Abstract

With development of high power GaN laser diode (LD) and Bragg gratings writing in fluoride glass and fibers, it's necessary and important to develop a numerical model for visible down conversion Pr $^{3+}$-doped fiber (PDF) lasers based on GaN LD and fiber Bragg gratings (FBGs) to optimize its performance for practical use. We propose a numerical model to investigate both steady state and $Q$-switching dynamics of a visible down conversion PDF lasers. FBGs are placed at both ends of PDF to form a linear cavity. First, the effect of fiber length, boundary reflectivity and the doping concentration on the output power at steady state was obtained and analyzed. The simulation result at steady state qualitatively agree well with previous experimental demonstrations and the FBG based cavity exhibits advantages over conventional PDF system in terms of low threshold and high slope efficiency. After that, by modulating the reflecting spectrum of FBG by using a piezoelectric transducer, $Q$-switched pulse behavior has been established to illustrate the impact of FBG feedback, pulse repetition frequency (PRF), pumping power, boundary reflectivity and the doping concentration on pulse shape and pulse characteristics. The larger gain factor is found to be the main reason to explain obvious multipeaks, spurious pulses, and considerable energy leakage in red color $Q$-switching process. Methods to mitigate above mentioned phenomenon have been proposed and demonstrated in this paper.

© 2013 IEEE

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2011 (2)

2010 (1)

J. Nakanishi, T. Yamada, Y. Fujimoto, O. Ishii, M. Yamazaki, "High-power red laser oscillation of 311.4 mW in Pr $^{3+}$ -doped waterproof fluoro-aluminate glass fibre excited by GaN laser diode," Electron. Lett. 46, 1285-1286 (2010).

2009 (2)

X. P. Cheng, P. Shum, M. Tang, R. Wu, "Numerical analysis and characterization of fiber bragg grating-based Q-switched ytterbium-doped double-clad fiber lasers," Opt. Laser Eng. 47, 148 -155 (2009).

D. Faucher, M. Bernier, N. Caron, R. Vallée, "Erbium-doped all-fiber laser at 2.94 μm," Opt. Lett. 34, 3313-3315 (2009).

2007 (3)

X. P. Cheng, J. Zhang, P. Shum, M. Tang, R. F. Wu, "Influence of sidelobes on fiber-Bragg-grating-based Q-switched fiber laser ," IEEE Photon. Technol. Lett. 19, 1646-1648 (2007).

M. Bernier, D. Faucher, R. Vallée, A. Saliminia, G. Androz, Y. Sheng, S. L. Chin, "Bragg gratings photoinduced in ZBLAN fibers by femtosecond pulses at 800 nm ," Opt. Lett. 32, 454-456 (2007).

G. Androz, D. Faucher, M. Bernier, R. Vallée, "Monolithic fluoride- fiber laser at 1480 nm using fiber bragg gratings," Opt. Lett. 32, 1302-1304 (2007).

1997 (2)

Y. Zhao, S. Fleming, "Theory of Pr $^{3+}$ -doped fluoride fiber upconversion lasers," IEEE J. Quantum Electron 33, 905-915 (1997).

J. L. Archambault, S. G. Grubb, "Fiber gratings in lasers and amplifiers," J. Lightw. Technol. 15, 1378-1390 (1997).

1991 (1)

J. Y. Allain, M. Monerie, H. Poignant, "Red upconversion Yb-sensitised Pr fluoride fibre laser pumped in 0.8 μm region," Electron. Lett 27, 1156-1157 (1991).

1985 (1)

M. Eyal, E. Greenberg, R. Reisfeld, N. Spector, "Spectroscopy of praseodymium (III) in zirconium fluoride glass ," Chem. Phys. Lett. 117, 108-114 (1985).

Chem. Phys. Lett. (1)

M. Eyal, E. Greenberg, R. Reisfeld, N. Spector, "Spectroscopy of praseodymium (III) in zirconium fluoride glass ," Chem. Phys. Lett. 117, 108-114 (1985).

Electron. Lett (1)

J. Y. Allain, M. Monerie, H. Poignant, "Red upconversion Yb-sensitised Pr fluoride fibre laser pumped in 0.8 μm region," Electron. Lett 27, 1156-1157 (1991).

Electron. Lett. (1)

J. Nakanishi, T. Yamada, Y. Fujimoto, O. Ishii, M. Yamazaki, "High-power red laser oscillation of 311.4 mW in Pr $^{3+}$ -doped waterproof fluoro-aluminate glass fibre excited by GaN laser diode," Electron. Lett. 46, 1285-1286 (2010).

IEEE J. Quantum Electron (1)

Y. Zhao, S. Fleming, "Theory of Pr $^{3+}$ -doped fluoride fiber upconversion lasers," IEEE J. Quantum Electron 33, 905-915 (1997).

IEEE J. Quantum Electron. (1)

Y. Wang, C.-Q. Xu, " Switching-induced perturbation and influence on actively Q-switched fiber lasers," IEEE J. Quantum Electron. 40, 1583-1596 (2004 ).

IEEE Photon. Technol. Lett. (1)

X. P. Cheng, J. Zhang, P. Shum, M. Tang, R. F. Wu, "Influence of sidelobes on fiber-Bragg-grating-based Q-switched fiber laser ," IEEE Photon. Technol. Lett. 19, 1646-1648 (2007).

J. Lightw. Technol. (1)

J. L. Archambault, S. G. Grubb, "Fiber gratings in lasers and amplifiers," J. Lightw. Technol. 15, 1378-1390 (1997).

Opt. Laser Eng. (1)

X. P. Cheng, P. Shum, M. Tang, R. Wu, "Numerical analysis and characterization of fiber bragg grating-based Q-switched ytterbium-doped double-clad fiber lasers," Opt. Laser Eng. 47, 148 -155 (2009).

Opt. Lett. (5)

Other (5)

J. Nakanishi, T. Yamada, Y. Fujitomo, O. Ishii, M. Yamazaki, "Sub- watt output power at 638 nm in wavelength by direct oscillation with Pr- doped waterproof fluoro-aluminate glass fiber laser," Eur. Conf. Lasers Electro-Opt./Int. Quantum Electron. Conf. presented at theMunichGermany ( 2011).

U. Weichmann, J. Baier, J. Bengoechea, H. Moench, "GaN-diode pumped Pr $^{3+}$ : ZBLAN fiber-lasers for the visible wavelength range," Eur. Conf. Lasers Electro-Opt./Int. Quantum Electron. Conf. presented at theMunich Germany (2007).

H. Okamoto, K. Kasuga, I. Hara, Y. Kubota, "Ultra-wideband tunable RGB fiber laser," Conf. Lasers Electro-Opt./Int. Quantum Electron. Conf. presented at the BaltimoreMDUSA (2009).

M. J. F. Digonnet, Rare-Earth-Doped Fiber Lasers and Amplifiers (Marcel Dekker, 2001) pp. 387.

Y. Fujimoto, M. Yamazaki, "Stimulated emission cross sections of Pr doped fluoride glass evaluated by judd-ofelt analysis ," Eur. Conf. Lasers Electro-Opt./Int. Quantum Electron. Conf. presented at theMunichGermany ( 2009).

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