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Tunable, single-frequency, and multi-watt continuous-wave Cr2+:ZnSe lasers.

I S Moskalev1, V V Fedorov, S B Mirov

  • 1Univ. of Alabama at Birmingham, Department of Physics, 310 Campbell Hall, 1300University Blvd., Birmingham, AL 35294, USA.

Optics Express
|June 11, 2008
PubMed
Summary

This study presents advanced chromium-doped zinc selenide (Cr2+:ZnSe) lasers, achieving rapid tuning, high power, and high efficiency across various configurations for diverse laser applications.

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Area of Science:

  • Laser Physics
  • Materials Science
  • Optical Engineering

Background:

  • Chromium-doped zinc selenide (Cr2+:ZnSe) is a promising gain medium for mid-infrared lasers.
  • Developing high-performance Cr2+:ZnSe lasers is crucial for applications requiring tunable, high-power sources.

Purpose of the Study:

  • To demonstrate various configurations of Cr2+:ZnSe lasers with enhanced performance characteristics.
  • To explore the potential of different Cr2+:ZnSe material forms (single-crystal, polycrystalline, ceramic) for laser development.

Main Methods:

  • Fabrication and characterization of single-crystalline, polycrystalline, and hot-pressed ceramic Cr2+:ZnSe lasers.
  • Continuous-wave (CW) laser operation under optical pumping.
  • Performance evaluation including tuning range, output power, spectral properties, and efficiency.

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Main Results:

  • Demonstrated a single-crystalline Cr2+:ZnSe laser with rapid tunability (4.5 µm/s), high power (150 mW), and single-longitudinal mode operation (120 MHz).
  • Achieved CW widely-tunable (2.12–2.77 µm) polycrystalline Cr2+:ZnSe lasers with multi-watt output (2 W).
  • Developed highly efficient (48% real efficiency) multi-watt (6 W) polycrystalline and ultra-compact (3 W) Cr2+:ZnSe lasers.
  • Successfully operated a CW hot-pressed ceramic Cr2+:ZnSe laser.

Conclusions:

  • Cr2+:ZnSe lasers offer versatile platforms for generating high-performance mid-infrared radiation.
  • Different material processing techniques yield distinct laser characteristics, enabling tailored solutions.
  • The demonstrated lasers pave the way for advanced applications in spectroscopy, sensing, and free-space communications.