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Diode laser: fundamentals and improving the brightness

Diode laser: fundamentals and improving the brightness

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This chapter is dedicated to briefly looking back at the evolution of rise of a disruptive technology and surveying the current challenges and roadblocks to improving brightness as well as understanding the current state-of-the-art of diode lasers followed by a summary of outlook of its brightness improvement.

Chapter Contents:

  • 1.1 A brief history of high-power semiconductor laser: the rise of a disruptive technology
  • 1.1.1 The beginning of a semiconductor laser
  • 1.1.2 Era of high-temperature operation—birth of quantum-well gain medium
  • 1.1.3 Era of high-reliability operation
  • 1.1.4 Race for super high efficiency for defense application
  • 1.1.5 Era of high brightness—the rise of a disruptive technology
  • 1.2 High power and high brightness broad area diode lasers
  • 1.2.1 Fundamentals of diode lasers
  • 1.2.2 Optical gain medium—quantum well
  • 1.2.3 Optical waveguide
  • 1.2.4 Optical feedback
  • 1.2.5 Electrical-to-optical power conversion efficiency
  • 1.3 Mitigation of slow-axis divergence blooming in broad area diode lasers
  • 1.3.1 Why brightness degrades as BPP increases
  • 1.3.2 The origin of slow-axis divergence blooming in high-power diode lasers
  • 1.3.3 Mitigating slow-axis divergence blooming
  • Reducing junction temperature via thermal management
  • Reducing thermal gradient across the stripe-width
  • Reducing the divergence by suppressing higher-order modes
  • 1.3.4 Fiber-coupled multi-single-emitter diode lasers
  • 1.3.5 Reliability of fiber-coupled multi-single-emitter diodes
  • 1.4 Diode laser applications
  • 1.4.1 Diode-pumped solid-state lasers and fiber lasers
  • 1.4.2 Markets and applications
  • 1980s: optical storage and initial niche applications
  • 1990s: optical networking boom
  • 2000s: laser as a tool
  • 1.5 The future prospects of diode lasers
  • 1.5.1 Increasing power and efficiency
  • 1.5.2 Reducing slow-axis BPP and increasing fast-axis brightness
  • 1.5.3 Increasing submount thermal conductivity
  • 1.5.4 Improving optical coupling scheme
  • Acknowledgments
  • References

Inspec keywords: laser beam applications; semiconductor lasers; brightness; laser beams

Other keywords: diode laser

Subjects: Laser applications; Textbooks; Laser applications; Laser beam characteristics and interactions; Semiconductor lasers; Laser beam interactions and properties; Lasing action in semiconductors; Design of specific laser systems

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