of Laser Enhanced Sciences, Cairo University, Egypt. 1www.icgst.com http://www.icgst.com/paper.aspx?pid=P1111444352
  2. 2. In this work, a simplified technique to control and stabilize the passively Q- switched laser pulses is proposed and denoted by automatic pulsed pumping technique. The technique is applied to a diode-pumped Yb:YAG laser passively Q- switched by Cr4+:YAG as saturable absorber by numerically solving the coupled rate equations describing the system. The technique is based on the detection of the generated Q-switched pulses which alter the pumping power either to be switched off or set to a lower value depending on the selected modulation depth. The system was pumped using different pumping techniques; continuous, pulsed pumping and automatic pulsed pumping in order to compare the time stability of the generated Q-switched pulses. The proposed technique has shown a good control of the pulse repetition rate of Q-switched pulses with high stability. The technique allowed high pulse repetition rate as similar to the pulsed pumping scheme while maintained the time stability of the continuous pumping scheme 2www.icgst.com http://www.icgst.com/paper.aspx?pid=P1111444352 Numerical Study of Auto-Control and Stabilization of Pulse Repetition Rate of Passively Q-Switched Laser Systems Abstract
  3. 3. 3www.icgst.com Graduated from Faculty of Engineering, Electronics and Electrical Engineering Dept. , Cairo University. Received both the M.Sc. degree in nonlinear semiconductor laser diodes in 2002 and the Ph.D. degree in chaotic semiconductor laser engineering in 2006 from National Institute of Laser Enhanced Sciences, Cairo University. Working on modeling semiconductor laser diodes, chaotic optical communications, optical networks, photonic crystal fibers, optical logic gates and holography applications. Electronics and Electrical Engineering Dept. , Cairo University http://eece.cu.edu.eg/
  4. 4. 4www.icgst.com Hamed M. Kandel was born in Cairo, Egypt in 1980. Graduated from Faculty of Science, Chemistry & Physics Dept., Cairo University in 2001. Received both the M.Sc. degree in theoretical study of X-ray laser in 2008 and the Ph.D. degree in short pulse solid-state laser modeling in 2014 from National Institute of Laser Enhanced Sciences, Cairo University. Working on theoretical study of laser systems, ultra-short laser pulse generation and control, generation of new laser wavelengths in XUV and X-ray range. Faculty of Science, Chemistry & Physics Dept., Cairo University http://cu.edu.eg/Faculty-News-Arch-21.html
  5. 5. 5www.icgst.com Mohamed A Khedr was born in Kalubia, Egypt in 1956. Graduated from Faculty of Science, Physics Dept., Tanta University in 1978. Received both the M.Sc. in the physical phenomena of vacuum arc discharge in 1990and Ph.D. degrees in the micro hollow cathode discharge using Laser and mass spectroscopy in 1995 from physics Dept., Faculty of science Cairo University. Working in the dept. of Laser Science and its Interaction with Matter National Institute of Laser Science Cairo University. Fields of interest; tunable ultrafast laser systems, optical parametric oscillators, thin films, infrared optical detectors, Laser plasma Acceleration. Faculty of Science, Physics Dept., Tanta University http://sci.tanta.edu.eg/English/Pages/default.aspx
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