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Updated: Aug 12, 2025
08:22
Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
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An oscillator-driven, time-resolved optical pump/NIR supercontinuum probe spectrometer
Optics Letters
|February 1, 2023
Summary
We developed a new time-resolved spectrometer for oscillators. This instrument uses a novel optical pump/NIR supercontinuum probe for precise measurements with high spectral and temporal resolution.
Area of Science:
- Spectroscopy
- Optical Physics
- Materials Science
Background:
- Time-resolved spectroscopy is crucial for understanding dynamic processes in materials.
- Existing techniques often face limitations in resolution or complexity.
Purpose of the Study:
- To present a novel time-resolved optical pump/NIR supercontinuum probe spectrometer.
- To enable high-resolution measurements on oscillators.
Main Methods:
- Generation of a near-infrared (NIR) supercontinuum probe spectrum (850-1250 nm) in photonic crystal fiber.
- Dispersion of the probe spectrum across a digital micromirror device (DMD) for raster scanning.
- Simultaneous measurement of reflectance (R) and photoinduced change (ΔR) using dual modulation and lock-in detection for self-normalized ΔR/R.
Main Results:
- Demonstrated capability for measuring signals of order ΔR/R ~ 10⁻³.
- Achieved 2.87 nm spectral resolution and sub-400 fs temporal resolution (pre-recompression).
- Exhibited sensitivity comparable to standard time-resolved amplifier-based pump-probe techniques.
Conclusions:
- The developed spectrometer is a novel, knowledge-advancing tool for oscillator research.
- It offers high spectral and temporal resolution with excellent sensitivity.
- This technique provides a valuable alternative for time-resolved pump-probe studies.
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