38.2 dB amplification at 1.31 μm and possibility of 0.98 μm pumping in Pr3+-doped fluoride fibre

Miyajima, Y.; Sugawa, T.; Fukasaku, Y.

doi:10.1049/el:19911062

Cited by 97 publications

(24 citation statements)

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“…17 The optical amplification with 77 nm bandwidth implies the GGAB glass can overcome the disadvantages of the present praseodymium-doped fluoride fiber amplifiers such as brittle and narrow amplification bandwidth ͑25 nm͒. 28,29 Furthermore, it is significant to point out that the amplification phenomenon at 1560 nm is also observed. It means that the superwide amplification covering whole O, E, S, C, and L bands could be potentially realized in the GGAB glass system.…”

Section: Resultsmentioning

confidence: 99%

Infrared luminescence and amplification properties of Bi-doped GeO2−Ga2O3−Al2O3 glasses

Zhou

Dong

Zeng

et al. 2008

Journal of Applied Physics

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Bi, Ga, and Al codoped germanium glass was prepared and its optical properties were investigated by absorption, photoluminescence excitation ͑PLE͒, and photoluminescence spectra. Two active centers which occupy strong and weak crystal field environment are identified by using the PLE spectrum. The tunable and ultrabroadband luminescence properties are originated from electron transitions of these two active centers. Internal optical gain around 1300 and 1560 nm has been detected. The wavelength-dependent internal gains excited with 808 and 980 nm laser diodes show different characteristics, and the relative flat optical amplification can be realized by choosing 980 nm pumping.

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Section: Resultsmentioning

confidence: 99%

Infrared luminescence and amplification properties of Bi-doped GeO2−Ga2O3−Al2O3 glasses

Zhou

Dong

Zeng

et al. 2008

Journal of Applied Physics

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“…Particularly, the 4 I 13/2 → 4 I 15/2 luminescence of Er 3ϩ at 1.5 m has been extensively studied for the purpose of developing a light amplifier for telecommunication devices made of fiber glasses. [8][9][10] Also, the 4 I 11/2 → 4 I 13/2 emission of erbium at 2.7 m in fluoride glasses constitutes a very promising system to construct all solid state lasers emitting near 3 m to be applied as surgical instruments. [11][12][13][14] However, the energy level scheme of Er 3ϩ does not favor the optical amplification at 1.5 m because the three levels system involved.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of the Yb–Er energy transfer in fluorozirconate glass

Vila¹,

Gomes²,

Tarelho³

et al. 2003

Journal of Applied Physics

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The mechanism of the Yb 3ϩ →Er 3ϩ energy transfer as a function of the donor and the acceptor concentration was investigated in Yb 3ϩ -Er 3ϩ codoped fluorozirconate glass. The luminescence decay curves were measured and analyzed by monitoring the Er 3ϩ ( 4 I 11/2 ) fluorescence induced by the Yb 3ϩ ( 2 F 5/2 ) excitation. The energy transfer microparameters were determined and used to estimate the Yb-Er transfer rate of an energy transfer process assisted by excitation migration among donors state ͑diffusion model͒. The experimental transfer rates were determined from the best fitting of the acceptor luminescence decay obtained using a theoretical approach analog to that one used in the Inokuti-Hirayama model for the donor luminescence decay. The obtained values of transfer parameter gamma ͓␥͑exp͔͒ were always higher than that predicted by the Inokuti-Hirayama model. Also, the experimental transfer rate, ␥ 2 (exp), was observed to be higher than the transfer rate predicted by the migration model. Assuming a random distribution among excited donors at the initial time (tϭ0) and that a fast excitation migration, which occurs in a very short time (t Ӷ␥ Ϫ2 ), reducing the mean distance between donor ͑excited͒ and acceptor, all the observed results could be explained.

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“…However, multiphonon relaxation reduces the radiative lifetime of 3.2 ms in ZBLAN glass of the Pr 3÷ 1G 4 state to the observed emission lifetime of 110 Ixs. The low value of the emission lifetime is the key reason why Pr-doped ZBLAN fiber amplifiers require high pump powers [1,2]. This factor is an incentive to look at sulfide host glass compositions with even lower phonon energies (about 350 cm -1) and lower multiphonon relaxation rates, to produce more pump power efficient amplifiers.…”

Section: Introductionmentioning

confidence: 99%