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Zigzag slabs for solid-state laser amplifiers: batch fabrication and parasitic oscillation suppression.

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Researchers developed a high-power Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) amplifier using a novel zigzag slab design. This innovation suppresses parasitic oscillations, boosting efficiency and reducing production costs for wider commercial application.

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Area of Science:

  • Lasers and Photonics
  • Materials Science
  • Optical Engineering

Background:

  • High-power laser systems are crucial for various applications.
  • Nd:YAG lasers are widely used but face challenges in power scaling and efficiency.
  • Existing zigzag slab amplifiers have limitations in parasitic oscillation suppression and production cost.

Purpose of the Study:

  • To develop an efficient 100 W class Nd:YAG master oscillator power amplifier (MOPA) system.
  • To improve parasitic oscillation suppression in end-pumped zigzag slab amplifiers.
  • To reduce the production cost and time for zigzag slab amplifiers.

Main Methods:

  • Development of an end-pumped zigzag slab power amplifier.
  • Implementation of roughened edges for parasitic oscillation suppression.
  • Introduction of a novel cladding technique on slab edges.
  • Establishment of a new batch fabrication process for zigzag slabs.

Main Results:

  • Achieved a small-signal gain coefficient (g(0)l) of 8.06 with roughened edges.
  • The novel cladding technique increased g(0)l to 11.63.
  • Demonstrated a 50% increase in single-pass extracted power.
  • Developed a batch fabrication technique significantly reducing cost and improving quality.

Conclusions:

  • The novel cladding technique effectively suppresses parasitic oscillations, enhancing amplifier performance.
  • The new batch fabrication method addresses commercial limitations by reducing cost and production time.
  • The developed Nd:YAG MOPA system shows significant potential for high-power laser applications.