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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
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High-Precision Ramsey-Comb Spectroscopy Based on High-Harmonic Generation.

L S Dreissen1, C Roth1, E L Gründeman1

  • 1LaserLaB, Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, Netherlands.

Physical Review Letters
|November 9, 2019
PubMed
Summary
This summary is machine-generated.

Ramsey-comb spectroscopy using high-harmonic generation (HHG) achieves unprecedented precision for light-based measurements. This technique significantly improves accuracy for atomic transition spectroscopy, paving the way for fundamental physics tests.

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Area of Science:

  • Quantum Optics and Spectroscopy
  • Ultrafast Laser Physics
  • Atomic Physics

Background:

  • High-harmonic generation (HHG) is a key process for converting infrared laser pulses to short wavelengths.
  • Precise spectroscopic measurements are crucial for fundamental physics tests and understanding atomic properties.
  • Existing HHG-based spectroscopy methods have limitations in precision and accuracy.

Purpose of the Study:

  • To demonstrate Ramsey-comb spectroscopy for observing phase effects in high-harmonic generation.
  • To achieve highly accurate spectroscopic measurements using light generated via HHG.
  • To improve the precision of atomic transition measurements.

Main Methods:

  • Utilized Ramsey-comb spectroscopy, employing two ultrafast laser pulses from a frequency-comb laser.
  • Applied the technique to study the 5p^{6}→5p^{5}8s^{2}[3/2]_{1} transition in ^{132}Xe at 110 nm.
  • Achieved phase effect observations with milliradian precision.

Main Results:

  • Performed the most accurate spectroscopic measurement to date based on HHG light.
  • Determined the 110 nm transition in ^{132}Xe with a relative accuracy of 2.3×10^{-10}, improving it by 10^4 times.
  • Achieved a 3.6-fold improvement over previous HHG-based measurements.

Conclusions:

  • Ramsey-comb spectroscopy offers a powerful new tool for high-precision measurements in HHG.
  • The demonstrated accuracy holds significant promise for future fundamental tests, such as 1S-2S spectroscopy of He+.
  • This advancement opens new avenues for exploring atomic structure and fundamental constants with light.