Self-starting mode-locked Cr:ZnS laser using single-walled carbon nanotubes with resonant absorption at 24  μm

Okazaki, Daiki; Arai, Hiromichi; Anisimov, Anton S.; Kauppinen, Esko I.; Chiashi, Shohei; Maruyama, Shigeo; Saito, Norihito; Ashihara, Satoshi

doi:10.1364/ol.44.001750

Cited by 28 publications

(8 citation statements)

References 25 publications

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“…4(a). The pump source, the cavity mirrors, and the tools for characterizing output pulses are almost the same as in our previous report [30], but there are some modifications, described as follows.…”

Section: Cr:zns Mode-locked Oscillation Propertiesmentioning

confidence: 99%

“…Selective growth of SWCNTs with a certain mean diameter has been developed to locate the exciton resonance at wavelengths above 2 µm [29]. We have recently applied SWCNTs with a mean diameter of 2.2 nm and exciton resonance at 2.4 µm to self-start mode locking in a Cr:ZnS laser [30]. Their saturable absorption properties, however, have not yet been elucidated.…”

Section: Introductionmentioning

confidence: 99%

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Ultrafast saturable absorption of large-diameter single-walled carbon nanotubes for passive mode locking in the mid-infrared

Okazaki¹,

Morichika²,

Arai³

et al. 2020

Opt. Express

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We study the saturable absorption properties of single-walled carbon nanotubes (SWCNTs) with a large diameter of 2.2 nm and the corresponding exciton resonance at a wavelength of 2.4 µm. At resonant excitation, a large modulation depth of approximately 30 % and a small saturation fluence of a few tens of µJ/cm 2 are evaluated. The temporal response is characterized by an instantaneous rise and a subpicosecond recovery. We also utilize the SWCNTs to realize sub-50 fs, self-start mode locking in a Cr:ZnS laser, revealing that the film thickness is an important parameter that affects the possible pulse energy and duration. The results prove that semiconductor SWCNTs with tailored diameters exceeding 2 nm are useful for passive mode locking in the mid-infrared range.

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Section: Cr:zns Mode-locked Oscillation Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrafast saturable absorption of large-diameter single-walled carbon nanotubes for passive mode locking in the mid-infrared

Okazaki¹,

Morichika²,

Arai³

et al. 2020

Opt. Express

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“…These materials have high flexibility, and the material cost is lower than that of inorganic thermoelectric materials. In particular, single-walled carbon nanotube (SWCNT) is a very promising material for thermoelectric devices, and other fields such as fuel cells, solar cells, and so on [22][23][24][25][26][27] . SWCNTs represent a unique 1D carbon allotrope with structural, electrical, and thermal properties that enable efficient thermoelectric energy conversion using the quantum-confinement effect [28][29][30][31] .…”

mentioning

confidence: 99%

Facile preparation of air-stable n-type thermoelectric single-wall carbon nanotube films with anionic surfactants

Seki

Nagata

Takashiri

2020

Sci Rep

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thermoelectric generators based on single-wall carbon nanotubes (SWcnts) have great potential for use in wearable and skin electronics because of their lightweight and mechanically soft structure. However, the fabrication of air-stable n-type thermoelectric SWcnts using conventional processes is challenging. Herein, we propose a facile process for fabricating air-stable n-type SWCNT films with anionic surfactants via drop casting followed by heat treatment. We examined different surfactants (Sodium Dodecyl Sulfate, Sodium Dodecylbenzene Sulfonate, and Sodium cholate) and heat-treatment temperatures. The optimal SWCNT film maintained the n-type Seebeck coefficient for 35 days. Moreover, to further extend the n-type Seebeck coefficient maintenance, we periodically reheated the SWCNT film with a surfactant that had returned to the p-type Seebeck coefficient. The reheated film recovered the n-type Seebeck coefficient, and the effect of the reheating treatment lasted for several reheating cycles. finally, we elucidated a simple mechanism for realizing an air-stable n-type Seebeck coefficient based on spectroscopic analyses of the SWCNT films.

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“…ドロックレーザーが開発された [13][14][15] ．現在では， Cr:ZnSe だけでなく，Cr:ZnS，Cr:CdSe，Fe:ZnSe 等，様々なレーザー材料を用いた中赤外レーザーが報告されている [16][17][18] 19,20) ．これにより，ブロードな吸収・発光スペクトルが得られ，波長可変レーザー材料として用いることができる．また Cr 2+ は四面体サイトに存在し，反転対称性がないことから，大きな誘導放出断面積と数 µs の短い上準位寿命を有することが特徴となる 21,22) ．Table 1 に，Cr 2+ 添加カルコゲン化物の基本的な光学特性をまとめた．いずれの材料も，吸収スペクトルと蛍光スペクトルは，それぞれ 1.5…”

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“…1.9 µm-Tm ファイバレーザーや 1.5 µm-Er ファイバレーザーが用いられる 16,25) ．先述の通り，Cr:ZnSe レーザーの最初の報告は 1996 年のことであるレーザー研究 2020 年 8 月…”

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Mid-Infrared Solid-State Laser Based on Cr 2+ Doped II-VI Chalcogenides

Yumoto

Saito

Wada³

2020

rle

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Cr 2+ doped II-VI chalcogenides (Cr:ZnSe, Cr:ZnS, Cr:CdSe, etc.) are attractive laser media for direct acstimulated-emission cross section. Using them as laser media allows us to obtain superb tunable laser and femtosecond laser capabilities in the mid-IR region. In this paper, we review the optical properties of Cr 2+ doped II-VI chalcogenides, pump sources, the recent progress of Cr 2+ doped II-VI chalcogenide lasers, and our mid-IR lasers based on Cr:ZnSe and Cr:CdSe.

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Self-starting mode-locked Cr:ZnS laser using single-walled carbon nanotubes with resonant absorption at 24 μm

Cited by 28 publications

References 25 publications

Ultrafast saturable absorption of large-diameter single-walled carbon nanotubes for passive mode locking in the mid-infrared

Ultrafast saturable absorption of large-diameter single-walled carbon nanotubes for passive mode locking in the mid-infrared

Facile preparation of air-stable n-type thermoelectric single-wall carbon nanotube films with anionic surfactants

Mid-Infrared Solid-State Laser Based on Cr 2+ Doped II-VI Chalcogenides

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