Nanomaterials

Research

10 pages, 2107 KiB

Open AccessArticle

Dumbbell-Shaped Ho-Doped Fiber Laser Mode-Locked by Polymer-Free Single-Walled Carbon Nanotubes Saturable Absorber

by Serafima A. Filatova, Vladimir A. Kamynin, Yuriy G. Gladush, Dmitry V. Krasnikov, Albert G. Nasibulin and Vladimir B. Tsvetkov

Nanomaterials 2023, 13(10), 1581; https://doi.org/10.3390/nano13101581 - 9 May 2023

Cited by 2 | Viewed by 1285

Abstract

We propose a simple dumbbell-shaped scheme of a Holmium-doped fiber laser incorporating a minimum number of optical elements. Mode-locking regimes were realized with the help of polymer-free single-walled carbon nanotubes (SWCNTs) synthesized using an aerosol (floating catalyst) CVD method. We show that such [...] Read more.

We propose a simple dumbbell-shaped scheme of a Holmium-doped fiber laser incorporating a minimum number of optical elements. Mode-locking regimes were realized with the help of polymer-free single-walled carbon nanotubes (SWCNTs) synthesized using an aerosol (floating catalyst) CVD method. We show that such a laser scheme is structurally simple and more efficient than a conventional one using a ring cavity and a similar set of optical elements. In addition, we investigated the effect of SWCNT film transmittance, defined by the number of 40 nm SWCNT layers on the laser’s performance: operating regimes, stability, and self-starting. We found that three SWCNT layers with an initial transmittance of about 40% allow stable self-starting soliton mode-locking at a wavelength of 2076 nm with a single pulse energy of 0.6 nJ and a signal-to-noise ratio of more than 60 dB to be achieved. Full article

(This article belongs to the Special Issue Advanced Fiber Laser)

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9 pages, 2144 KiB

Open AccessCommunication

Single and Bunch Soliton Generation in Optical Fiber Lasers Using Bismuth Selenide Topological Insulator Saturable Absorber

by Hazlihan Haris, Tan Sin Jin, Malathy Batumalay, Ahmad Razif Muhammad, Jahariah Sampe, Arni Munira Markom, Huda Adnan Zain, Sulaiman Wadi Harun, Megat Muhammad Ikhsan Megat Hasnan and Ismail Saad

Nanomaterials 2023, 13(9), 1538; https://doi.org/10.3390/nano13091538 - 3 May 2023

Viewed by 1697

Abstract

In this work, we present the generation of two distinct types of soliton pulses using a Bismuth Selenide (Bi₂Se₃) saturable absorber (SA) synthesized in our laboratory. The soliton pulses were generated in two different laser cavity configurations, resulting in [...] Read more.

In this work, we present the generation of two distinct types of soliton pulses using a Bismuth Selenide (Bi₂Se₃) saturable absorber (SA) synthesized in our laboratory. The soliton pulses were generated in two different laser cavity configurations, resulting in two types of solitons: a soliton pulse with Kelly sidebands and a bunched soliton pulse with peak-dip sidebands. Both solitons operated at the fundamental repetition rate—23.3 MHz (for the soliton with Kelly sidebands) and 13 MHz (for the bunched soliton with peak-dip sidebands). We observed that the accumulation of nonlinear phase shift from the added single mode fiber (SMF) split the single soliton pulse into 44 pulses in a bunched oscillation envelope. At the same time, peak-dip sidebands were imposed on the bunched soliton spectrum due to constructive and destructive interferences between soliton pulse and dispersive waves. The measured pulse width for both solitons were 0.63 ps (for the soliton with Kelly sidebands) and 1.52 ps (for the bunched soliton with peak-dip sidebands), respectively. Our results demonstrate the potential of Bi₂Se₃ SAs in generating different types of soliton pulses, which could have potential applications in various areas of optical communication and spectroscopy. Full article

(This article belongs to the Special Issue Advanced Fiber Laser)

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9 pages, 3146 KiB

Open AccessArticle

A 2 kW, 8 GHz-Linewidth Yb-Doped Polarization-Maintained Fiber Laser with Quasi-Flat-Top Pseudo Random Binary Sequence Phase Modulation for SBS Suppression

by Dong Joon Kim, Joonhoi Koo, Seung Won Jun, Hwanseong Jeong, Hwihyeong Lee, Jung Hwan Lee and Minsik Jo

Nanomaterials 2023, 13(8), 1329; https://doi.org/10.3390/nano13081329 - 10 Apr 2023

Cited by 1 | Viewed by 1550

Abstract

We demonstrated a narrow-linewidth high-power Yb-doped polarization-maintaining (PM) fiber laser with near-diffraction-limited beam. The laser system consisted of a phase-modulated single-frequency seed source and four-stage amplifiers in the master oscillator power amplifier configuration. A quasi-flat-top pseudo random binary sequence (PRBS) phase-modulated single-frequency laser [...] Read more.

We demonstrated a narrow-linewidth high-power Yb-doped polarization-maintaining (PM) fiber laser with near-diffraction-limited beam. The laser system consisted of a phase-modulated single-frequency seed source and four-stage amplifiers in the master oscillator power amplifier configuration. A quasi-flat-top pseudo random binary sequence (PRBS) phase-modulated single-frequency laser with a linewidth of 8 GHz was injected into the amplifiers for suppressing stimulated Brillouin scattering. The quasi-flat-top PRBS signal was readily generated from the conventional PRBS signal. The maximum output power was 2.01 kW with polarization extinction ratio (PER) of ~15 dB. The beam quality (M2) was less than 1.3 over the power scaling range. Full article

(This article belongs to the Special Issue Advanced Fiber Laser)

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12 pages, 4472 KiB

Open AccessArticle

Low-Threshold, Multiple High-Order Harmonics Fiber Laser Employing Cr₂Si₂Te₆ Saturable Absorber

by Nannan Xu, Xinxin Shang, Shuo Sun, Fuhao Yang, Weiyu Fan, Huanian Zhang and Dengwang Li

Nanomaterials 2023, 13(6), 1038; https://doi.org/10.3390/nano13061038 - 14 Mar 2023

Cited by 4 | Viewed by 1585

Abstract

Abundant research findings have proved the value of two-dimensional (2D) materials in the study of nonlinear optics in fiber lasers. However, there remains two problems: how to reduce the start-up threshold, and how to improve the damage threshold, of fiber lasers based on [...] Read more.

Abundant research findings have proved the value of two-dimensional (2D) materials in the study of nonlinear optics in fiber lasers. However, there remains two problems: how to reduce the start-up threshold, and how to improve the damage threshold, of fiber lasers based on 2D materials. A 15.1 mW low-threshold mode-locked fiber laser, based on a Cr₂Si₂Te₆ saturable absorber (SA) prepared by the liquid-phase exfoliation method, is demonstrated successfully in this work. This provides a useful and economical method to produce SAs with low insertion loss and low saturation intensity. Besides, multiple high-order harmonics, from the fundamental frequency (12.6 MHz) to the 49th-order harmonic (617.6 MHz), mode-locked operations are recorded. The experimental results indicate the excellent potential of Cr₂Si₂Te₆ as an optical modulator in exploring the soliton dynamics, harmonic mode locking, and other nonlinear effects in fiber lasers. Full article

(This article belongs to the Special Issue Advanced Fiber Laser)

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11 pages, 2573 KiB

Open AccessArticle

Multi-Pulse Bound Soliton Fiber Laser Based on MoTe₂ Saturable Absorber

by Bo Guo, Xinyu Guo, Renlai Zhou, Zhongyao Ren, Qiumei Chen, Ruochen Xu and Wenbin Luo

Nanomaterials 2023, 13(1), 177; https://doi.org/10.3390/nano13010177 - 30 Dec 2022

Cited by 8 | Viewed by 1615

Abstract

Bound solitons have become a hot topic in the field of nonlinear optics due to their potential applications in optical communication, information processing and radar systems. However, the trapping of the cascaded bound soliton is still a major challenge up to now. Here, [...] Read more.

Bound solitons have become a hot topic in the field of nonlinear optics due to their potential applications in optical communication, information processing and radar systems. However, the trapping of the cascaded bound soliton is still a major challenge up to now. Here, we propose and experimentally demonstrate a multi-pulse bound soliton fiber laser based on MoTe₂ saturable absorber. In the experiment, MoTe₂ nanosheets were synthesized by chemical vapor deposition and transferred to the fiber taper by optical deposition. Then, by inserting the MoTe₂ saturable absorber into a ring cavity laser, the two-pulse, three-pulse and four-pulse bound solitons can be stably generated by properly adjusting the pump strength and polarization state. These cascaded bound solitons are expected to be applied to all-optical communication and bring new ideas to the study of soliton lasers. Full article

(This article belongs to the Special Issue Advanced Fiber Laser)

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12 pages, 3908 KiB

Open AccessArticle

Femtosecond Er-Doped All-Fiber Laser with High-Density Well-Aligned Carbon-Nanotube-Based Thin-Film Saturable Absorber

by Dmitriy A. Dvoretskiy, Stanislav G. Sazonkin, Ilya O. Orekhov, Igor S. Kudelin, Lev K. Denisov, Valeriy E. Karasik, Viatcheslav N. Agafonov, Valery N. Khabashesku and Valeriy A. Davydov

Nanomaterials 2022, 12(21), 3864; https://doi.org/10.3390/nano12213864 - 2 Nov 2022

Cited by 3 | Viewed by 1653

Abstract

We have studied the ultrafast saturation behavior of a high-density well-aligned single-walled carbon nanotubes saturable absorber (HDWA-SWCNT SA), obtained by a high-pressure and high-temperature treatment of commercially available single-wall carbon nanotubes (SWCNTs) and related it to femtosecond erbium-doped fiber laser performance. We have [...] Read more.

We have studied the ultrafast saturation behavior of a high-density well-aligned single-walled carbon nanotubes saturable absorber (HDWA-SWCNT SA), obtained by a high-pressure and high-temperature treatment of commercially available single-wall carbon nanotubes (SWCNTs) and related it to femtosecond erbium-doped fiber laser performance. We have observed the polarization dependence of a nonlinear optical saturation, along with a low saturation energy level of <1 fJ, limited to the detector threshold used, and the ultrafast response time of <250 fs, while the modulation depth was approximately 12%. We have obtained the generation of ultrashort stretched pulses with a low mode-locking launching threshold of ~100 mW and an average output power of 12.5 mW in an erbium-doped ring laser with the hybrid mode-locking of a VDVA-SWNT SA in combination with the effects of nonlinear polarization evolution. Dechirped pulses with a duration of 180 fs were generated, with a repetition rate of about 42.22 MHz. The average output power standard deviation was about 0.06% RMS during 3 h of measurement. Full article

(This article belongs to the Special Issue Advanced Fiber Laser)

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11 pages, 2045 KiB

Open AccessArticle

Cooling a Rotating Mirror Coupled to a Single Laguerre–Gaussian Cavity Mode Using Parametric Interactions

by Qiaoyun Pan, Weiyu Lv, Li Deng, Sumei Huang and Aixi Chen

Nanomaterials 2022, 12(20), 3701; https://doi.org/10.3390/nano12203701 - 21 Oct 2022

Cited by 2 | Viewed by 1330

Abstract

We study the cooling of a rotating mirror coupled to a Laguerre–Gaussian (L–G) cavity mode, which is assisted by an optical parametric amplifier (OPA). It is shown that the presence of the OPA can significantly lower the temperature of the rotating mirror, which [...] Read more.

We study the cooling of a rotating mirror coupled to a Laguerre–Gaussian (L–G) cavity mode, which is assisted by an optical parametric amplifier (OPA). It is shown that the presence of the OPA can significantly lower the temperature of the rotating mirror, which is very critical in the application of quantum physics. We also find that the increase in angular momentum has an influence on the cooling of the rotating mirror. Our results may provide a potential application in the determination of the orbital angular momentum of light fields and precision measurement. Full article

(This article belongs to the Special Issue Advanced Fiber Laser)

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8 pages, 4669 KiB

Open AccessArticle

3.96 kW All-Fiberized Linearly Polarized and Narrow Linewidth Fiber Laser with Near-Diffraction-Limited Beam Quality

by Shuai Ren, Pengfei Ma, Wei Li, Guangjian Wang, Yisha Chen, Jiaxin Song, Wei Liu and Pu Zhou

Nanomaterials 2022, 12(15), 2541; https://doi.org/10.3390/nano12152541 - 24 Jul 2022

Cited by 15 | Viewed by 1764

Abstract

In this paper, we realize a 3.96 kW all-fiberized and polarization-maintained (PM) amplifier with narrow linewidth and near-diffraction-limited beam quality. Based on a master oscillator power amplifier (MOPA) configuration seeded with phase-modulated single-frequency laser, a 3.96 kW signal laser is achieved with a [...] Read more.

In this paper, we realize a 3.96 kW all-fiberized and polarization-maintained (PM) amplifier with narrow linewidth and near-diffraction-limited beam quality. Based on a master oscillator power amplifier (MOPA) configuration seeded with phase-modulated single-frequency laser, a 3.96 kW signal laser is achieved with a 3 dB linewidth of 0.62 nm at the pump power of 5.02 kW. At the maximum output power, the polarization extinction ratio (PER) is ~13.9 dB, and the beam quality (M² factor) is M²_x = 1.31, M²_y = 1.41. As far as we know, this is the maximum output power of PM narrow linewidth fiber laser with near-diffraction-limited beam quality and all-fiber format. Full article

(This article belongs to the Special Issue Advanced Fiber Laser)

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