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Efficient 1645-nm Er:YAG laser.

York E Young1, Scott D Setzler, Kevin J Snell

  • 1BAE Systems, Information and Electronic Warfare, Nashua, New Hampshire 03061, USA. york.young@baesystems.com

Optics Letters
|June 9, 2004
PubMed
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Researchers developed a high-efficiency, high-power Er:YAG laser emitting eye-safe 1645 nm light. This bulk solid-state laser achieved record performance, demonstrating its potential for various applications.

Area of Science:

  • Laser physics
  • Solid-state lasers
  • Photonics

Background:

  • Erbium-doped Yttrium Aluminum Garnet (Er:YAG) lasers are crucial for applications requiring eye-safe wavelengths.
  • Previous bulk solid-state Er:YAG lasers have faced limitations in efficiency and output power.

Purpose of the Study:

  • To develop a highly efficient and powerful bulk solid-state Er:YAG laser.
  • To achieve optimal performance using resonant fiber-laser pumping.
  • To demonstrate the laser's utility through frequency doubling.

Main Methods:

  • Resonant pumping of an Er:YAG crystal using a fiber laser.
  • Q-switching technique for pulsed operation at 10 kHz.
  • Frequency doubling of the output to 822.5 nm.

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Main Results:

  • Achieved 43% optical efficiency and 54% incident slope efficiency.
  • Emitted 7-W average power at 1645 nm.
  • Produced 3.4-mJ pulses with 162 kW peak power at 1.1 kHz.
  • Demonstrated frequency doubling to 822.5 nm with 4.7 kW peak power.

Conclusions:

  • This work presents the best performance to date for a bulk solid-state Q-switched erbium laser in terms of conversion efficiency and average power.
  • The developed laser system shows significant potential for applications requiring high-power, eye-safe laser sources.
  • The demonstrated frequency doubling highlights the versatility of the Er:YAG laser platform.