Femtosecond fiber-feedback optical parametric oscillator

Area of Science:

• Photonics and Laser Technology
• Nonlinear Optics
• Optical Engineering

Background:

• Synchronously pumped optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
• Traditional OPO designs often require complex and sensitive cavity stabilization.
• Integrating fiber optics into OPO resonators presents an opportunity for miniaturization and simplified operation.

Purpose of the Study:

• To demonstrate the first synchronously pumped high-gain optical parametric oscillator (OPO) utilizing single-mode fiber feedback.
• To achieve tunable, ultrashort pulse generation with high signal power in a compact setup.
• To investigate the impact of fiber feedback on OPO stability and performance.

Main Methods:

• Utilized a periodically poled LiTaO3 crystal for high parametric gain.
• Employed a passively mode-locked Yb:YAG laser delivering 600-fs pulses at 1030 nm as the pump source.
• Incorporated a standard telecom single-mode fiber for resonator feedback, enabling synchronous pumping.

Main Results:

• Achieved 2.3–2.7 W of signal power in 700–900-fs pulses.
• Demonstrated tunability across the 1429–1473 nm wavelength range.
• The fiber-feedback design resulted in a compact and robust OPO system, insensitive to intracavity losses and eliminating the need for active cavity length stabilization.

Conclusions:

• The fiber-feedback OPO represents a significant advancement in laser technology, offering a compact and stable solution for tunable ultrashort pulse generation.
• The high parametric gain achieved simplifies OPO construction and operation, making it more accessible.
• This technology has potential applications in spectroscopy, optical communications, and other fields requiring tunable laser sources.