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2 July 2020 Prism-based tunable InGaN/GaN self-injection locked blue laser diode system: study of temperature, injection ratio, and stability
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Abstract

A quasicontinuously wavelength tuned self-injection locked blue laser diode system employing a prism is presented. A rigorous analysis of the injection ratio (IR) in the form of three systems, namely high (HRS, ∼  −  0.7  dB IR), medium (MRS, ∼  −  1.5  dB IR), and low (LRS, ∼  −  3.0  dB IR) reflection systems, showed a direct relationship with the wavelength tunability whereas the usable system power exhibited an inverse correlation. In particular, MRS configuration demonstrated a concurrent optimization of tuning window and system power, thus emerging as a highly attractive candidate for practical realization. Moreover, a comprehensive investigation on two distinct MRS configurations employing different commercially available InGaN/GaN blue lasers, i.e., MRS-1 and MRS-2, displayed a wavelength tunability (system power) of ∼8.2  nm (∼7.6  mW) and ∼6.3  nm (∼11.6  mW), respectively, at a low injection current of 130 mA. In addition, both MRS configurations maintained high-performance characteristic with corresponding average optical linewidths of ∼80 and ∼58  pm and a side-mode-suppression-ratio of ≥12  dB. Lastly, a thorough stability analysis of HRS and MRS configurations, which are more prone to system instabilities due to elevated IRs, is performed at critical operation conditions of a high injection current of ≥260  mA and a temperature of 40°C, showing an extended stable performance of over 120 min, thus further substantiating the promising features of the prism-based systems for practical applications.

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 1934-2608/2020/$28.00 © 2020 SPIE
Mohammed Z. M. Khan, Sani Mukhtar, Jorge A. Holguín-Lerma, Omar Alkhazragi, Islam Ashry, Tien K. Ng, and Boon S. Ooi "Prism-based tunable InGaN/GaN self-injection locked blue laser diode system: study of temperature, injection ratio, and stability," Journal of Nanophotonics 14(3), 036001 (2 July 2020). https://doi.org/10.1117/1.JNP.14.036001
Received: 6 May 2020; Accepted: 17 June 2020; Published: 2 July 2020
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