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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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Measuring temporally complex ultrashort pulses using multiple-delay crossed-beam spectral interferometry.

Jacob Cohen1, Pamela Bowlan, Vikrant Chauhan

  • 1Georgia Institute of Technology, School of Physics 837 State St, Atlanta, GA 30332, USA. jcohen7@gatech.edu

Optics Express
|April 15, 2010
PubMed
Summary

We developed a spectral-interferometry (SI) technique to measure complex ultrashort pulses without high-resolution spectrometers. This method uses multiple measurements to achieve high spectral resolution, overcoming traditional limitations.

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Area of Science:

  • Ultrafast optics
  • Nonlinear optics
  • Quantum optics

Background:

  • Measuring ultrashort pulses is crucial for understanding light-matter interactions.
  • Conventional methods often require expensive, high-resolution spectrometers.
  • Characterizing complex pulse shapes and phases remains a challenge.

Purpose of the Study:

  • To introduce a novel spectral-interferometry (SI) technique for complete ultrashort pulse characterization.
  • To overcome the need for high-resolution spectrometers in pulse measurement.
  • To enable the measurement of long and complex ultrashort optical pulses.

Main Methods:

  • Utilized spectral-interferometry (SI), specifically the SEA-TADPOLE variation.
  • Performed multiple measurements at various temporal delays to capture pulse segments (pulselets).
  • Concatenated measured pulselets to reconstruct the complete pulse intensity and phase information.

Main Results:

  • Achieved a spectral resolution significantly higher than the spectrometer's intrinsic resolution (inverse of the delay range).
  • Demonstrated a proof-of-principle implementation with 71 fs temporal resolution.
  • Successfully measured pulses over a 100 ps temporal range using a low-resolution spectrometer.

Conclusions:

  • The developed SI technique offers a cost-effective and high-resolution alternative for ultrashort pulse characterization.
  • This method is suitable for analyzing complex and relatively long ultrashort pulses.
  • The approach bypasses the limitations of traditional spectrometer-based measurements.