Toward continuous-wave operation of organic semiconductor lasers

Area of Science:

• Organic electronics
• Photonics and optical devices
• Materials science

Background:

• Continuous-wave (CW) lasing from organic semiconductor films is crucial for applications like spectroscopy, data communication, and sensing.
• Achieving CW lasing in organic materials remains a significant challenge due to various loss mechanisms and degradation issues.

Purpose of the Study:

• To demonstrate a low-threshold, surface-emitting organic laser operating in a quasi-continuous-wave regime.
• To investigate the potential for developing practical continuous-wave organic semiconductor laser technology.

Main Methods:

• Fabrication of organic semiconductor thin films with high optical gain and photoluminescence quantum yield.
• Integration of a mixed-order distributed feedback grating to reduce lasing thresholds.
• Application of a simple encapsulation technique to mitigate thermal degradation and ablation.

Main Results:

• Achieved quasi-continuous-wave lasing at 80 MHz and long-pulse (30 ms) photoexcitation.
• Demonstrated low lasing thresholds attributed to optimized gain medium and grating design.
• Successfully suppressed laser-induced thermal degradation and ablation of the gain medium.

Conclusions:

• The study presents a significant advancement towards realizing continuous-wave organic semiconductor lasers.
• Engineering of the gain medium and device architecture are key factors for achieving high-performance organic lasers.
• This work supports the feasibility of developing practical CW organic laser technology.