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Two-optical-cycle pulses from nanophotonic two-color soliton compression
Robert M Gray1, Ryoto Sekine1, Maximilian Shen1
1Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, USA.
Light, Science & Applications
|February 6, 2026
Summary
Researchers demonstrate two-optical-cycle pulse compression using lithium niobate nanophotonics. This breakthrough enables efficient generation of ultrashort optical pulses, paving the way for integrated ultrafast photonics.
Area of Science:
- Photonics and Ultrafast Science
- Integrated Optics
- Nonlinear Optics
Background:
- Few- and single-cycle optical pulses are vital for ultrafast science.
- Current methods require bulky, expensive tabletop systems, limiting integrated photonics.
- Multi-color waveforms offer advantages in pulse synthesis and attosecond science.
Purpose of the Study:
- To overcome limitations in ultrashort pulse generation and control.
- To demonstrate two-optical-cycle pulse compression in nanophotonics.
- To enable on-chip single-cycle pulse synthesis with sub-cycle control.
Main Methods:
- Utilizing quadratic two-color soliton dynamics in lithium niobate nanophotonics.
- Employing dispersion engineering and phase matching.
- Leveraging nonlinear optical processes for pulse compression.
Main Results:
- Achieved extreme pulse compression and energy-efficient operation.
- Demonstrated generation of ~13 fs pulses at 2 µm with ~3 pJ input energy.
- Showcased strong pump-to-second-harmonic conversion.
Conclusions:
- The demonstrated scheme enables two-optical-cycle pulse compression in nanophotonics.
- The method is extendable to on-chip single-cycle pulse synthesis.
- Provides a pathway for realizing compact, integrated single-cycle ultrafast systems.
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