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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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High-efficiency pulse compression with intracavity Raman oscillators.

R Frey, A de Martino, F Pradère

    Optics Letters
    |September 1, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Intracavity Raman oscillators achieve high-efficiency pulse compression by extracting laser energy at the Stokes frequency. This technique shortens ruby laser pulse durations significantly, offering benefits for various laser types.

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    Area of Science:

    • Laser Physics
    • Nonlinear Optics

    Background:

    • High-efficiency pulse compression is crucial for advanced laser applications.
    • Traditional methods face limitations with certain laser types.

    Purpose of the Study:

    • To demonstrate high-efficiency pulse compression using an intracavity Raman oscillator.
    • To investigate the effectiveness of this technique for short-pulse lasers.

    Main Methods:

    • Utilized an intracavity Raman oscillator with a high-Q cavity for primary laser energy storage.
    • Employed a Stokes laser with high Raman gain and a low-Q cavity for energy extraction at the Stokes frequency.
    • Used hydrogen gas as the Raman medium.

    Main Results:

    • Achieved high-efficiency pulse compression.
    • Shortened the pulse duration of a ruby laser by a factor of 6.7.
    • Obtained an 87% effective quantum efficiency.

    Conclusions:

    • Intracavity Raman oscillators provide an effective method for high-efficiency pulse compression.
    • This technique is particularly advantageous for low-gain lasers like alexandrite and those with short storage lifetimes.