Amplified Spontaneous Emission in Paper

Area of Science:

• Optics and Photonics
• Materials Science
• Spectroscopy

Background:

• Industrially produced paper is typically not considered an optical material.
• Fluorescent brightening agents (FBA) are common additives in paper products.
• Stimulated emission requires a gain medium exceeding a specific threshold.

Purpose of the Study:

• To investigate copy paper as a novel optical material for stimulated emission.
• To demonstrate the tunability of emission wavelengths using additional dyes.
• To explore applications in spectroscopic analysis.

Main Methods:

• Utilizing commercially available copy paper and FBA-treated calligraphy paper.
• Applying fluorescent dyes (e.g., Coumarin 307) and highlighter pens.
• Measuring amplified spontaneous emission and stimulated emission spectra.

Main Results:

• Copy paper with FBA achieves sufficient gain for amplified spontaneous emission.
• Emission wavelength can be tuned from blue (~440 nm) to orange (~590 nm) by adding dyes.
• Demonstrated narrow-band stimulated emission properties in paper-based materials.

Conclusions:

• Copy paper can function as a cost-effective optical gain medium.
• Tunable emission from paper offers potential for low-cost spectroscopic devices.
• This research opens new avenues for utilizing common materials in optical applications.