Efficient 16 μm linearly-polarized single-frequency phosphate glass fiber laser

Yang, Changsheng; Guan, Xianchao; Lin, Wei; Zhao, Qilai; Tang, Guowu; Gan, Jiulin; Qian, Qi; Feng, Zhouming; Yang, Zhongmin

doi:10.1364/oe.25.029078

Cited by 29 publications

(8 citation statements)

References 38 publications

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“…4. The 1.6-μm DBR seed laser emits an output power of 14 mW, a laser linewidth of 5.3 kHz and a polarization-extinction ratio (PER) of 20 dB, which is similar to our previous work [13]. The signal power from the seed laser is then amplified to 190 mW and 2.5 W by two pre-amplifiers (1 st pre-amplifier and 2 nd pre-amplifier) with 10/128-μm core/cladding-diameter active fiber, respectively.…”

Section: Methodssupporting

confidence: 82%

“…A linearly-polarized SFFL at 1603 nm with an output power of 20 mW and a laser linewidth of 1.9 kHz has been successfully achieved on the foundation of the heavily Er 3+ /Yb 3+ co-doped phosphate glass fiber in our group [13]. Unfortunately, for the 1.6 μm SFFLs all-fiber master-oscillator power-amplifier (MOPA) configuration, the output powers were usually limited within 20 W and slope efficiencies were around 20% in several experiments because of the low emission cross-section of Er 3+ ion near 1.6 μm [6,[14][15][16].…”

Section: Introductionmentioning

confidence: 97%

“…Unfortunately, for the 1.6 μm SFFLs all-fiber master-oscillator power-amplifier (MOPA) configuration, the output powers were usually limited within 20 W and slope efficiencies were around 20% in several experiments because of the low emission cross-section of Er 3+ ion near 1.6 μm [6,[14][15][16]. Besides, the power scaling of 1.6-μm lasers is facile to be saturated, and the signal characteristics severely degrade due to a large amount of the amplified spontaneous emission (ASE) [13,17]. Usually, more pump power and longer active fiber can offer more gain for signal light in MOPA system.…”

Section: Introductionmentioning

confidence: 99%

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High-efficiency and high-power single-frequency fiber laser at 1.6 μm based on cascaded energy-transfer pumping

et al. 2020

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In this paper, a technique combing cascaded energy-transfer pumping (CEP) method and master-oscillator power-amplifier (MOPA) configuration is proposed for power scaling of 1.6-μm-band single-frequency fiber lasers (SFFLs), where the Er 3+ ion has a limited gain. The CEP technique is fulfilled by coupling a primary signal light at 1.6 μm and a C-band auxiliary laser. The numerical model of the fiber amplifier with the CEP technique reveals that the energy transfer process involves the pump competition and the in-band particle transition between the signal and auxiliary lights. Moreover, for the signal emission, the population density in the upper level is enhanced and the effective population inversion is achieved due to the CEP. A single-frequency MOPA laser at 1603 nm with an output power of 52.6 W and an improved slope efficiency of 30.4% is obtained experimentally through the CEP technique. Besides, a laser linewidth of 5.2 kHz and a polarization-extinction ratio of ~18 dB are obtained at the maximum output power. The proposed technique provides an optional method of increasing the slope efficiency and power scaling for fiber lasers operating at L-band.

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Section: Methodssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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High-efficiency and high-power single-frequency fiber laser at 1.6 μm based on cascaded energy-transfer pumping

et al. 2020

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“…Usually, the Lorentzian linewidth of the self-heterodyne spectrum is used to characterize the laser linewidth, requiring the delay fiber of the DSHM must be at least five times longer than the coherence length of the laser under test [6,7]. Recently, the linewidths of commercial lasers have been decreased to the order of kilohertz, for which a delay fiber over hundreds of kilometers is requested by DSHM [8,9]. However, such a long fiber will cause high propagation loss, the polarization-induced fading, and the broadening spectrum, affecting accurate measurement of linewidth [10].…”

Section: Introductionmentioning

confidence: 99%

A Polarization-Insensitive Recirculating Delayed Self-Heterodyne Method for Sub-Kilohertz Laser Linewidth Measurement

et al. 2021

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A polarization-insensitive recirculating delayed self-heterodyne method (PI-RDSHM) is proposed and demonstrated for the precise measurement of sub-kilohertz laser linewidths. By a unique combination of Faraday rotator mirrors (FRMs) in an interferometer, the polarization-induced fading is effectively reduced without any active polarization control. This passive polarization-insensitive operation is theoretically analyzed and experimentally verified. Benefited from the recirculating mechanism, a series of stable beat spectra with different delay times can be measured simultaneously without changing the length of delay fiber. Based on Voigt profile fitting of high-order beat spectra, the average Lorentzian linewidth of the laser is obtained. The PI-RDSHM has advantages of polarization insensitivity, high resolution, and less statistical error, providing an effective tool for accurate measurement of sub-kilohertz laser linewidth.

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“…In general, for fiber lasers operating at L-band, the population inversion of the EDF should be limited to a low level (30%-40%) to obtain a positive gain at 1.6 μm, while it is negative at 1.55 μm [18]. The low population inversion could be achieved by various approaches, such as controlling the cavity losses [18][19][20], lengthening the EDF [21][22][23], using highly doped fibers [24][25][26], or cascading different types of the EDFs [12,13]. However, no matter which approach is used, the length of the EDF is usually several meters, even tens of meters in some works.…”

Section: Introductionmentioning

confidence: 99%

L-band mode-locked femtosecond fiber laser with gigahertz repetition rate

2019

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We demonstrate an L-band passively mode-locked femtosecond fiber laser with a fundamental repetition rate of 1.013 GHz based on semiconductor saturable-absorber mirror (SESAM). Compared with other reported L-band fiber lasers which use overlong Er-doped fiber (EDF), the laser here consists of 10 cm heavily doped fiber to increase the fundamental pulse repetition rate to gigahertz level. An output ratio as low as 0.2% is used to make the central wavelength up to 1.6 μm. The laser operates at the soliton regime with a 3 dB spectral bandwidth of 13.6 nm, and a pulse duration of 229 fs.

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Efficient 16 μm linearly-polarized single-frequency phosphate glass fiber laser

Cited by 29 publications

References 38 publications

High-efficiency and high-power single-frequency fiber laser at 1.6 μm based on cascaded energy-transfer pumping

High-efficiency and high-power single-frequency fiber laser at 1.6 μm based on cascaded energy-transfer pumping

A Polarization-Insensitive Recirculating Delayed Self-Heterodyne Method for Sub-Kilohertz Laser Linewidth Measurement

L-band mode-locked femtosecond fiber laser with gigahertz repetition rate

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