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$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

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Updated: Apr 1, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Note: Design of a laser feedback interferometer with double diffraction system.

Dongmei Guo¹, Ming Wang¹

¹Jiangsu Key Laboratory on Opto-Electronic Technology, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China.

The Review of Scientific Instruments

|October 3, 2015

Summary

This summary is machine-generated.

A new laser interferometer uses double diffraction for precise measurements. This compact system offers high stability for displacement sensing applications.

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Last Updated: Apr 1, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Area of Science:

Optics and Photonics
Interferometry
Laser Physics

Background:

Laser interferometers are crucial for precise measurements.
Existing systems can be complex and bulky.
Novel approaches are needed for compact and stable displacement sensing.

Purpose of the Study:

To propose and analyze a novel laser feedback interferometer.
To demonstrate a compact and stable displacement sensor configuration.
To investigate the principles of a double diffraction system in interferometry.

Main Methods:

A laser beam is diffracted by a transmission grating.
The diffracted beam undergoes a second diffraction after reflection.
The double-diffracted beam creates feedback into the laser cavity.

Main Results:

The system generates amplitude and frequency modulation of the lasing field.
Output signal is dependent on grating pitch.
Phase movement direction is determined by interference signal inclination.

Conclusions:

The proposed double diffraction laser interferometer is a novel system.
It offers a compact and highly stable configuration for displacement sensing.
The system shows potential for advanced metrology applications.