Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Cascaded Volume Bragg Grating for Narrow Spectral Linewidth in High-power Laser Diodes

  • Lee, Dong-Jin (Department of Information and Communication Engineering, Inha University) ;
  • Shim, Gyu-Beom (Department of Information and Communication Engineering, Inha University) ;
  • Jeong, Ji-Hun (Department of Information and Communication Engineering, Inha University) ;
  • O, Beom-Hoan (Department of Information and Communication Engineering, Inha University)
  • Received : 2021.12.10
  • Accepted : 2022.03.11
  • Published : 2022.06.25
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Abstract

Narrowing the spectral linewidth and improving the wavelength stability of high-power laser diodes (HPLDs) are both in high demand for rapidly maturing industrial laser applications. In this study, we investigate the spectral behavior of a commercial HPLD bar module composed of 19 laser diodes (LDs) in a single-layered bar with a built-in volume Bragg grating (VBG) and an additional cascaded VBG. Optical loss due to the extra cascaded VBG is kept below 5% when the optical output is 5 W or more. The full width at half maximum of the Fabry-Perot peak from the cascaded VBG is reduced to about 12.4% and 29.1% at the edge (1st LD) and center (10th LD) of the HPLD bar module respectively, compared to using only a built-in VBG at an optical power of 10 W or more. In addition, fine wavelength tuning is achieved by temperature control of the extra VBG, and the obtained wavelength-tuning range amounts to about 10.6 pm/K.

Keywords

Acknowledgement

Research Fund for the High Efficiency Laser Laboratory of the Agency for Defense Development of Korea (No. UD190015ID).

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