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Updated: Apr 13, 2026
09:39
In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
Published on: May 27, 2013
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Mid-infrared-to-mid-ultraviolet supercontinuum enhanced by third-to-fifteenth odd harmonics
Optics Letters
|May 1, 2015
Summary
Researchers generated a broad supercontinuum spectrum using a mid-infrared driver, enhancing its high-frequency range with optical harmonics. This technique broadens spectral peaks due to ionization effects, verified by numerical modeling.
Area of Science:
- Nonlinear Optics
- Laser Physics
- Spectroscopy
Background:
- Supercontinuum generation is crucial for various spectroscopic applications.
- Mid-infrared (MIR) drivers offer unique advantages for nonlinear optical processes.
Purpose of the Study:
- To generate a high-energy, broadband supercontinuum using a MIR optical parametric chirped-pulse amplifier (OPCPA).
- To investigate the enhancement of the supercontinuum's high-frequency wing via optical harmonics.
- To analyze the spectral broadening mechanisms, including ionization-induced blueshift.
Main Methods:
- Utilizing a 0.3-TW, 3.9-μm MIR OPCPA as the driver laser.
- Inducing laser filamentation in ambient air for supercontinuum generation.
- Observing and analyzing optical harmonics up to the 15th order.
- Employing numerical modeling to verify spectral broadening mechanisms.
Main Results:
- Generation of a supercontinuum spanning 4.7 octaves (250–6500 nm).
- Enhancement of the supercontinuum's high-frequency wing by odd-order optical harmonics.
- Observation of well-resolved, broadened harmonic peaks attributed to spatially nonuniform ionization-induced blueshift.
Conclusions:
- A high-energy supercontinuum can be effectively generated and controlled using MIR OPCPA drivers.
- Optical harmonic generation plays a significant role in extending the supercontinuum spectrum to higher frequencies.
- Ionization dynamics significantly influence spectral broadening in laser-induced filaments.
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