Ultra-short wavelength operation of thulium-doped fiber amplifiers and lasers

Chen, Shaoxiang; Jung, Yongmin; Alam, Shaif-ul; Richardson, David J.; Sidharthan, Raghuraman; Ho, Daryl; Yoo, Seongwoo; Daniel, J. M. O.

doi:10.1364/oe.27.036699

Cited by 54 publications

(23 citation statements)

References 18 publications

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“…These values are higher than previously published for BDFAs [17] and also higher then reported for the short-wavelength Al/Tm-doped fiber amplifier presented in [7]. A similar small signal gain was obtained in [8], where a Ge/Tm-doped fiber was used.…”

Section: Discussionsupporting

confidence: 55%

“…Thulium-doped fiber amplifiers (TDFAs) can be used in this spectral region. However, because these wavelengths are at the edge of the thulium gain band, the highest demonstrated saturation power near 1650 nm was less than 50 mW [7,8]. Raman amplifiers are capable of providing much higher output powers, but require long (about 1 km or more) pieces of specialty fiber [9] and very high (watt level) pumping powers [10].…”

Section: Introductionmentioning

confidence: 99%

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Operation of a Single-Frequency Bismuth-Doped Fiber Power Amplifier near 1.65 µm

et al. 2020

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The spectral range between 1650 and 1700 nm is an interesting region due to its potential applications in optical telecommunication and optical-based methane sensing. Unfortunately, the availability of compact and simple optical amplifiers with output powers exceeding tens of milliwatts in this spectral region is still limited. In this paper, a single-frequency continuous-wave bismuth-doped fiber amplifier (BDFA) operating at 1651 and 1687 nm is presented. With the improved signal/pump coupling and modified pump source design, the output powers of 163 mW (at 1651 nm) and 197 mW (at 1687 nm) were obtained. Application of the BDFA to the optical spectroscopy of methane near 1651 nm is also described. We demonstrate that the BDFA can be effectively used for signal amplitude enhancement in photothermal interferometry.

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Section: Discussionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Operation of a Single-Frequency Bismuth-Doped Fiber Power Amplifier near 1.65 µm

et al. 2020

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“…Указанный диапазон длин волн привлекателен не только для лидарных технологий, но также широко используется в медицине, связи, научных исследованиях [2][3][4][5]. Такие приборы с высокой чистотой спектра, могут заполнить дефицит мощных лазерных источников, диапазон длин волн которых находится между диапазоном длин волн волоконных усилителей на основе эрбия и диапазоном длин волн современных усилителей и лазеров на основе тулия [6].…”

Section: в лидарных технологиях определения содержания метана в атмосферахunclassified

Bipolarized Raman amplification for lidar transmitter.

Grigorievsky¹,

Ras²,

Tezadov³

2021

JRE

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A comparison is made of the spectral distortions of the output radiation of a Raman amplifier in the case of one and two-polarization amplification of modulated radiation in an extended optical fiber. With an output power of 3.5 W at a wavelength of 1649 nm, the spectral distortions for bipolarization amplification are lower, which makes it possible to increase the amplifier output power to ~ 4 W, and the level of spectral distortions at the amplifier output makes possible to carry out lidar measurements of methane concentration by a remote method with high accuracy. Simulation of bipolarization Raman amplification was carried out along with experimental verification. For this simulation, the coefficient of depolarization of radiation propagating in an extended single-mode fiber was introduced. The experimental results and the results of theoretical modeling are in good agreement. An increase in the amplifier power also makes it possible to increase the methane sensing range in an open atmosphere with lidars using Raman amplifiers as transmitters.

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“…This model applies to Tmdoped fibres with 3 H 6 → 3 F 4 pump scheme. Figure 1 predicts spectral gain profiles of Tm-doped fibre (used in further investigations) to red-shift at higher excitation level [17,18,19,20]. Control of the laser cavity Q-factor allows efficient governing of an excitation level of gain, leveraging output power and laser generation wavelength.…”

Section: Introductionmentioning

confidence: 99%

Gain-controlled Broadband Tuneability in Mode-locked Thulium-doped Fibre Laser through Variable Feedback

Kirsch¹,

Bednyakova²,

Cadier³

et al. 2021

Preprint

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Broadband wavelength tuneability can ensure a new level of versatility for laser systems and extend areas of their applications. Principle limitations of achieving wide tuning wavelength ranges are generally defined by the spectral bandwidth of the gain and traditional tuneability techniques, relying on electrically controlled or bulk filters, reducing laser efficiency and generation stability. In this work, we present nearly 90 nm tuneability in ultrafast Tm-doped fibre laser within the span from 1873 to 1962 nm by implementing variable feedback for efficient control of the excitation level of the active medium and, hence, the gain spectrum. The highest laser efficiency is observed with 20% feedback, generating 580-fs soliton pulses at 1877 nm central wavelength with 1.5 nJ output pulse energy. By combining the nonlinear Shrödinger equation and population inversion rate equations for the gain medium, the developed numerical model helps to unveil nonlinear pulse evolution under the influence of dynamically varying gain spectrum. The resulting laser system presents a compact and straightforward approach to achieve laser generation with a broad range tuneability of wavelength and operation regimes, which is not impaired by the limitations on laser stability or power performance and can be translated to other wavelength ranges.

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Ultra-short wavelength operation of thulium-doped fiber amplifiers and lasers

Cited by 54 publications

References 18 publications

Operation of a Single-Frequency Bismuth-Doped Fiber Power Amplifier near 1.65 µm

Operation of a Single-Frequency Bismuth-Doped Fiber Power Amplifier near 1.65 µm

Bipolarized Raman amplification for lidar transmitter.

Gain-controlled Broadband Tuneability in Mode-locked Thulium-doped Fibre Laser through Variable Feedback

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