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Intense and Superflat White Laser with 700-nm 3-dB Bandwidth and 1-mJ Pulse Energy Enabling Single-Shot Subpicosecond
Lihong Hong1, Haiyao Yang1, Liqiang Liu1
1School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, China.
Research (Washington, D.C.)
|August 17, 2023
Summary
Researchers developed an ultrabroadband white-light laser for ultrafast spectroscopy. This new laser enables single-shot measurement of atomic and molecular absorption spectra, advancing the study of dynamic processes.
Area of Science:
- Physics
- Chemistry
- Spectroscopy
Background:
- Optical spectrometers are essential for probing material properties but struggle with broadband time-resolved measurements.
- Ultrafast dynamics of physical and chemical processes require advanced spectroscopic tools.
Purpose of the Study:
- To create an ultrabroadband, high-energy, femtosecond white-light laser source.
- To develop a single-shot subpicosecond ultraviolet-visible-near-infrared spectrometer.
Main Methods:
- Generated ultrabroadband white-light by focusing a Ti:Sapphire laser through cascaded fused silica plates and a chirped periodically poled lithium niobate crystal.
- Utilized the generated laser to construct a single-shot ultrafast spectrometer.
Main Results:
- Achieved an ultrabroadband white-light laser with a 3-dB bandwidth from 385 to 1,080 nm.
- Obtained a pulse energy of 1.07 mJ and a pulse duration of several hundred femtoseconds.
- Successfully measured atomic and molecular absorption spectra using the single-shot spectrometer.
Conclusions:
- The developed ultrabroadband laser and single-shot spectrometer offer unprecedented capabilities for ultrafast measurements.
- This technology may enable simultaneous monitoring of multiple ultrafast physical and chemical processes.
- Opens new frontiers in studying microscopic systems with high temporal resolution.
