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Continuously tunable multiple-order stimulated four-photon mixing in a multimode silica fiber
Optics Letters
|September 2, 2009
Summary
Stimulated four-photon mixing (SFPM) was observed in a long multimode fiber. This process allowed for continuous tuning of generated light lines within the Raman-gain spectrum.
Area of Science:
- Nonlinear Optics
- Fiber Optics
- Laser Physics
Background:
- Stimulated four-photon mixing (SFPM) is a key nonlinear optical process.
- Multimode fibers offer unique waveguiding properties for nonlinear phenomena.
- Achieving phase-matching in multimode fibers is crucial for efficient SFPM.
Purpose of the Study:
- To investigate stimulated four-photon mixing (SFPM) in a long multimode silica fiber.
- To demonstrate continuous tuning of SFPM-generated light.
- To explore the potential of multimode fibers for nonlinear frequency conversion.
Main Methods:
- Utilized a 300-m-long, low-loss, large-core multimode silica fiber.
- Employed a dual-frequency dye laser as the pump source.
- Observed SFPM up to four orders by tuning the frequency separation of the laser lines.
Main Results:
- SFPM was successfully observed up to four orders in the multimode fiber.
- Phase-matching for SFPM was achieved without critical alignment.
- Continuous tuning of an intense SFPM line was demonstrated from 350 to 495 cm(-1) under the Raman-gain curve.
Conclusions:
- Multimode fibers can efficiently support high-order stimulated four-photon mixing.
- The demonstrated tuning capability opens possibilities for tunable light generation.
- SFPM in multimode fibers offers a versatile platform for nonlinear spectroscopy and photonics.
