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Optics Letters

Broadband superfluorescent emission of the ^3H_4 → ^3H_6 transition in a Tm-doped multicomponent silicate fiber

Kyunghwan Oh, Arnd Kilian, P. M. Weber, Lawrence J. Reinhart, Qin Zhang, Theodore F. Morse

Published Aug 1, 1994• 23 citations
Publisher

Abstract

We report the observation of amplified spontaneous emission in the (3)H(4) ? (3)H(6) transition of Tm(+3) in a Ta(2)O(5)-doped multicomponent silicate fiber. The evolutions of the spectral shape, output power, and center wavelength were measured as a function of fiber length and pump power in the previously unstudied high-power range, where saturation effects dominate. An output power of 1 mW has been achieved at 1.91 microm with a bandwidth of 77 nm.

DOI
10.1364/ol.19.001131

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We report the observation of amplified spontaneous emission in the (3)H(4) ? (3)H(6) transition of Tm(+3) in a Ta(2)O(5)-doped multicomponent silicate fiber. The evolutions of the spectral shape, output power, and center wavelength were measured as a function of fiber length and pump power in the previously unstudied high-power range, where saturation effects dominate. An output power of 1 mW has been achieved at 1.91 microm with a bandwidth of 77 nm.
The inhomogeneous behavior of the 1.06 /spl mu/m-neodymium transitions in doped optical fibers have been investigated, using the fluorescence line narrowing technique, pumping on the /sup 4/F/sub 3/2/ and /sup 4/F/sub 5/2/ sublevels at 4 K. Each observed transition has been identified. As the pump wavelength varies, the shift of the main fluorescence line is 40 nm, with the two pumping levels. We have studied the spectral behavior of the superfluorescence as a function of the pump wavelength, the temperature, and the absorbed power. The spectral evolution depends on /spl lambda//sub p/ with 19 nm-tuning range at low temperature. At 300 K, the quasihomogeneous behavior of the transition decreases the tunability to 14 nm. Based on these results, we present a simple technique permitting precise prediction of gain and spectral line shapes of superfluorescent Nd-doped fiber sources.>
In this paper, we present the energy level, transition configuration, and numerical model of a bismuth-doped fiber amplifier for the first time, to the best of authorspsila knowledge. With a three-level system, the rate and power propagation equations of the model are solved to examine the effect of the fiber parameter and pump power on the bandwidth of the gain spectra. It can be predicted that when excited at wavelength in the 800-900 nm range, the amplifier can have a ultrabroad gain spectra in the 1.2-1.62 mum range, which cover the low-loss windows of the all-wave fiber.
A detailed investigation is made of the spectral properties of several superfluorescence operations in Nd-doped and Er-doped silica fibres pumped by a 514.5 nm Ar ion laser. The study demonstrates the spectral narrowing processes in the operations of superfluorescence. In Nd-doped fibre, the higher gain at 1080 nm suppresses the emission at about 910 nm, but the authors have still realized, for the first time, superfluorescence in this wavelength band, and a 0.4 mW output was achieved in a double-pass configuration. Also, the process of change from superfluorescence to lasing was recorded and analysed.