High-power pulsed diode-pumped Er:ZBLAN fiber laser

Gorjan, Martin; Petkovšek, Rok; Marinček, Marko; Čopič, Martin

doi:10.1364/ol.36.001923

Cited by 64 publications

(34 citation statements)

References 15 publications

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“…Fluoride glass pulsed fiber lasers have been reported based on Er 3 -doped and Er 3 , Pr 3 codoped fluoride fibers [1][2][3][4][5]. Recently, we have extended this work by creating actively Q-switched cascaded 380 and 260 ns pulses at 3.005 and 2.074 μm, respectively, using singly Ho 3 -doped ZBLAN fiber [6] and 78 ns actively Q-switched pulse widths at 2.86 μm using Ho 3 , Pr 3 codoped ZBLAN fiber at a comparatively high slope efficiency of 20% [7].…”

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Efficient 287 μm fiber laser passively switched using a semiconductor saturable absorber mirror

et al. 2012

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A passively switched Ho 3 , Pr 3 codoped fluoride fiber laser using a semiconductor saturable absorber mirror (SESAM) is demonstrated. Q-switching and partial mode-locking were observed with the output power produced at a slope efficiency of 24% with respect to the absorbed pump power. The partially mode-locked 2.87 μm pulses operated at a repetition rate of 27.1 MHz with an average power of 132 mW, pulse energy of 4.9 nJ, and pulse width of 24 ps. Compared to Q-switched fiber lasers, mode-locked fiber lasers are particularly useful because they typically offer a higher peak power and a significantly shorter pulse width that can be used to pump optical parametric oscillators or to create a supercontinuum in the midinfrared region. In the past few years, several passively mode-locked fiber lasers emitting at 2 μm have been reported, with the best performance being achieved with thulium-doped silicate fiber that produced 1.5 ps duration pulses and 0.76 nJ pulse energies using semiconductor saturable absorber mirrors (SESAMs) [8], and with dispersion compensation, 173 fs stretched-pulses with 4 nJ pulse energy was obtained at 1.97 μm [9].Compared to Er 3 -doped ZBLAN fiber lasers, Ho 3 -doped ZBLAN fiber lasers have a longer emission peak wavelength and a higher Stokes efficiency limit as a result of the longer pump wavelength of 1150 nm. In a similar way to the transition in Er 3 -doped ZBLAN, the 5 I 6 → 5 I 7 laser transition of Ho 3 encounters a potential population bottlenecking problem because the 3.5 ms lifetime of the upper ( 5 I 6 ) laser level is shorter than the 12 ms lifetime of the lower ( 5 I 7 ) laser level and, in a parallel way to Er 3 , Ho 3 requires some engineering of the doping or laser process in order to create efficient emission. For example, quenching of the 5 I 7 lifetime by Pr 3 codoping has resulted in efficient cw [10] and actively Q-switched pulsed operation [7].In this Letter, we report the demonstration of a passively Q-switched and partially mode-locked Ho 3 , Pr 3 codoped fluoride laser that produced pulses at 2.87 μm using newly developed SESAM. Q-switching, Q-switched mode-locking, and unstable cw mode-locking regimes was observed with increasing pump power.The experimental arrangement for the passively switched Ho 3 , Pr 3 codoped ZBLAN fiber laser is shown in Fig. 1. The double-clad fluoride fiber (FiberLabs, Japan) was identical to the fiber used in our previous free-running experiment [10] and had a D-shaped pump core with a diameter of 125 μm across the circular cross section and a numerical aperture (NA) of 0.50. The fiber had a 10 μm-core diameter with an NA of 0.2. The Ho 3 and Pr 3 ion concentrations of the fiber were 30,000 and 2,500 ppm molar, respectively. The selected fiber length of 3.5 m provided 88% pump absorption efficiency.Commercially available high power 1.15 μm diode lasers (Eagleyard Photonics, Berlin) were used to pump the fiber after polarization multiplexing and focusing using an antireflection-coated ZnSe objective lens (Innovation Photonics, LFO-5-6-3....

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Efficient 287 μm fiber laser passively switched using a semiconductor saturable absorber mirror

et al. 2012

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“…For the purpose of obtaining excellent mid-infrared spectroscopic properties, a suitable glass host is required. To date, fluoride glass, in particular ZBLAN, has been widely investigated as a mid-infrared laser material due to its quite low maximum phonon energy and high solubility of rare earth ions (4)(5)(6)(7)(8). Moreover, a maximum output power of 20.6 W at 2.825 μm has been reported in Er…”

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Tunable mid‐infrared luminescence from Er³⁺‐doped germanate glass

Wei

Jing

et al. 2014

Luminescence

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Er(3+) -doped germanate glasses with superior thermal stability were prepared. Judd-Ofelt intensity parameters and important spectroscopic properties were discussed in detail. Upon 800 nm and 980 nm LD pumping, 2.7 µm fluorescence characteristics were investigated and it was found that the effective 2.7 µm emission bandwidth can reach to 101.79 nm in prepared glasses. The tunability of the 2.7 µm emission band can be realized by adjusting the Er(3+) content. Moreover, a high-emission cross-section (11.09 × 10(-21) cm(2) ), large gain bandwidth (772.30 × 10(-28) cm(3) ) and gain coefficient (6.72 cm(-1) ) were obtained in the prepared sample. Hence, Er(3+) -doped germanate glass might be a promising mid-infrared material for tunable amplifiers or lasers.

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“…The operating wavelength was 2.800 μm, and the efficiency with respect to the launched pump power was lower at 17%. Higher efficiencies were achieved by gain switching an Er 3doped ZBLAN laser, which produced 68 W peak power, 300 ns pulses at 100 kHz, with an efficiency with respect to launched pump power of 34% [6].…”

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“…Although longer wavelength emission has been reported in cw mode using fiber Bragg gratings [14], the naturally longer emission wavelength of Ho 3 fluorescence allows simple wavelength extension for Q-switched fluoride fiber lasers [15]. Gain switched Er 3 -doped ZBLAN fiber lasers have produced high efficiencies [6]; the current laser is advantageous in providing a broader range of pulse repetition rates.…”

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confidence: 99%