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High-speed femtosecond pump-probe spectroscopy with a smart pixel detector array.
S Bourquin1, R P Prasankumar, F X Kärtner
1Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. bourquin@mit.edu
Optics Letters
|September 6, 2003
Summary
A novel femtosecond pump-probe spectroscopy method uses a smart pixel detector for high-speed, multi-wavelength data acquisition. This technique enables rapid, sensitive measurements across numerous wavelengths, advancing condensed matter, chemistry, and biology research.
Area of Science:
- Spectroscopy
- Materials Science
- Physical Chemistry
Background:
- Femtosecond pump-probe spectroscopy is crucial for studying ultrafast dynamics.
- Traditional methods can be time-consuming and limited in wavelength coverage.
- Need for faster, more versatile spectroscopic techniques exists.
Purpose of the Study:
- To demonstrate a new femtosecond pump-probe spectroscopy technique.
- To enable high-speed, parallel acquisition of measurements at multiple wavelengths.
- To achieve rapid time- and wavelength-resolved spectroscopy.
Main Methods:
- Utilized a novel two-dimensional smart pixel detector array.
- The detector performs real-time amplitude demodulation on each pixel.
- Simultaneous demodulation of probe transmission signals at multiple wavelengths.
Main Results:
- Achieved sensitivities comparable to lock-in amplification.
- Successfully performed measurements across 58 simultaneous wavelengths on bulk GaAs.
- Measured differential probe transmission changes as small as 2 x 10(-4) in approximately 3 minutes over a 5-ps delay scan.
Conclusions:
- The new technique allows for rapid, wavelength-resolved femtosecond pump-probe spectroscopy.
- Demonstrated high sensitivity and speed for ultrafast measurements.
- Applicable to diverse fields including condensed matter, chemistry, and biology.