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Related Concept Videos

MOSFET01:16

MOSFET

The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
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...
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.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...

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Related Experiment Video

Updated: Jun 24, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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Gain-switched semiconductor laser driven soliton microcombs.

Wenle Weng1, Aleksandra Kaszubowska-Anandarajah2, Jijun He3

  • 1Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland. wenle.weng@epfl.ch.

Nature Communications
|March 4, 2021
PubMed
Summary

We demonstrate a new method for generating microcombs using pulsed semiconductor lasers, significantly reducing power requirements. This advance enables more energy-efficient, chipscale optical frequency combs for microwave applications.

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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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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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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

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Area of Science:

  • Photonics and Optical Engineering
  • Semiconductor Laser Technology
  • Nonlinear Optics

Background:

  • Dissipative Kerr solitons in microcombs are typically generated using continuous-wave lasers.
  • Existing methods suffer from low energy efficiency and high optical power thresholds, especially for microwave repetition rates.
  • Integrated hybrid microcombs offer turnkey operation but face limitations in power efficiency.

Purpose of the Study:

  • To develop a more energy-efficient method for generating soliton microcombs.
  • To reduce the optical power threshold for microcomb generation, particularly for microwave frequencies.
  • To enable robust and stable soliton generation in microresonators using pulsed laser pumping.

Main Methods:

  • Actively switching the bias current of injection-locked III-V semiconductor lasers to create pulsed pumping.
  • Utilizing picosecond laser pulses to pump crystalline and integrated microresonators.
  • Implementing phase engineering on the pulsed pumping scheme to control soliton dynamics.

Main Results:

  • Achieved soliton microcomb generation with stable repetition rates using pulsed pumping.
  • Reduced the required average pumping power by one order of magnitude to a few milliwatts.
  • Demonstrated robust soliton generation and stable trapping on intracavity pulse pedestals through phase engineering.

Conclusions:

  • Pulsed pumping of microresonators significantly enhances energy efficiency and lowers power thresholds for soliton microcombs.
  • Phase engineering of pulsed pumps is crucial for robust soliton generation and stable trapping.
  • This approach advances energy-efficient chipscale microcombs for microwave applications.