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Low-threshold upconverted single-mode lasing from CdS hexagonal microcavities.

Yang Mi1, Lei Kong1, Yaoyao Wu1

  • 1Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan, People's Republic of China.

Nanotechnology
|January 21, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed low-threshold upconversion lasers using cadmium sulfide (CdS) microplatelets. These novel lasers demonstrate tunable single-mode emission and improved efficiency, paving the way for advanced photonic devices.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Quantum Electronics

Background:

  • Upconversion micro/nanolasers are crucial for fundamental physics and applications.
  • Existing upconversion lasers face limitations in gain medium and cavity quality, leading to high lasing thresholds.

Purpose of the Study:

  • To achieve efficient upconverted whispering-gallery-mode lasing from cadmium sulfide (CdS) microplatelets.
  • To investigate the lasing properties, including threshold, tunability, and size-dependent behavior.

Main Methods:

  • Utilized two-photon absorption in CdS microplatelets to achieve upconverted lasing.
  • Investigated whispering-gallery-mode (WGM) lasing characteristics.
  • Performed numerical simulations to verify experimental results.
  • Studied the effect of microplatelet size on lasing behavior.

Main Results:

  • Achieved single-mode upconverted WGM lasing with a low threshold of ~1.2 mJ cm⁻².
  • Demonstrated wavelength-tunable lasing from 510.4 to 518.9 nm with narrow linewidths (~0.85 nm).
  • Observed size-dependent lasing, with thresholds decreasing quadratically with increasing cavity edge length (Pth ∝ 1/L²).

Conclusions:

  • CdS microplatelets offer a promising platform for developing low-threshold, tunable upconversion lasers.
  • The demonstrated control over lasing modes and thresholds highlights their potential for chip-level photonic integration.
  • These findings advance the development of efficient frequency upconversion devices.