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Noise-like pulse generation around 1.3-µm based on cascaded Raman scattering.
Optics Express
|May 15, 2020
Summary
Researchers developed near-infrared noise-like pulses (NLPs) using cascaded Raman scattering in a Yb-doped fiber amplifier. These NLPs are effective for studying perovskite photoluminescence and reabsorption effects.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Cascaded Raman scattering is a key nonlinear optical process for generating new wavelengths.
- Near-infrared (NIR) light sources are crucial for various spectroscopic applications, including materials characterization.
Purpose of the Study:
- To demonstrate the generation of NIR noise-like pulses (NLPs) using a Yb-doped fiber amplifier system.
- To investigate the application of these generated NLPs as a light source for studying perovskite photoluminescence.
Main Methods:
- Utilizing cascaded Raman scattering in a germanium-zirconia-silica Yb3+-doped single mode fiber amplifier.
- Exciting the fourth-order Stokes wave (4th-SW) to achieve emission peaks around 1.2 µm with a 130 nm bandwidth.
- Employing filtered NLPs seeded at 1075 nm to excite the fifth-order Stokes wave (5th-SW) for efficient wavelength shifting towards 1.3 µm.
Main Results:
- Successfully generated NIR NLPs with tunable emission peaks.
- Achieved efficient wavelength extension towards 1.3 µm by exciting higher-order Stokes waves.
- Demonstrated the utility of the generated NLPs for exciting perovskite photoluminescence via three-photon absorption.
Conclusions:
- The Yb-doped fiber amplifier system effectively generates NIR NLPs through cascaded Raman scattering.
- The generated NLPs are suitable for probing material properties, evidenced by the observation of redshift in perovskite emission due to reabsorption.
- This work offers a promising NIR light source for advanced optical spectroscopy and material analysis.
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