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Optical cooling in Er3+:KPb2Cl5.

Nicholas J Condon1, Steven R Bowman, Shawn P O'Connor

  • 1Optical Sciences Division, U.S. Naval Research Laboratory, Washington, DC 20375, USA. nicholas.condon@nrl.navy.mil

Optics Express
|April 1, 2009
PubMed
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This summary is machine-generated.

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Optical cooling was achieved in erbium(III) using potassium lead chloride. This breakthrough demonstrates potential for eye-safe lasers operating in the infrared spectrum.

Area of Science:

  • Materials Science
  • Optics and Photonics
  • Quantum Electronics

Background:

  • Optical cooling, or laser cooling, is a technique used to reduce the temperature of a material.
  • Erbium(III) ions are known for their luminescence properties in the telecommunication wavelength range.
  • Low phonon energy host materials are desirable for efficient optical cooling.

Purpose of the Study:

  • To investigate optical cooling in the (4)I(13/2) excited state of erbium(III).
  • To explore the potential of potassium lead chloride (KPb(2)Cl(5)) as a host material for optical cooling.
  • To assess the feasibility of Er(3+):KPb(2)Cl(5) for eye-safe laser applications.

Main Methods:

  • Experimental observation of optical cooling in Er(3+):KPb(2)Cl(5) samples.

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  • Pumping the material at specific wavelengths longer than its mean fluorescence wavelength.
  • Measuring cooling efficiency based on absorbed power.

    • Main Results:

    • Optical cooling was successfully observed in the (4)I(13/2) excited state of erbium(III) for the first time.
    • Cooling occurred when pumped at wavelengths exceeding 1557 nm.
    • A total cooling efficiency of 0.38% of absorbed power was achieved when pumped at 1568 nm.

    Conclusions:

    • Er(3+):KPb(2)Cl(5) exhibits optical cooling properties.
    • The material shows promise for developing eye-safe lasers.
    • This study advances the understanding of optical cooling in rare-earth-doped materials.