Sökning: "Free-electron laser seeding"

Hittade 5 avhandlingar innehållade orden Free-electron laser seeding.

1. 1. Probing and improving coherence in Free-electron lasers

   Författare :Mihai Pop; Synkrotronljusfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Accelerators; Free electron laser; Synchrotron radiation; Coherence; Young double-slit; spectrum analysis; Simulations;

   Sammanfattning : Free electron lasers or FELs, have transformed the way science has been done in the last decades by providing coherent, highly brilliant radiation at wavelengths not achievable with conventional lasers. Their most important characteristic, along side brightness, is their coherence, which allows users to perform experiments that rely on precise phase characteristics of the probing radiation. LÄS MER

3. 2. Studies on high brightness electron beams for short pulses and free electron laser

   Författare :Sara Thorin; Lunds universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bunch compression; sub-ps pulses; X-rays; High brightness electron beam; free electron laser; electron accelerator; collective effects.;

   Sammanfattning : Accelerator based lightsources are one of the most powerful tools today for producing high intensity radiation at very short wavelengths. While synchrotron storage rings provide a high average brilliance in a wide wavelength range, the next generation of lightsources aim towards producing ultra-short pulses in the X-ray regime. LÄS MER

4. 3. Toward Creating a Coherent, Next-Generation Light Source with special emphasis on nonlinear harmonic generation in single-pass, high-gain free-electron lasers

   Författare :Sandra G. Biedron; Lunds universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Visible and Ultraviolet Sources; Intense Particle Beams and Radiation Sources; Frequency Conversion; Free-Electron Lasers; Harmonic Generation; Physics; Fysik;

   Sammanfattning : There is a strong desire for short wavelength (~1 Å), short pulsewidth (.... LÄS MER

5. 4. Timing Diagnostics and Coherent Harmonics from a test-FEL

   Författare :Nino Cutic; Lunds universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Free electron laser; undulator radiation; coherent harmonic generation; circular polariyation; vacuum ultra-violet; seed pulse timing; bunch length; electro-optical spectral decoding;

   Sammanfattning : The test free-electron laser (test-FEL) at MAX-lab in Lund demonstrated for the first time circularly polarized coherent femtosecond pulses at 66 nm wavelength. A 375 MeV electron bunch was seeded by a femtosecond laser at 263 nm and coherent harmonics were extracted in an APPLE-II type elliptical undulator. LÄS MER

7. 5. Towards ultrafast imaging with extreme ultraviolet light sources

   Författare :Jörg Schwenke; Lunds universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Photo emission electron microscopy; Focusing of X-ray radiation; Digital holography; High-order harmonic generation; Free-electron laser seeding; Secondary electron cascades; Fysicumarkivet A:2012:Schwenke;

   Sammanfattning : This thesis reports experimental studies performed with two advanced coherent XUV sources with ultrashort pulse duration, high-order harmonic generation and seeded-free electron laser. High-order harmonic generation (HHG) is the generation of overtones of a fundamental laser pulse in a medium, e.g. noble gases. LÄS MER