Q-switched Double-clad Fiber Laser Research Articles

Bismuth (III) Telluride (Bi2Te3) topological insulator embed in PVA as passive Q-switcher at 2 micron region

We demonstrate a passive Q-switched at 2 um region by integrating Bismuth (III) Telluride (Bi2/Te3) embedded in Polyvinyl Alcohol (PVA). Bi2Te3 was embedded in PVA by solution casting approach to develop a Bi2/Te3-PVA film and integrated in the laser cavity with ring configuration to generate pulse laser. The experimental works show that the proposed passive saturable absorber operates at input pump power ranges from 637 mW to 784 mW with central wavelength of 1957.6 nm. We observed the tunable repetition rate from 12.6 kHz to 26.1 kHz with the shortest pulse width of 2.22 us. The laser produces maximum instantaneous output peak power and pulse energy of 0.42 W and 0.94 uJ, respectively. Full Text: PDF ReferencesC. Zhao, H. Zhang, X. Qi, Y. Chen, Z. Wang, S. Wen, and D. Tang, "Ultra-short pulse generation by a topological insulator based saturable absorber", Appl. Phys. Lett. 101, 211106 (2012). CrossRef Z. C. Luo, M. Liu, H. Liu, X.-W. Zheng, A.-P. Luo, C.-J. Zhao, H. Zhang, S. C. Wen, and W.-C. Xu, "2GHz passively harmonic mode-locked fiber laser by a microfiber-based topological insulator saturable absorber", Opt. Lett. 38, 5212 (2013). CrossRef J. Lee, J. Koo, Y. M. Jhon, and J. H. Lee, "A femtosecond pulse erbium fiber laser incorporating a saturable absorber based on bulk-structured Bi2Te3 topological insulator", Opt. Express 22, 6165 (2014). CrossRef M. Jung, J. Lee, J. Koo, J. Park, Y. W. Song, K. Lee, S. Lee, and J. H. Lee, "A femtosecond pulse fiber laser at 1935 nm using a bulk-structured Bi2Te3 topological insulator", Opt. Express 22, 7865(2014). CrossRef Y. H. Lin, C. Y. Yang, S.-F. Lin, W. H. Tseng, Q. Bao, C. I. Wu, and G.R. Lin, "Soliton compression of the erbium-doped fiber laser weakly started mode-locking by nanoscale p-type Bi2Te3 topological insulator particles", Laser Phys. Lett. 11, 055107(2014). CrossRef J. Lee et al., "All-fiberized, passively Q-switched 1.06 ?m laser using a bulk-structured Bi2Te3 topological insulator", Journal of Optics 16, 085203(2014). CrossRef Y. Chen, et al., "Large Energy, Wavelength Widely Tunable, Topological Insulator Q-Switched Erbium-Doped Fiber Laser", IEEE Journal of Selected Topics in Quantum Electronics 20, 315(2014). CrossRef M. Wu et al., "Nanosecond Q -Switched Erbium-Doped Fiber Laser With Wide Pulse-Repetition-Rate Range Based on Topological Insulator", IEEE Journal of Quantum Electronics 50, 393(2014). CrossRef J. Lee et al., "Dry Etched Waveguide Laser Diode on GeOI", IEEE Journal of Selected Topics in Quantum Electronics 21, 31(2015). CrossRef J. Li et al., "3-?m mid-infrared pulse generation using topological insulator as the saturable absorber ", Optics Letters 40, 3659(2015). CrossRef Z. Luo et al., "Topological-Insulator Passively Q-Switched Double-Clad Fiber Laser at 2 ?m Wavelength", IEEE J. Sel. Topics Quantum Electron 20, 0902708 (2014). CrossRef M. C. Paul, A. Dhar, S. Das, A. A. Latiff,M. T. Ahmad,and S. W. Harun, "Enhanced Erbium?Zirconia?Yttria?Aluminum Co-Doped Fiber Amplifier" IEEE Photonics Journal 7, 7100408 (2015). CrossRef H. Liu et al., "Femtosecond pulse generation from a topological insulator mode-locked fiber laser", Optics Express 22, 6868 (2014). CrossRef Z. Sun, T. Hasan, and A. C. Ferrari, "Ultrafast lasers mode-locked by nanotubes and graphene", Physica E 44, 1082(2012). CrossRef J. Lee, M. Jung, J. Koo, C. Chi, and J. Lee, "Dry Etched Waveguide Laser Diode on GeOI", IEEE Journal of Selected Topics in Quantum Electronics 21, 0900206 (2015). CrossRef H. Ahmad, A. Z. Zulkifli, K. Thambiratnam, and S. W. Harun, "2.0-?m Q-Switched Thulium-Doped Fiber Laser With Graphene Oxide Saturable Absorber", IEEE Photonics Journal5, 1501108(2013). CrossRef

2-μm wavelength all-fiber Q-switched double-clad fiber laser using monopiece single-layer chemical-vapor-deposition graphene

We demonstrate a large-energy 2-μm double-clad Tm-doped fiber laser (DC-TDFL) Q-switched by a monopiece single-layer graphene nanosheet. The single-layer graphene is fabricated by the chemical vapor deposition (CVD) method, and then transferred onto the facet of a fiber ferrule for constructing a fiber-compatible saturable absorber (SA). The Q-switching operation of the DC-TDFL at 1980 nm is achieved and has a large pulse energy of 1.06 μJ (corresponding to the average output power of 28.6 mW). The narrowest pulse duration is 2.7 μs, and the pulse repetition rate can be tuned from 8 to 27 kHz by changing the pump power from 2.35 to 2.82 W. To the best of our knowledge, this work is not only the first demonstration of a 2-μm Q-switched all-fiber laser using monopiece single-layer CVD graphene as a SA, but also generates the largest pulse energy from graphene-based all-fiber DC-TDFLs. © 2014 Society of Photo-Optical Instrumentation Engineers (SPIE) (DOI: 10.1117/1.OE.53.10 .106103)

Analysis of thermal effects in end-diode-pumped, Q-switched Nd:YVO4 laser

We present a laboratory model of a Q-switched Nd:YVO 4 laser with thermal effects compensation dedicated as a laser head for marking devices. Theoretical analysis on thermal effects were performed and resonator parameters were optimized. For 10 kHz repetition rate we obtained about 0.25 mJ of pulse energy corresponding to about 45 kW of peak power with slope efficiency 14%. M 2 parameter was 1.6. Full Text: PDF References J. E. Geusic, H. M. Marcos, L. G. Van Uitert, "Laser oscillations in nd-doped yttrium aluminum, yttrium gallium and gadolinium garnets", Applied Physics Letters 4 (10), (1964) CrossRef L. Gorajek, L. Galecki, "Tunable, gain switched Ti3+:Al2O3 laser pumped by intracavity frequency doubled Nd3+:YLF laser", Photonics Letters of Poland 1, No 3, 136-138 (2009) CrossRef W. Zendzian, J. K. Jabczynski, P. Wachulak, J. Kwiatkowski, "High-repetition-rate, intracavity-pumped KTP OPO at 1572 nm", Appl. Phys. B 80, 329-332 (2005) CrossRef J. Swiderski, A. Zajac, P. Konieczny, M. Skorczakowski, "Numerical model of a Q-switched double-clad fiber laser", Opt. Express 12, 3554-3559 (2004) CrossRef J. Swiderski, A. Zajac, P. Konieczny, M. Skorczakowski, "Q-switched Nd-doped double-clad fiber laser", Opto-Electronics Review, vol. 13, no. 3, 29-33, 2005 DirectLink

Numerical analysis and characterization of fiber Bragg grating-based Q-switched ytterbium-doped double-clad fiber lasers

A numerical model of the fiber Bragg grating (FBG)-based actively Q-switched double-clad fiber laser is presented in this paper. Based on numerical simulations, the influence of FBG on Q-switched pulse performance of Yb 3+-doped double-clad fiber laser is studied, the pulse characteristics are discussed and analyzed using different FBG profiles, and further investigation is conducted to study the pulse characteristics of the fiber lasers under varying Q-switching conditions, including repetition rates, apodization profiles of FBG, peak reflectivity of the tunable FBG, cavity length and pump power.

High-Repetition-Rate MHz Acoustooptic $Q$-Switched Fiber Laser

A simple actively Q-switched double-clad fiber laser combining an amplifying cavity is reported by using a dynamic acoustooptic Q-switching as a beam splitter. Sub-100-ns pulses independence of the repetition rate of acoustooptic modulator are almost changeless with repetition rate varied from 50 kHz to 1.5 MHz. With 4.5-W absorbed power, 9.4-W peak-power pulses at 1.5-MHz repetition rate with 75-ns pulse duration are generated.

Study of characteristics of acoustic-optic Q-switched double-clad fiber laser with different cavity configurations

The characteristics of acoustic-optic double-clad fiber laser end-pumped by diode laser are reported for different pumping constructions. The comparison and discussions of average power, pulse width and stability of Q-switched pulses under the forward pump and back ward pump conditions are presented. In experiment, the output of Q-switched pulses with 60% slope efficiency of average power, 52ns pulse width and 03mJ single pulse were obtained at the repetition rate of 10kHz. Finally, the rate equations with different pump configurations are deduced to analyze the Q-switched pulse, and the theoretical results agree with well experimental results.

Influence of stimulated Brillouin scattering on the temporal dynamics of an actively Q-switched double-clad fiber laser

The role of stimulated Brillouin scattering (SBS) during the active Q-switching of a typical high power double-clad fiber laser is experimentally and theoretically investigated. Our numerical model reproduces multiples Brillouin Stokes generation and the fast temporal dynamics which were experimentally observed. It clearly demonstrates that SBS is the cause of peak power enhancement effects such as giant pulse generation. The pulse formation process during the active Q-switching and the precise role of SBS in the pulse narrowing is detailed.

Modeling and optimization of Q-switched double-clad fiber lasers

The numerical modeling of actively Q-switched fiber lasers is systematically presented. On the basis of typical Q-switched ytterbium-doped double-clad fiber lasers under forward and backward pump, the dynamic characteristics of pulse energy, pulse width, population inversion, and stored energy at tens-of-kilohertz repetition rates are studied by using the traveling-wave method. The laser performance is further investigated for different fiber core diameters, doping rates, cavity lengths, fiber losses, signal and pump wavelengths, reflectivities of output coupler, and switching speed of an acousto-optic modulator; the laser optimization is also quantitatively discussed. Some simulation results are also compared with previous experimental results.

Tunable high-peak-power, high-energy hybrid Q-switched double-clad fiber laser.

A cw laser-diode-pumped Yb-doped double-clad fiber laser operating in a hybrid Q-switched regime was demonstrated. The output pulses had a duration as short as 4.2 ns, a tunable wavelength range from 1080.8 to 1142.7 nm, and a linewidth of less than 0.05 nm. Maximum peak power of approximately 175 kW and single-pulse energy of 1.57 mJ were obtained.

Numerical model of a Q-switched double-clad fiber laser

The time-energy characteristics of a Q-switched neodymiumdoped double-clad fiber laser are presented. Based on the proposed differential equations, a numerical model is developed to simulate this fiber laser. Using this model pulse duration and the energy of generated pulses can be predicted.

Narrow-linewidth widely tunable hybrid Q-switched double-clad fiber laser.

A laser-diode-pumped Yb-doped double-clad fiber laser operating in a hybrid Q-switched regime has been demonstrated. With pulsed pump light and stimulated Brillouin scattering of the gain fiber as the Q-switching mechanisms, the laser generated nanosecond pulses with a stable repetition rate. A single-pulse energy of as much as 143.1 microJ with a peak power of 28.6 kW was obtained. Use of an external-cavity diffraction grating in the Littman configuration permitted tuning of the laser wavelength over a 15.7-THz range from 1080 to 1140 nm, and a linewidth of 0.04 nm over the whole tuning range was achieved.