Author Affiliations
Abstract
1 Defence R&D Canada, Valcartier Centre, Québec G3J 1X5, Canada
2 Le Verre Fluoré, Campus KerLann, F-35170 Bruz, Brittany, France
3 Center for Optics, Photonics and Lasers (COPL), Université Laval, Québec G1V 0A6, Canada
We report on infrared supercontinuum (SC) generation in step-index fluoroindate-based fiber by using an all-fiber laser source. In comparison to widely used ZBLAN fibers for high-power mid-infrared (MIR) SC generation, fluoroindate fibers have multiphoton absorption edges at significantly longer wavelengths and can sustain similar intensities. Recent developments highlighted in the present study allowed the production of fluoroindate fibers with MIR background loss of 2 dB/km, which is similar to or even better than ZBLAN fibers. By using an all-fiber picosecond laser source based on an erbium amplifier followed by a thulium power amplifier, we demonstrate the generation of 1.0 W infrared SC spanning over 2.25 octaves from 1 μm to 5 μm. The generated MIR SC also exhibits high spectral flatness with a 6 dB spectral bandwidth from 1.91 μm to 4.77 μm and an average power two orders of magnitude greater than in previous demonstrations with a similar spectral distribution.
Fiber optics, infrared Nonlinear optics, fibers Supercontinuum generation Photonics Research
2018, 6(6): 06000609
Author Affiliations
Abstract
1 College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China
2 Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
In this work, we investigate a new type of fluoride glasses modified by Al(PO3)3 with various Tm3+/Ho3+ doping concentrations. The introduced PO3 plays an effective role in improving the glass-forming ability and thermal stability. Besides, 1.47, 1.8, and 2.0 μm emissions originating from Tm3+ and Ho3+, respectively, are observed. The spectroscopic properties and energy transfer mechanisms between Tm3+ and Ho3+ are analyzed as well. It is noted that the higher predicted spontaneous transition probability (118.74 s 1) along with the larger product of measured decay lifetime and the emission cross section (σemi×τ) give evidence of intense 2.0 μm fluorescence.
160.4670 Optical materials 160.5690 Rare-earth-doped materials 060.2390 Fiber optics, infrared 070.4790 Spectrum analysis Chinese Optics Letters
2017, 15(5): 051604
Author Affiliations
Abstract
Key Laboratory for Laser Plasmas (Ministry of Education), Collaborative Innovation Center of IFSA (CICIFSA), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
We report a continuous-wave Er:ZBLAN fiber laser with the operation wavelength reaching 3.68 μm. The mid-infrared Er:ZBLAN fiber laser is pumped with the dual-wavelength sources consisting of a commercial laser diode at 970 nm and a homemade Tm-doped fiber laser at 1973 nm. By increasing the launched pump power at 1973 nm, the laser wavelength can be switched from 3.52 to 3.68 μm. The maximum output power of 0.85 W is obtained with a slope efficiency of 25.14% with respect to the 1973 nm pump power. In the experiment, the laser emission at 3.68 μm is obtained with a significant power of 0.62 W, which is the longest emission wavelength in free-running Er:ZBLAN fiber lasers.
140.3070 Infrared and far-infrared lasers 060.2390 Fiber optics, infrared 060.3510 Lasers, fiber Chinese Optics Letters
2017, 15(11): 111402
Author Affiliations
Abstract
Department of Physical Chemistry and Chemistry of Colloids, Ural Federal University Named After the First President of Russia B.N. Yeltsin, 19 Mira Street, Yekaterinburg 620002, Russia
For the development of mid-infrared fiber-optical elements, one needs light-stable, flexible materials that are transparent within this spectral band. Solid solutions of silver and monadic thallium halides prove to be the most suitable crystalline media for these needs. We study the light stability variation of high-purity AgCl1 xBrx (0≤x≤1) and Ag1 xTlxBr1 xIx (0≤x≤0.05) crystals by measuring the optical transmission change as functions of the composition and UV exposure time. The former is executed in a broad spectral range from 6500 350 cm 1, within which we choose three wavelengths to trace the transmission change. For thallium-monoiodide-containing samples, an effect is observed that we assumed to be translucence.
060.2290 Fiber materials 060.2390 Fiber optics, infrared 160.4670 Optical materials 160.4760 Optical properties Chinese Optics Letters
2016, 14(2): 020603
Author Affiliations
Abstract
National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150080, China
We demonstrate a diode-pump Tm3+-doped all-fiber laser operating at 1908 nm based on a master oscillator power amplifier (MOPA) configuration. In our work, 152 W of laser output power is generated by a total incident pump power of 434 W at 790 nm, corresponding to the total optical efficiency of 35%. The laser wavelength is 1908.29 nm. To the best of our knowledge, it is the highest output power reached around 1908 nm with such a narrow linewidth of 0.18 nm based on a MOPA configuration.
140.3510 Lasers, fiber 060.2320 Fiber optics amplifiers and oscillators 060.2390 Fiber optics, infrared Chinese Optics Letters
2016, 14(6): 061403
Author Affiliations
Abstract
Ural Federal University named after the first President of Russia, B.N. Yeltsin. 19 Mira Street, Ekaterinburg 620002, Russia
For the development of fiber optics for the range from 0.2 to 50.0 μm, one needs light-stable, nonhygroscopic, ductile crystals that would be transparent within this spectral range and have a lack of cleavage, and from which the flexible infrared (IR) fibers are extruded. The crystals based on solid solutions of silver and monadic thallium halides meet the conditions listed above. Consequently, by differential thermal and x ray analyses, we study the TlBr–TlI phase diagram using the crystals with optimal compositions, which we grow ourselves. We also manufacture light-stable nanocrystalline IR fibers that are transparent at longer wavelengths compared with AgCl–AgBr fibers.
060.2390 Fiber optics, infrared 160.4670 Optical materials 260.1180 Crystal optics Chinese Optics Letters
2015, 13(9): 090602
Author Affiliations
Abstract
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
We study the influence of alkali oxides on the near-infrared (NIR)-emitting thermal stability of Bi-doped R2O–SiO2–B2O3–Al2O3 (R = Li, Na, K) glasses below Tg. Results show that undergoing heat treatment, re-markable luminescence quenching occurs for the glasses containing Na2O and K2O due to the formation of Bi metallic colloids, whereas the glass with Li2O shows much better thermal stability. These changes can be understood by the tendency of modifier cations with lower mobility and higher tightness network to restrain the transport of Bi-related NIR-emitting centers. The results provide a scientific reference for composition design of Bi-doped optical fiber.
160.2540 Fluorescent and luminescent materials 160.4760 Optical properties 060.2390 Fiber optics, infrared 160.2750 Glass and other amorphous materials Chinese Optics Letters
2014, 12(11): 111601
Author Affiliations
Abstract
1 Department of Control Engineering, Naval Aeronautical and Astronautical University, Yantai 264001, China
2 Navy Unit 91404, Qinhuangdao 066001, China
3 National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150080, China
Broadband mid-infrared (IR) supercontinuum laser is generated in standard single-mode fiber-28 directly pumped by a 2054 nm nanosecond Q-switched Tm,Ho:YVO4 laser. The average output powers of 0.53 W in the ~1.95–2.5 μm spectral band and 0.65 W in the ~1.97–2.45 μm spectral band are achieved at pulse rate frequencies of 7 and 10 kHz, and the corresponding optic-to-optic conversion efficiencies are 34.6% and 42.4% by considering the coupling efficiency. The output spectra have extremely high flatness in the range 2060–2400 and 2060–2360 nm with negligible intensity variation (<2%), respectively. The output pulse shape is not split, and pulse width is reduced from 29 to ~15.4 ns. The beam quality factor M2 is 1.06, measured using traveling knife-edge method, and the laser beam spot is also monitored by an IR vidicon camera.
060.2390 Fiber optics, infrared 060.2430 Fibers, single-mode 060.4370 Nonlinear optics, fibers Chinese Optics Letters
2014, 12(9): 090605
Author Affiliations
Abstract
We report a nanosecond-pulse amplification system based on an Yb-doped, 100-\mu m core, rod-type photonic crystal fiber. Up to 10W of average power with pulse energy of 1 mJ and peak power of 450 kWis obtained at the repetition rate of 10 kHz. The high-power nanosecond pulse has a good pulse shape and spectral characteristics. The usage of rod-type fibers provides a novel structure for nanosecond pulse amplification.
060.2320 Fiber optics amplifiers and oscillators 060.2390 Fiber optics, infrared 060.3510 Lasers, fiber 060.5295 Photonic crystal fibers Chinese Optics Letters
2013, 11(5): 050601
Author Affiliations
Abstract
We demonstrate a passively Q-switched Tm-doped fiber laser with carbon nantubes (CNTs), yielding a maximum output average power of around 82 mW and the corresponding pulse energy of 1.2 \mu J. The laser operates at ~1.985 \mu m with repetition rates ranging from 26 to 69 kHz and pulse-duration from 1.5 to 2.6 \mu s. Our proposed laser shows that the CNTs are promising for the potential Q-switched Tm-doped fiber laser with high energy and tunable wavelength operation. To the best of our knowledge, this is the first report of a Q-switched Tm-doped fiber laser with CNTs as saturable absorber.
140.3510 Lasers, fiber 140.3540 Lasers, Q-switched 060.2320 Fiber optics amplifiers and oscillators 060.2390 Fiber optics, infrared Chinese Optics Letters
2012, 10(s2): S21411
