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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
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...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that stretch at a...

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Related Experiment Video

Updated: Jun 20, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
10:17

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

Characterization of LiB(3)O(5) crystal for second-harmonic generation.

F Xie, B Wu, G You

    Optics Letters
    |September 25, 2009
    PubMed
    Summary

    Lithium Triborate (LBO) crystals achieve high second-harmonic generation efficiency, exceeding 70% with optimized phase-matching lengths. These crystals demonstrate robustness under high power densities, making them suitable for laser applications.

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    Area of Science:

    • Nonlinear Optics
    • Crystallography
    • Laser Physics

    Background:

    • Second-harmonic generation (SHG) is crucial for frequency conversion in lasers.
    • Lithium Triborate (LiB(3)O(5) or LBO) and beta-Barium Borate (beta-BaB(2)O(4) or BBO) are key nonlinear optical crystals.
    • Understanding SHG characteristics is vital for optimizing laser performance.

    Purpose of the Study:

    • To investigate the second-harmonic generation (SHG) properties of LBO crystals.
    • To compare the SHG performance of LBO with BBO crystals.
    • To determine the optimal phase-matching lengths for high SHG conversion efficiency in LBO.

    Main Methods:

    • Numerical interaction method for theoretical SHG efficiency calculations.
    • Experimental measurements of SHG conversion efficiency using a Nd:YAG laser.
    • Systematic variation of LBO crystal phase-matching lengths and fundamental beam power densities.
    • Comparison of theoretical calculations with experimental results.

    Main Results:

    • High energy conversion efficiencies, over 70%, were achieved with LBO crystals at fundamental power densities of several 100 MW/cm(2).
    • Optimal external energy conversion efficiency is dependent on appropriate selection of LBO crystal length.
    • LBO crystals exhibited excellent durability, withstanding high power densities without surface or internal damage.

    Conclusions:

    • LBO is a highly efficient nonlinear optical crystal for second-harmonic generation.
    • Optimized phase-matching length is critical for maximizing SHG conversion efficiency in LBO.
    • LBO's robustness makes it a reliable material for high-power laser systems.