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Related Experiment Video

Updated: Jul 10, 2026

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

Published on: January 29, 2013

Optical microsphere amplification system.

Kouki Totsuka¹, Makoto Tomita

¹Department of Physics, Faculty of Science, Shizuoka University, Japan. sktotsu@ipc.shizuoka.ac.jp

|November 3, 2007

Summary

Researchers developed a compact optical amplifier using a rare-earth-doped microsphere and fiber taper. This system achieved an amplification factor of 2.5, demonstrating efficient light amplification.

Area of Science:

Optics
Photonics
Materials Science

Background:

Whispering gallery mode resonators are crucial for optical devices.
Efficient coupling of light into microspheres is challenging.
Rare-earth-doped materials offer potential for optical gain.

Purpose of the Study:

To demonstrate a compact optical amplification system.
To enhance spatial matching between signal and pump beams.
To achieve optical gain using a rare-earth-doped microsphere.

Main Methods:

Utilized a fiber taper for efficient light injection.
Employed a rare-earth-doped microsphere as the gain medium.
Investigated the effect of pump power on transmission spectra.

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Last Updated: Jul 10, 2026

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

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Published on: January 29, 2013

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Main Results:

Achieved efficient spatial matching of signal and pump beams.
Observed the transition from resonance dip to gain peak with increased pump power.
Realized an amplification factor of up to 2.5.

Conclusions:

The fiber taper-coupled rare-earth-doped microsphere is an effective compact optical amplifier.
This system shows promise for integrated photonic applications.
The demonstrated amplification mechanism is tunable with pump power.