Xem 1-7 trên 7 kết quả Mode locking
  • Discovered almost fifty years ago at Bell Labs (1964), the Nd:YAG laser has undergone an enormous evolution in the years, being now widely used in both basic research and technological applications. Nd:YAG laser is extremely versatile in its output characteristics, yielding emission from continuous wave to very large energy pulses or very high peak-power pulses. Also, it covers a large spectral range, namely near infrared, visible (second harmonic) and ultraviolet (third to fifth harmonic).

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  • This book discusses aspects of laser pulses generation, characterization, and practical applications. Some new achievements in theory, experiments, and design are demonstrated. The introductive chapter shortly overviews the physical principles of pulsed lasers operation with pulse durations from seconds to yoctoseconds. A theory of mode-locking, based on the optical noise concept, is discussed. With this approximation, all paradoxes of ultrashort laser pulse formation have been explained.

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  • the generation of ultrashort laser pulses. Beginning with mode-locking of glass lasers in the 1960s, the development of dye lasers brought the pulse width down from picoseconds to femtoseconds. The breakthrough in solid state laser pulse generation provided the current reliable table-top laser systems capable of average power of about 1 watt, and peak power density of easily watts per square centimeter, with pulse widths in the range of four to eight femtoseconds.

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  • Well known and established techniques, which allow obtaining intense laser pulses, have led to the development of advanced laser system used in science and various industries. Often at times, they combine Q-switching and mode-locking techniques in a single device to achieve unprecedented average pulse powers (e.g. HiLASE, HiPER, ELI, NIF, LiFE) for scientific applications, such as secondary sources of EUV, X-ray or particles, or as inertial confinement fusion (ICF) drivers.

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  • Ebook Femtosecond laser pulses principles and experiments is compiled with the content: Laser Basics, Pulsed Optics, Methods for the Generation of Ultrashort Laser Pulses Mode-Locking, Further Methods for the Generation of Ultrashort Optical Pulses, Pulsed Semiconductor Lasers, How to Manipulate and Change the Characteristics of Laser Pulses,... Invite you to consult the document details.

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  • Adobe Photoshop Tools Add mode (Shape tools) Subtract mode (Shape tools) Lock transparency pixels (on / off) Decrease brush size Increase brush size Decrease brush hardness by 25% Increase brush hardness by 25% Previous brush Next brush First brush Last brush Tool opacity 10% ® 100% Flow 10% → 100% Path / Direct Selection tools Brush / Pencil / Color Replacement tools N ® ® CS4 Keyboard Shortcuts Alt+F Ctrl+Alt+O Ctrl+W / Ctrl+F4 Ctrl+Alt+W / Ctrl+Shift+F4 Ctrl+Shift+W Ctrl+Q Ctrl+Alt+Shift+ I Ctrl+N Ctrl+Alt+N Ctrl+O Ctrl+Alt+Shift+O Ctrl+Shift+P Ctrl+Shift+O Ctrl+P Ctr...

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  • Manual Locking Under some circumstances, a user might want to override default locking. Oracle allows manual override of automatic locking features at both the row level (by first querying for the rows that will be updated in a subsequent statement) and the table level. Quiesce Database Database administrators occasionally need isolation from concurrent non-database administrator actions, that is, isolation from concurrent non-database administrator transactions, queries, or PL/SQL statements.

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