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Ultrafast watt-level fiber-feedback multipassoptical parametric oscillator
Optics Letters
|July 31, 2026
Summary
We developed a high-gain, single-stage optical parametric oscillator (OPO) in a fiber-feedback cavity. This tunable ultrashort pulse source achieves watt-scale power without additional amplification, reducing size and cost for applications like spectroscopy.
Area of Science:
- Nonlinear Optics
- Laser Physics
- Quantum Optics
Background:
- Optical parametric oscillators (OPOs) are versatile sources for ultrashort pulses.
- A limitation is the need for post-amplification stages for power scaling due to low single-pass gain.
Purpose of the Study:
- To implement a high-gain, single-stage tunable ultrashort pulse source.
- To overcome the limitations of traditional OPOs requiring post-amplification.
Main Methods:
- Utilized a multipass optical parametric oscillator design.
- Incorporated a fiber-feedback cavity for enhanced gain.
- Demonstrated tunability and shot-noise limited performance.
Main Results:
- Achieved tunability from 1.4 µm to 1.85 µm.
- Generated 100 fs pulses with watt-scale average powers.
- Operated at a repetition rate of 76 MHz with shot-noise limited performance.
Conclusions:
- The developed OPO is a compact, cost-effective, single-stage tunable ultrashort pulse source.
- Eliminates the need for additional amplification or compression stages.
- Enables reduced size and cost for spectroscopy and bioimaging applications.
