Sub-nanosecond Raman fiber amplifier based red-orange light source

Area of Science:

• Photonics and Laser Technology
• Fiber Optics
• Nonlinear Optics

Background:

• Developing compact and efficient laser sources is crucial for various scientific and industrial applications.
• Existing fiber laser systems often face limitations in wavelength flexibility and pulse characteristics.

Purpose of the Study:

• To introduce a fully-integrated, two-color, sub-nanosecond fiber laser system.
• To demonstrate simultaneous or independent amplification of dual-wavelength signals.
• To achieve high-quality, diffraction-limited output beams at specific wavelengths.

Main Methods:

• Utilizing a backward-pumped polarization-maintaining Raman phosphosilicate fiber amplifier (RFA).
• Employing gain-switched distributed feedback (DFB) laser diodes at 1178 nm and 1310 nm.
• Integrating fiber-coupled second harmonic generator (SHG) modules for wavelength conversion.

Main Results:

• The system produces sub-nanosecond pulses at 589 nm and 655 nm.
• Achieved repetition rates from 40 to 100 MHz with average power up to 3 W.
• Maintained excellent beam quality (M² < 1.05) across all operating conditions.

Conclusions:

• The developed fiber laser system offers a versatile and robust platform for generating tunable, high-quality optical pulses.
• The integration of RFA and SHG modules enables efficient two-color output.
• The system's performance characteristics make it suitable for advanced spectroscopic and photonic applications.