Enhancing the laser power by stacking multiple dye-doped chiral polymer films

Area of Science:

• Polymer Science
• Optics
• Materials Science

Background:

• Single dye-doped chiral polymer films (8 µm) showed no laser emission.
• Chiral polymer films offer unique optical properties for laser applications.

Purpose of the Study:

• To investigate a novel method for enhancing laser efficiency.
• To explore the effect of stacking dye-doped chiral polymer films on laser performance.

Main Methods:

• Fabrication of multiple dye-doped chiral polymer films.
• Stacking of films to create multi-layered structures.
• Characterization of laser emission and output power.

Main Results:

• No laser emission from a single film.
• Dramatic enhancement in laser efficiency upon stacking two films.
• Increased output laser power with additional stacked films.
• Directional emission observed: forward and backward power nearly equal for 2-3 layers, backward stronger for 6 layers.

Conclusions:

• Stacking dye-doped chiral polymer films is an effective strategy for laser efficiency enhancement.
• The observed directional emission is attributed to laser dye absorption and distributed feedback mechanisms within the chiral polymer films.