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Updated: Jul 9, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Published on: August 5, 2013

Photon-phonon collaboratively pumped laser.

Yu Fu¹, Fei Liang¹, Cheng He²

¹State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan, China.

Nature Communications

|December 7, 2023

Summary

This summary is machine-generated.

This study demonstrates a novel laser design that utilizes heat and phonons to enhance laser efficiency, a counterintuitive approach. Researchers observed a shift to a new lasing wavelength, proving heat

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Area of Science:

Optics and Photonics
Solid-State Physics
Materials Science

Background:

The theoretical foundation of lasers, based on stimulated photon emission, was established by Einstein in 1917.
Thermal phonons and heat-induced non-radiative transitions typically hinder laser efficiency.
Conventional laser operation relies on photon pumping, with heat often being a detrimental factor.

Purpose of the Study:

To investigate a counterintuitive approach: enhancing laser efficiency through collaborative photon-phonon pumping enhanced by heat.
To explore the role of temperature as a controllable parameter in laser operation.
To develop a new strategy for achieving highly efficient, low-threshold laser devices.

Main Methods:

Experimental realization of a collaboratively pumped laser system using a Neodymium-doped Yttrium Vanadate (Nd:YVO4) crystal.
Observation of laser transitions under varying temperature conditions.
Analysis of the relationship between photon-pump power threshold (Pth) and temperature threshold (Tth) to establish a lasing phase diagram.

Main Results:

A transition from phonon-free 1064 nm lasing to phonon-pumped 1176 nm lasing was observed in Nd:YVO4 crystal at high temperatures.
Phonon-pumped population inversion was achieved under elevated temperatures, indicating heat's beneficial role.
An additional temperature threshold (Tth) was identified, alongside the photon-pump power threshold (Pth), forming a two-dimensional lasing phase diagram.
A general relationship Pth = C/Tth was verified, analogous to Curie's Law, linking pump power and temperature thresholds.

Conclusions:

Heat can be leveraged to enhance laser efficiency through a collaborative photon-phonon pumping mechanism, contrary to conventional understanding.
The study introduces a new dimension (temperature) for laser control and optimization.
The findings pave the way for developing advanced, efficient, and low-threshold laser devices by exploiting thermal effects.