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Related Concept Videos

Modes of Standing Waves - I01:03

Modes of Standing Waves - I

A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This phenomenon...
Modes of Standing Waves: II01:04

Modes of Standing Waves: II

The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end.
Forced Oscillations01:06

Forced Oscillations

When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
Properties of Fourier series II01:21

Properties of Fourier series II

Time scaling of signals is a crucial concept in signal processing that affects the Fourier series representation without altering its coefficients. The process modifies the fundamental frequency, thereby changing how the series represents the signal over time. This principle is essential in various applications, including audio and image processing, where signal manipulation is frequent. Understanding function symmetries is fundamental to simplifying the Fourier series.
A function f(t) is...
Harmonic Mean01:09

Harmonic Mean

The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
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Properties of Fourier Transform II01:24

Properties of Fourier Transform II

The Fourier Transform (FT) is an essential mathematical tool in signal processing, transforming a time-domain signal into its frequency-domain representation. This transformation elucidates the relationship between time and frequency domains through several properties, each revealing unique aspects of signal behavior.
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Subharmonic Fourier domain mode locking.

Christoph M Eigenwillig1, Wolfgang Wieser, Benjamin R Biedermann

  • 1Lehrstuhl for Biomolekulare Optik, Fakultät for Physik, Ludwig-Maximilians-Universität München, Munich, Germany.

Optics Letters
|March 14, 2009
PubMed
Summary
This summary is machine-generated.

We developed a novel subharmonic Fourier domain mode-locked (shFDML) laser for faster wavelength sweeping. This compact laser achieves high sensitivity and resolution, enabling advanced optical coherence tomography imaging.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Area of Science:

  • Photonics and Optical Engineering
  • Laser Physics
  • Biomedical Optics

Background:

  • Fourier domain mode-locking (FDML) is crucial for high-speed optical coherence tomography (OCT).
  • Traditional FDML lasers face limitations due to long cavity fiber lengths, impacting sweep speed and system integration.
  • Developing compact and efficient wavelength-swept lasers is essential for advancing OCT applications.

Purpose of the Study:

  • To demonstrate a novel subharmonically Fourier domain mode-locked (shFDML) wavelength-swept laser source.
  • To achieve a reduced cavity fiber length and enhanced sweep speed compared to standard FDML lasers.
  • To investigate the performance characteristics and imaging capabilities of the shFDML laser.

Main Methods:

  • A subharmonically Fourier domain mode-locked laser configuration was designed and implemented.
  • The laser utilized a recirculating delay line and an optical bandpass filter as a switch.
  • The system's sweep ranges, sensitivity, axial resolution, and sweep rates were experimentally measured.

Main Results:

  • A significantly reduced cavity fiber length was achieved.
  • Sweep ranges up to 95 nm were obtained at the 1/5th subharmonic.
  • Maximum sensitivity of 116 dB and axial resolution of 12 microm were measured.
  • A maximum sweep rate of 570 kHz was demonstrated, enabled by shFDML operation.
  • Optical coherence tomography imaging was successfully performed.

Conclusions:

  • The developed shFDML laser offers a reduced fiber length and enables simple scaling of sweep speed.
  • shFDML technology provides a promising pathway for developing faster and more compact wavelength-swept light sources.
  • This technology has significant implications for high-resolution and high-speed optical coherence tomography systems.