Sökning: "Self phase modulation"

Hittade 5 uppsatser innehållade orden Self phase modulation.

  1. 1. Generation of attosecond X-ray pulses in free-electron lasers using electron energy modulation and undulator tapering

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/FREIA

    Författare :Karl-Fredrik Boholm Kylesten; [2023]
    Nyckelord :attosecond; free-electron laser; XFEL; self-amplified spontaneous emission; SASE; tapering; energy modulation;

    Sammanfattning : Free-electron lasers (FELs) are among the world's most intense artificial artificial sources of coherent light and are tunable to various wavelengths, including the X-ray spectrum. X-ray FELs (XFELs) are extremely useful for diffraction experiments to study molecules, materials, and quantum systems. LÄS MER

  3. 2. Spectral broadening of 4 mJ femtosecond pulses using a bulk multi-pass cell

    Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Författare :Saga Westerberg; [2023]
    Nyckelord :Lasers; Ultrashort; Nonlinear Optics; femtosecond; Multi-Pass Cell; Spectral broadening; pulse post-compression; Self phase modulation; Physics and Astronomy;

    Sammanfattning : Nonlinear optical effects can be used for spectral broadening, which the basis of the field of post-compression of laser pulses. When the intensity of light becomes high enough the refractive index becomes intensity dependent, and as the intensity often varies both with position and time so does the refractive index. LÄS MER

  4. 3. Evaluation of white-light generation as possible seed for a mid-infrared optical parametric chirped pulse amplifier

    Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Kärnfysik

    Författare :Chuang Lu; [2017]
    Nyckelord :nonlinear linear optics; ultrafast optics; Mid-infrared generation; near-infrared; Optical parametric amplification; Optical Parametric Chirped-pulse Amplification; supercontinuum generation; white-light generation; laser induced filamentation; Dispersion-scan; nonlinear propagation; Physics and Astronomy;

    Sammanfattning : White-light spectra of different crystals, based on 1030-nm intense pump pulses have been investigated in order to derive a near-infrared seed for mid-infrared generation. Among ten crystals, YAG (yttrium aluminium garnet), KGW (potassium gadolinium tungstate) and YVO4 (yttrium orthovanadate) exhibit the most suitable properties for supercontinuum generation with high efficiency for spectral broadening as well as high tolerance to optical damage. LÄS MER

  5. 4. Control of a Synchronous Machine

    Uppsats för yrkesexamina på avancerad nivå, Elektricitetslära

    Författare :Jens Olofsson; [2010]
    Nyckelord :synchronous machine; BLDC; Sensorless;

    Sammanfattning : The VAWT project at Uppsala University has successfully managed to develop a vertical axis wind turbine (VAWT). The VAWT has many benefits compared to the Horizontal axis wind turbines (HAWT) which are the most common wind turbine design today. LÄS MER

  7. 5. System Design of RF Receiver and Digital Implementation of Control Logic

    Uppsats för yrkesexamina på grundnivå, Institutionen för teknik och naturvetenskap

    Författare :Marcus Ström; [2003]
    Nyckelord :Electronics; Transceiver; receiver; RF; telemetry; modulation; coding; system design; digital implementation; VHDL; Verilog; RTL; low power consumption; LNA; detector and decoder.; Elektronik;

    Sammanfattning : This report is the outcome of a thesis work done at Linköpings University, campus Norrköping. The thesis work was part of the development of a RF transceiver chip for implantable medical applications. The development was done in cooperation with Zarlink Semiconductor AB, located in Järfälla, Stockholm. LÄS MER