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Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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Highly coherent supercontinuum generation with picosecond pulses by using self-similar compression.
Optics Express
|November 18, 2014
Summary
Researchers improved supercontinuum (SC) generation by first compressing picosecond pump pulses in a nonlinearity increasing fiber. This novel method significantly enhances the coherence of the generated SC, overcoming a key limitation in optical systems.
Area of Science:
- Nonlinear Optics
- Fiber Optics
- Laser Physics
Background:
- Low coherence of supercontinuum (SC) generated with picosecond pump pulses is a significant limitation.
- Existing SC generation schemes struggle with pulse coherence, impacting applications.
- Need for methods to improve SC coherence using readily available picosecond lasers.
Purpose of the Study:
- To propose and validate a novel method for generating highly coherent supercontinuum (SC).
- To overcome the low coherence drawback associated with picosecond pump pulses in SC generation.
- To enhance the noise tolerance for SC generation using picosecond pulses.
Main Methods:
- Self-similar pulse compression of high-power picosecond pump pulses using a nonlinearity increasing fiber (NIF).
- Fabrication of NIF by tapering a large mode area photonic crystal fiber, controlling nonlinearity via pitch size.
- Numerical simulations using the generalized nonlinear Schrödinger equation to model pulse compression and SC generation.
Main Results:
- Successfully compressed a 1 ps pump pulse down to 53.6 fs with negligible pedestal and reduced noise.
- Demonstrated self-similar compression of noisy picosecond pulses in the NIF.
- Achieved highly coherent SC generation in a non-zero dispersion-shifted fiber (NZ-DSF) using the compressed pulse.
Conclusions:
- The proposed scheme significantly enhances the coherence of SC generated from picosecond pump pulses.
- The noise tolerance for highly coherent SC generation is improved by 5 orders of magnitude.
- This technique offers a viable solution for producing high-quality SC for various optical applications.
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