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Random fiber laser directly pumped by a high-power laser diode
S A Babin1, E I Dontsova, S I Kablukov
1Institute of Automation and Electrometry, SB RAS, Novosibirsk 630090, Russia. babin@iae.nsk.su
Optics Letters
|August 31, 2013
Summary
This study demonstrates random lasing using Rayleigh scattering in a fiber, converting low-quality laser diode output into a high-quality laser beam. This method offers a new approach for developing high-power fiber lasers with improved beam quality.
Area of Science:
- Photonics and Optics
- Materials Science
Background:
- High-power fiber lasers are crucial for various applications.
- Improving beam quality in fiber lasers remains a significant challenge.
- Existing methods for beam quality enhancement can be complex and costly.
Purpose of the Study:
- To demonstrate a novel random lasing system using Rayleigh scattering in a passive fiber.
- To convert a low-quality laser diode beam into a high-quality laser output.
- To explore a new pathway for developing high-power fiber lasers with superior beam characteristics.
Main Methods:
- Utilizing a passive fiber for random lasing.
- Employing Rayleigh scattering (RS) for random distributed feedback (RDFB).
- Directly pumping the fiber with a high-power laser diode (LD).
Main Results:
- Successfully demonstrated random lasing based on RS-RDFB.
- Converted a 938 nm low-quality LD beam to a 980 nm high-quality laser output.
- Achieved a 4.5 times lower divergence in the output beam compared to the pump beam.
Conclusions:
- Rayleigh scattering in passive fibers provides an effective RDFB mechanism for lasing.
- This technique offers a new method for producing high-quality laser output from low-quality pump sources.
- The demonstrated approach shows potential for developing advanced high-power fiber lasers.
