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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Frequency-modulation-mode-locked optical parametric oscillator.

A Esteban-Martin1, G K Samanta, Kavita Devi

  • 1ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain. adolfo.esteban@icfo.es

Optics Letters
|January 4, 2012
PubMed
Summary
This summary is machine-generated.

We developed a new method to create ultrashort pulses from a continuous-wave optical parametric oscillator (OPO). This technique enhances second harmonic generation (SHG) by four times, showing significant energy concentration for laser applications.

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Area of Science:

  • Nonlinear Optics
  • Laser Physics
  • Quantum Optics

Background:

  • Continuous-wave (cw) optical parametric oscillators (OPOs) are crucial light sources.
  • Generating ultrashort pulses from cw OPOs is challenging.
  • Mode-locking techniques are essential for pulse generation.

Purpose of the Study:

  • To demonstrate a novel technique for generating mode-locked pulses from a cw OPO.
  • To enhance the energy concentration of OPO output.
  • To improve nonlinear frequency conversion efficiency.

Main Methods:

  • Implemented a phase modulator and antiresonant ring interferometer within a cw OPO.
  • Used a doubly-resonant MgO:sPPLT OPO in a standing-wave cavity.
  • Pumped the OPO at 532 nm and synchronized cavity length.

Main Results:

  • Generated a stable train of 800 ps pulses at a 160 MHz repetition rate.
  • Achieved spectral broadening and phase-to-amplitude modulation.
  • Observed a four-fold enhancement in second harmonic generation (SHG) efficiency.

Conclusions:

  • The novel technique successfully generates mode-locked pulses from a cw OPO.
  • The energy concentration in mode-locked pulses significantly enhances nonlinear conversion.
  • This method offers a promising approach for high-efficiency OPO-based light sources.