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Gain

Gain

Gain and phase shift are properties of linear circuits that describe the effect a circuit has on a sinusoidal input voltage or current. The circuit's behavior that contains reactive elements will depend on the frequency of the input sinusoid. As a result, it is observed that the gain and phase shift will all be frequency functions.
Gain:
Suppose Vin is the input and Vout is the output signal to a circuit.

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Related Experiment Video

Updated: Jun 10, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

In-phase coupled single-mode gain waveguide array laser.

Pengfei Sha¹, Jianguo Xin, Liping Fang

¹School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China.

|July 17, 2010

Summary

This summary is machine-generated.

Researchers developed a gain waveguide array using a sliced slab waveguide structure. This array achieves a single-mode frequency output locked in-phase, with a suppressed far-field distribution and no sidelobes.

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Related Experiment Videos

Last Updated: Jun 10, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

Published on: April 1, 2020

Area of Science:

Optics and Photonics
Waveguide Technology
Laser Physics

Background:

Waveguide arrays are crucial for controlling light propagation.
Achieving single-mode operation with high spatial quality is a persistent challenge.

Purpose of the Study:

To demonstrate a novel gain waveguide array structure.
To achieve in-phase locked, single-mode frequency output.
To obtain a suppressed far-field distribution without sidelobes.

Main Methods:

Fabrication of a sliced slab waveguide structure.
Development of a gain waveguide array.
Characterization of the output beam properties.

Main Results:

Successful production of a gain waveguide array.
Obtained in-phase locked, single-mode frequency output.
Achieved a single-peak intensity distribution without sidelobes.
Demonstrated a highly spatially suppressed far-field distribution.

Conclusions:

The sliced slab waveguide structure is effective for creating high-quality gain waveguide arrays.
The developed array enables superior beam control and single-mode operation.