SWCNT@BNNT With 1D Van Der Waals Heterostructure With a High Optical Damage Threshold for Laser Mode-Locking

Zhang, Zheyuan; Sun, Xiangnan; Yuan, Peng; Yokokawa, Shoko; Zheng, Yongjia; Jiang, Hongbo; Liu, Jin; Anisimov, Anton S.; Kauppinen, Esko I.; Xiang, Rong; Maruyama, Shigeo; Yamashita, Shinji; Set, Sze Yun

doi:10.1109/jlt.2021.3092522

Cited by 7 publications

(5 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 231 ] Besides, sol–gel films have less scattering loss, which increases the laser output power and reduces the α ns . [ 232 ] In another method, Set et al [ 233 ] proposed an encapsulated SWCNT in boron nitride nanotube (BNNT), in which the SWCNT serves as a baseplate and the BNNT was deposited on it coaxially like a cladding. The BNNT has high resistance to thermal oxidation up to 900 °C which outperforms other polymers.…”

Section: Challenges and Recommendationsmentioning

confidence: 99%

A Comparison for Saturable Absorbers: Carbon Nanotube Versus Graphene

Lau

Liu

Qiu

2022

Advanced Photonics Research

View full text Add to dashboard Cite

Saturable absorption is a nonlinear optical phenomenon that is characterized by the reduced optical loss at high light intensity. At low light intensity, the saturable absorber (SA) absorbs light and results in an optical loss. When the light intensity is increased, the available energy states become depleted, leading to a reduction in absorption. For semiconductors, the saturated optical absorption under strong excitation is in conjunction with the Pauli expulsion of occupying carriers at the edge of the filled conduction band thus allowing photons to penetrate through the material without further absorption. [1] When incorporated into a mode-locked laser cavity, the saturable absorption process begins from the inherent noise fluctuations of a laser cavity. A dominant noise spike with the highest intensity will saturate the absorber and decreases the absorbance loss such as the pedestal peaks. [2] Next, this noise spike is amplified in subsequent round trips until a stable pulse train is eventually formed. This favors the generation of ultrafast laser pulses over continuous-wave laser operation. During the formation of ultrafast laser pulses, the SA is operated either as slow or fast SA. The main difference between these two SA configurations is their relaxation time. The relaxation time of a slow SA is longer than its pulse duration measured from the mode-locked laser. The long time constant results in reduced saturation intensity due to slow recovery of absorption. [3] Therefore, the slow SA self-starts the modelocked laser at a lower power threshold. In contrast, the relaxation time of fast SA is shorter than its pulse duration measured from the mode-locked laser. Owing to the fast relaxation time, the electrons in the conduction band will return to the valence band at a period shorter than the pulse duration. This constitutes the higher power threshold to self-start the mode-locked laser.Despite the difficulty to self-start the mode-locking, the fast SA is responsible for the stabilization of the laser. The fast SA has ultrafast carrier relaxation time for the SA to recover from bleaching with minimal time. [4] Besides stabilization, ultrafast relaxation time is also crucial to shortening the pulse duration of the mode-locked laser. [5] Before the advent of ultrashort pulse with relaxation time ranging from a few ps to a few hundred fs, semiconductor saturable absorber mirror (SESAM) was demonstrated with a complex post-fabrication process. For instance, ion implantation is needed to reduce its relaxation time to ps time scale. This encourages the discovery of a material with sub-picosecond recovery time, such as carbon nanotube (CNT) [6] and graphene. [7] Both CNT and graphene have ultrafast and slow recovery from saturation. In a femtosecond laser, the CNT will typically act as a slow SA due to its recovery time of few ps, whereas the graphene will typically act as a fast SA due to its

show abstract

Section: Challenges and Recommendationsmentioning

confidence: 99%

A Comparison for Saturable Absorbers: Carbon Nanotube Versus Graphene

Lau

Liu

Qiu

2022

Advanced Photonics Research

View full text Add to dashboard Cite

show abstract

“…We have also varied the ultrashort pulse durations (see Figure 4 b) in the wide range of 0.25–28 ps (at the FWHM pulse intensity level) by controlling the length of the output fiber SMF-28 using a homemade ultrashort pulse fiber laser [ 41 ]. Moreover, carbon nanotubes, doped with boron nitride, serve as an ideal platform for creating laser saturated absorbers, as well as a short response time, from a high modulation depth [ 28 , 42 , 44 ]. However, compared to C:BNNT, high-density SWCNTs films have the advantage of a much lower level of saturation energy and higher resistance to radiation damage.…”

Section: Production and Nonlinear Optical Properties Of An Hdwa-swcnt...mentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

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.

show abstract

“…The unique geometry of hetero-nanotubes may result in other interesting physical and chemical properties and enable other possibilities from many aspects beyond photoelectronic and photovoltaic devices, which are being discussed in recent publications from various research groups [16,[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. For example, Zhang et al [42] studied the property of a SWCNT-BNNT 1D heterostructure film as the saturable absorber and demonstrated a high optical damage threshold; Suzuki et al [38] observed a memristive behavior in CNT-BNNT heterostructure bulk assemblies and proposed these fibers could be useful for future neuromorphic computing and conventional nonvolatile memory devices. Also, the performance of 1D heterostructures in an electrochemical reaction is also interesting and could be quickly investigated.…”

Section: Macrostructures and Their Applicationsmentioning

confidence: 99%

Building blocks for one-dimensional van der Waals heterostructures

Xiang¹,

Maruyama²,

Li³

2022

NSO

Self Cite

View full text Add to dashboard Cite

We recently demonstrated experimentally the synthesis of one-dimensional (1D) van der Waals (vdW) heterostructure, where single-crystal hexagonal boron nitride or molybdenum disulfide nanotubes seamlessly wrapped a singlewalled carbon nanotube and formed a coaxial hetero-nanotube with the diameter typically being 1-5 nm. 1D vdW heterostructures have created large room for fundamental research from synthesis to application, but most directions are still at their initial stages. The materials that can be employed to construct 1D vdW heterostructures are limited to only a few types. In this review, we provide an outlook to the question: what are the building blocks available now and could be available in the future for the fabrication of 1D vdW heterostructures?

show abstract

SWCNT@BNNT With 1D Van Der Waals Heterostructure With a High Optical Damage Threshold for Laser Mode-Locking

Cited by 7 publications

References 33 publications

A Comparison for Saturable Absorbers: Carbon Nanotube Versus Graphene

A Comparison for Saturable Absorbers: Carbon Nanotube Versus Graphene

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

Building blocks for one-dimensional van der Waals heterostructures

Contact Info

Product

Resources

About