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Updated: Jul 29, 2025

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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
Published on: December 18, 2015
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Passively CEP stable sub-2-cycle source in the mid-infrared by adiabatic difference frequency generation
Optics Letters
|May 24, 2023
Summary
We generated a stable, sub-2-cycle mid-infrared pulse using adiabatic difference frequency generation. This method achieves carrier-envelope phase (CEP) stability, crucial for advanced optical applications.
Area of Science:
- Quantum Optics
- Nonlinear Optics
- Ultrafast Lasers
Background:
- Carrier-envelope phase (CEP) stability is critical for precision in ultrafast laser applications.
- Generating few-cycle pulses in the mid-infrared presents significant challenges.
Purpose of the Study:
- To demonstrate a passive method for generating CEP-stable few-cycle pulses in the mid-infrared.
- To characterize the CEP stabilization performance of adiabatic downconversion.
Main Methods:
- Adiabatic difference frequency generation (ADFG) for pulse downconversion.
- Material-based pulse compression to achieve sub-2-cycle durations.
- Measurement of carrier-envelope phase (CEP) stability.
Main Results:
- Generation of a 1.7-cycle pulse in the mid-infrared with ADFG.
- Achieved a sub-2-cycle, 16-fs pulse at 2.7 µm using material compression.
- Measured a carrier-envelope phase (CEP) stability of <190 mrad root mean square.
Conclusions:
- Adiabatic downconversion offers a viable route to passive CEP stabilization in the mid-infrared.
- The demonstrated technique enables the generation of high-quality, few-cycle mid-infrared pulses.
- This work characterizes CEP stabilization for adiabatic downconversion for the first time.
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