Diffraction characteristics of chirped femtosecond laser pulse by rectangle reflection grating |
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| Authors: | Guohua Liu Rongrong Xu Hanping Wu Wenbing Yu |
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| Institution: | 1. Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India;2. Samtel Center for Display Technologies, Indian Institute of Technology Kanpur, Kanpur 208016, India;3. Materials Science Programme, Indian Institute of Technology Kanpur, Kanpur 208016, India;1. Department of Physics, Korea Advanced Institute of Science and Technology, 373-1 Guseongdong, Daejeon 305–701, South Korea;3. Department of Physics, Hannam University, 133 Ojungdong, Daejon 306-791, South Korea;1. Department of Electronics and Electrical Engineering, Keio University, 3-14-1 Hiyoshi Kohoku-ku, Yokohama-shi, Kanagawa-ken 223-8522, Japan;2. Institute of Electronics, Bulgarian Academy of Sciences, Tzarigradsko shousse 72, Sofia 1784, Bulgaria;1. ENEA—Research Centre Casaccia Roma, Italy;2. Department of Physics, Bhavnagar University, Bhavnagar, Gujrat, India;1. Applied Physics Division, Soreq NRC, Yavne 81800, Israel;2. Department of Electrical Engineering—Physical Electronics, Faculty of Engineering, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel;3. Micro- and Nano-Fabrication Unit (MNFU), Department of Electrical Engineering, Technion—Israel Institute of Technology, Haifa 32000, Israel;4. The Center for Nano Science and Nanotechnology, Faculty of Science, The Hebrew University of Jerusalem, Jerusalem 91904, Israel |
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| Abstract: | The spectral and temporal intensity distribution expression for the chirped femtosecond laser pulse diffracted by a rectangle reflection grating is derived. The effects of the chirped coefficient on the spatiotemporal and spectral characteristics are theoretically investigated in detail, and a criterion for judging whether or not the diffraction pulse is just split into two independent pulses in the temporal domain is obtained. The results show that the envelope curve of spectral intensity on the diffraction axis is more blue-shift, and its full width at e? 1 maximum is wider for bigger chirped coefficient. The principal maximum on the temporal axis can split into two independent principal maximums for enough height from the upper and the nether reflection surface of the grating. Each principal maximum splits into two smooth pulses, namely one principal pulse and one secondary pulse, and the secondary pulse gradually increases with the increasing of the chirped coefficient; the duration of two principal pulses increases with the increasing of the height of the upper and the nether reflection surface of the grating. |
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