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Small-core As-Se fiber for Raman amplification.
P A Thielen1, L B Shaw, P C Pureza
1SFA, Inc., 9315 Largo Drive West, Largo, Maryland 20774, USA. pthielen@ccs.nrl.navy.mil
Optics Letters
|August 29, 2003
Summary
Researchers developed novel arsenic-selenium (As-Se) fiber demonstrating significant Raman gain. This breakthrough offers potential for advanced infrared fiber lasers and amplifiers.
Area of Science:
- Optoelectronics
- Materials Science
- Photonics
Background:
- Raman spectroscopy is a key technique for material characterization.
- Optical fibers are crucial for telecommunications and sensing.
- Developing novel fiber materials with enhanced optical properties is an ongoing research area.
Purpose of the Study:
- To demonstrate a Raman-activated small-core fiber made of arsenic-selenium (As-Se).
- To characterize the Raman gain properties of the As-Se fiber.
- To explore the potential of As-Se fibers for infrared applications.
Main Methods:
- Fabrication of a small-core As-Se fiber.
- Pumping the fiber with a 1.50 micrometer nanosecond pulsed laser (10.8 W peak power).
- Measuring the Raman gain spectrum and calculating the Raman gain coefficient.
Main Results:
- Achieved over 20-dB gain in a 1.1-m As-Se fiber.
- Observed peak Raman gain at a spectral shift of approximately 240 cm(-1).
- Estimated Raman gain coefficient of 2.3 x 10(-11) m/W, over 300 times higher than silica.
Conclusions:
- As-Se fibers exhibit a significantly higher Raman gain coefficient compared to silica.
- The high gain and broad infrared transparency of As-Se fibers are promising for developing new fiber lasers and amplifiers.
- These findings pave the way for As-Se Raman fiber devices operating in near-, mid-, and long-IR regions.