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Aliasing

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...

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Updated: Nov 23, 2025

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

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Phase-coherent asynchronous optical sampling system.

Honglei Yang, Shengkang Zhang, Huan Zhao

|December 31, 2020

Summary

This summary is machine-generated.

Achieving mutual phase coherence in asynchronous optical sampling systems is critical. This study demonstrates a system with exceptionally low phase jitter (0.04 rad) and a phase-coherence time of at least 10 seconds.

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Last Updated: Nov 23, 2025

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

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Published on: May 30, 2014

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Published on: January 15, 2013

Area of Science:

Optics
Laser Physics
Metrology

Background:

Mutual phase coherence is essential for asynchronous optical sampling (AOS) systems.
Enhancement typically involves phase-locking femtosecond lasers to a shared reference laser.

Purpose of the Study:

To report a novel AOS system with significantly improved phase coherence.
To quantify the residual optical phase jitter and phase-coherence time.

Main Methods:

Phase-locking dual femtosecond lasers to a narrow-linewidth cavity-stabilized laser.
Measurement of residual optical phase jitter across a wide Fourier frequency band (1 Hz to 5 MHz).
Experimental determination of phase-coherence time using multi-heterodyne beats.

Main Results:

Achieved a low residual optical phase jitter of 0.04 rad at 1.55 µm.
Observed a timing jitter of 30 attoseconds (as).
Inferred a phase-coherence time of at least 10 seconds, with experimental validation of ~8.155 s.

Conclusions:

The developed system offers superior phase coherence for AOS applications.
The achieved low jitter and long coherence time are critical for high-precision measurements.
The system's performance is hardware-limited, demonstrating robust phase stability.