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Related Concept Videos

MOSFET Amplifiers01:17

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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Related Experiment Video

Updated: Jul 4, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
08:48

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Mode locking in a free-electron laser amplifier.

N R Thompson1, B W J McNeil

  • 1University of Strathclyde (SUPA), Glasgow G4 0NG, United Kingdom.n.r.thompson@dl.ac.uk

Physical Review Letters
|June 4, 2008
PubMed
Summary
This summary is machine-generated.

A novel optics-free technique generates attosecond pulse trains from free-electron lasers. This method synthesizes frequency combs for advanced radiation generation, enabling new scientific possibilities.

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Area of Science:

  • Physics
  • Quantum Optics
  • Laser Science

Background:

  • Generating attosecond pulse trains is crucial for ultrafast science.
  • Existing methods often rely on complex optical setups.
  • Free-electron lasers (FELs) offer a powerful platform for radiation generation.

Purpose of the Study:

  • To propose and demonstrate an optics-free technique for generating attosecond pulse trains.
  • To synthesize a frequency comb of longitudinal modes within an FEL.
  • To achieve phase-locked attosecond pulses at high power levels.

Main Methods:

  • An optics-free technique applying spatiotemporal shifts between radiation and electron bunch in an FEL.
  • Phase locking achieved by modulating electron beam energy at the mode spacing frequency.
  • Three-dimensional simulations to validate the technique.

Main Results:

  • Demonstrated generation of 400 attosecond (as) pulse trains at 124 angstroms with 2.5 fs spacing and gigawatt power.
  • Predicted generation of 23 as pulse trains at 1.5 angstroms with 150 as spacing and up to 6 GW peak power.
  • Successful synthesis of a frequency comb of longitudinal modes.

Conclusions:

  • The proposed optics-free technique effectively generates attosecond pulse trains from FELs.
  • This method provides a pathway to high-power, phase-locked attosecond radiation.
  • The technique has significant implications for ultrafast spectroscopy and advanced light source development.