Efficient Bismuth-Doped Fiber Lasers

Dvoyrin, Vladislav; Mashinsky, Valery M.; Dianov, Evgenii M

doi:10.1109/jqe.2008.924239

Cited by 74 publications

(36 citation statements)

References 10 publications

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“…The emission lifetime at room temperature typically ranges from hundreds of microseconds to several milliseconds. An additional absorption band at 1400 nm was observed by Dvoyrin et al and Bufetov et al in bismuth doped silica glass [1,[3][4][5]. In a non-oxide glass, Hughes et al reported absorption at ~1180nm, fluorescence lifetime of 175 µs at room temperature for an emission peak at ~1500nm [6].…”

Section: Consequences For Nir-emitting Bi-doped Glassesmentioning

confidence: 82%

“…In last decade, a new family of near infrared (NIR) emitting bismuth doped laser glasses has been discovered and soon become a subject of intensive study [1][2][3][4][5][6]. This has been primarily due to the material's intriguing spectral properties, especially superbroadband photoemission in the telecom spectral range, which currently cannot be obtained in traditional rare-earth based materials [1,[3][4][5]7,8].…”

Section: Introductionmentioning

confidence: 99%

“…This has been primarily due to the material's intriguing spectral properties, especially superbroadband photoemission in the telecom spectral range, which currently cannot be obtained in traditional rare-earth based materials [1,[3][4][5]7,8]. Reports on basic materials properties and corresponding optical devices have convincingly proven the potential for application in superbroad optical amplifiers for future telecommunication networks and laser sources [1][2][3][4][5][6][7][8][9][10][11][12][13][14] . For example, addition of specific amounts of reducing agents such as carbon powder or gaseous hydrogen to Bi-containing glass batches was observed to enhance NIR emission of the corresponding glasses [ 1 8].…”

Section: Introductionmentioning

confidence: 99%

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Superbroad near-to-mid-infrared luminescence from Bi_5 ^3+ in Bi_5(AlCl_4)_3

Cao¹,

Peng²,

Wondraczek³

et al. 2012

Opt. Express

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Superbroad near-to-mid infrared (NIR-MIR) photoluminescence was observed from Bi 5 (AlCl 4 ) 3 at room temperature, spanning the spectral range of about 1000 to 4000 nm. On the basis of structural considerations and dynamic analyses, Bi 5 3+ clusters were identified as the optically active species, inherently differing from the species which is typically believed to be active in NIR-emitting Bi-doped glasses. In comparison to most other NIR-luminescent Bi-doped materials, the MIR-part of the luminescence spectrum is still present at room temperature. Emission intensity and excited state lifetime were found to exhibit abnormal temperature dependence, where the former increases with temperature up to a critical value of about 150 K. This behavior is related to a temperature-dependent overlap between ground state and excited states. The observed stabilization of MIR photoemission at room temperature may be a starting point for the development of Bi-based NIR-MIR light sources with superbroad emission spectrum, where Bi 5 3+ or similar polycationic species act as optical gain medium. (2)

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Section: Consequences For Nir-emitting Bi-doped Glassesmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Superbroad near-to-mid-infrared luminescence from Bi_5 ^3+ in Bi_5(AlCl_4)_3

Cao¹,

Peng²,

Wondraczek³

et al. 2012

Opt. Express

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“…Alternative solutions, like e.g. Raman [11,12] or relatively newly developed Bi-doped [13,14,15,16] fiber lasers require a long fiber length and core-pumping, both considered as disadvantages for high-power lasers. The main problem in establishing such YDFLs is athe high ASE level and athe parasitic lasing at shorter wavelengths [17].…”

Section: Introductionmentioning

confidence: 99%

YDFL Operating in 1150–1200-nm Spectral Domain

Dvoyrin

Medvedkov

Sorokina

2013

IEEE J. Quantum Electron.

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“…However, the poor lasing efficiency of BiDF laser, compared to the widely used rare-earth doped fiber lasers, requires further investigations. One possible reason that can impair the BiDF laser efficiency is the presence of high unsaturable loss in the fiber, which is temperature dependent [1,2]. Thus, temperature rise in the BiDF under strong pumping can be a limiting factor for such laser systems.…”

mentioning

confidence: 99%

Bismuth doped fiber laser performance on effective fiber cooling

Kalita

Yoo

Sahu

2009

CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference

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In the past, bismuth doped fiber (BiDF) lasers, operating in the 1160 -1300 nm wavelength range, have gained much attention as they are promising for many applications; including medical and astronomy. However, the poor lasing efficiency of BiDF laser, compared to the widely used rare-earth doped fiber lasers, requires further investigations. One possible reason that can impair the BiDF laser efficiency is the presence of high unsaturable loss in the fiber, which is temperature dependent [1,2]. Thus, temperature rise in the BiDF under strong pumping can be a limiting factor for such laser systems. Here, we report the dependence of BiDF laser efficiency on effective cooling of the fiber.The fiber laser was constructed with a 30 m long BiDF in a 100%-4% linear cavity, where a 15 W Yb doped fiber laser at 1090 nm served as the pump source. We used a broadband mirror in the high reflection end of the fiber to reflect back both pump and signal. The fiber had an absorption coefficient of 1.04 dB/m at 1090 nm and 0.23 dB/m at 1178 nm; measured by the cut-back method. The fiber core was 8 µm with a NA of 0.18, and the outer diameter was 125 µm.Figure 1(a) shows the BiDF laser output power in various heat sink arrangements. We found that at high pump powers the laser efficiency decreased when the fiber was cooled by natural convection. The rollover in output power was prominent at approximately 6 W of pump power at 24 0 C. An increase in fiber temperature was also observed during the experiment. To verify our results, the fiber temperature was further increased to 40 o C in air. A similar behaviour was observed and the efficiency dropped down to 2%. To provide more effective heat removal from the fiber, the fiber spool was then placed in a water tank at room temperature. An increase in efficiency, compared to that measured at room temperature, was observed with the water cooling. Moreover, no rollover in the output power was noticed. On further cooling the fiber to 10 o C in water, an increase in efficiency upto 10% was observed. We also raised the water temperature to 40 o C, and the efficiency dropped down to 4.8%, but no rollover was observed in the output power even at the maximum pump power. We further measured the unsaturable loss in our BiDF at the pump wavelength of 1090 nm, and at different temperatures [ Fig.1 (b)]. The fiber was dipped in water, so as to maintain the same temperature during the entire experiment. The ratio of unsaturable absorption to small signal absorption was 33, 30 and 28% at 40 o C, 20 o C and 10 o C respectively. It seems to indicate that, the gradual increase in fiber temperature with the pump power, in absence of forced cooling [Air-24 0 C and Air-40 0 C; both in Fig 1(a)], leads to a continuous rise in unsaturable loss in the BiDF, resulting in rollover in the 1178 nm output power. Thus, with effective cooling the BiDF laser performance can be significantly improved. References[1] M. P. Kalita, S. Yoo, and J. Sahu, "Bismuth doped fiber laser and study of unsaturable loss and pump indu...

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Efficient Bismuth-Doped Fiber Lasers

Cited by 74 publications

References 10 publications

Superbroad near-to-mid-infrared luminescence from Bi_5 ^3+ in Bi_5(AlCl_4)_3

Superbroad near-to-mid-infrared luminescence from Bi_5 ^3+ in Bi_5(AlCl_4)_3

YDFL Operating in 1150–1200-nm Spectral Domain

Bismuth doped fiber laser performance on effective fiber cooling

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