Cladding-pumped bismuth-doped fiber lasers operating at a wavelength region of 1.4–1.5 µm

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This article reports the results on development and study of the output characteristics of bismuth-doped fiber lasers for the near-IR range, which are pumped into a cladding using multimode laser diodes emitting at a wavelength of 808 nm. The active medium of such lasers was bismuth-doped germanosilicate glass fibers with various shapes (circular and square sections) of the inner cladding coated with a polymer having a refractive index of 1.396. On the basis of such fibers, a series of lasers generating radiation in the wavelength range 1.4–1.5 μm was developed, and their spectral and power characteristics were studied. Numerical simulation was also carried out aimed at finding the optimal configuration of such lasers in order to determine the maximum achievable characteristics of these devices. A good agreement between the calculated data and the experimental results has been obtained. As a result, using a bismuth-doped active fiber with a square cross section of ~80 μm and a core diameter of ~11 μm, a fiber laser was created that operated at a wavelength of ~1460 nm, with a slope efficiency of about 5% and a maximum output power of more than 250 mW.

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Sobre autores

A. Vakhrushev

Prokhorov General Physics Institute of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: as.vahrush@yandex.ru

Dianov Fiber Optics Research Center of the Russian Academy of Sciences

Rússia, Moscow

A. Kharakhordin

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: as.vahrush@yandex.ru

Dianov Fiber Optics Research Center of the Russian Academy of Sciences

Rússia, Moscow

S. Alyshev

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: as.vahrush@yandex.ru

Dianov Fiber Optics Research Center of the Russian Academy of Sciences

Rússia, Moscow

A. Khegai

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: as.vahrush@yandex.ru

Dianov Fiber Optics Research Center of the Russian Academy of Sciences

Rússia, Moscow

E. Firstova

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: as.vahrush@yandex.ru

Dianov Fiber Optics Research Center of the Russian Academy of Sciences

Rússia, Moscow

M. Melkumov

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: as.vahrush@yandex.ru

Dianov Fiber Optics Research Center of the Russian Academy of Sciences

Rússia, Moscow

S. Firstov

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: as.vahrush@yandex.ru

Dianov Fiber Optics Research Center of the Russian Academy of Sciences

Rússia, Moscow

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2. Fig. 1. Absorption spectra obtained by introducing a weak optical signal into the shell of the studied optical fibers (a); diagram of the energy transitions of VAC-Si when excited by radiation at a wavelength of 800 nm, indicating the main transitions (b).

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3. Fig. 2. Diagram of a bismuth laser pumped into a shell in different configurations.

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4. Fig. 3. Calculated values of the output power of bismuth lasers operating at a wavelength of 1460 nm: a – from the reflection coefficient of the output mirror and the length of the active light guide, with a fixed absorbed pumping power of 8.5 W; b – from the reflection coefficient of the output mirror and the pumping power, with a length of the active light guide of 200 m.

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5. Fig. 4. Dependences of the output power of the bismuth laser on the absorbed pumping power: a – for the Bi-1 sample in different resonator configurations; b – for the Bi-1 and Bi-2 samples under the same conditions. The insert is a typical laser generation spectrum.

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6. Fig. 5. Dependences of the output power of a bismuth laser with different active fiber lengths on the absorbed power. The insertion is the differential efficiency of lasers from the length of the fiber.

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