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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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All-periodically poled, high-power, continuous-wave, single-frequency tunable UV source.

A Aadhi, Apurv Chaitanya N, M V Jabir

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    Summary
    This summary is machine-generated.

    We developed a high-power, single-frequency ultraviolet (UV) source using optical parametric oscillator technology. This compact device offers tunable UV radiation, achieving up to 336 mW of power for various applications.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Quantum Optics

    Background:

    • Continuous-wave (CW) high-power, single-frequency ultraviolet (UV) sources are crucial for numerous scientific and technological applications.
    • Existing UV generation methods often face limitations in power, tunability, or spectral purity.
    • Periodically poled materials have enabled significant advancements in nonlinear optical frequency conversion.

    Purpose of the Study:

    • To experimentally demonstrate a novel, compact, high-power, single-frequency UV source.
    • To achieve tunable UV radiation via internal second-harmonic-generation (SHG) of a CW singly resonant optical parametric oscillator (SRO).
    • To characterize the performance and efficiency of the developed UV source.

    Main Methods:

    • Utilized a CW singly resonant optical parametric oscillator (SRO) pumped in the green spectral region.
    • Employed internal second-harmonic-generation (SHG) using a multi-grating periodically poled potassium titanium phosphate (PPKTP) crystal.
    • Integrated a MgO-doped periodically poled stoichiometric lithium tantalate (MgO:sPPLT) crystal for the OPO cavity.

    Main Results:

    • Generated tunable UV radiation across the 398.94–417.08 nm range.
    • Achieved a maximum UV output power of 336 mW at 398.94 nm with a green-to-UV conversion efficiency of approximately 6.7%.
    • Delivered single-frequency UV radiation with a linewidth of ~18.3 MHz and a Gaussian beam profile (>92% ellipticity).

    Conclusions:

    • Successfully demonstrated a compact, high-power, single-frequency, tunable UV source based on internal SHG of a CW SRO.
    • The source provides substantial UV power and excellent beam quality across its tuning range.
    • The study highlights the potential of periodically poled materials for efficient UV generation.