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Graphene based widely-tunable and singly-polarized pulse generation with random fiber lasers
B C Yao1,2, Y J Rao1, Z N Wang1
1Key Laboratory of Optical Fiber Sensing and Communications (Education Ministry of China), University of Electronic Science and Technology of China, Chengdu 610054, China.
Scientific Reports
|December 22, 2015
Summary
Researchers achieved coherent pulse generation using modeless random lasers and graphene. This cavity-free approach offers tunable pulsewidths and repetition rates, enabling new applications in sensing and imaging.
Area of Science:
- Photonics and Laser Technology
- Materials Science
Background:
- Traditional pulse generation relies on stabilized cavities and mode structures for phase-locking.
- Modeless, cavity-free random lasers offer potential for high quantum efficiency and broad tunability.
- Achieving coherent pulse generation in random lasers has been a significant challenge.
Purpose of the Study:
- To demonstrate coherent pulse generation in modeless random lasers.
- To leverage graphene's properties for enhanced pulse characteristics.
- To explore new avenues for tunable and stable pulsed laser systems.
Main Methods:
- Utilized monolayer graphene for its polarization selectivity and broadband saturable absorption.
- Implemented a modeless, cavity-free random laser architecture.
- Employed polarization modulation to achieve temporal compression and control pulse properties.
Main Results:
- Achieved coherent pulse generation from modeless random lasers.
- Demonstrated simultaneous temporal compression of cavity-free pulses.
- Observed broadly tunable pulsewidth (down to 900 ps) and repetition rate (up to 3 MHz).
- Generated a singly-polarized pulse train with a high extinction ratio (41 dB).
- Exhibited robust pulse-to-pulse stability and wide-wavelength operation.
Conclusions:
- Graphene-based modeless random lasers enable tunable coherent pulse generation.
- This cavity-free approach offers advantages over conventional pulsed fiber lasers.
- The technology has potential applications in fiber-optic sensing, speckle-free imaging, and laser-material processing.
- Provides a novel method for generating tunable, singly-polarized pulses for non-random lasers.
