Applied Physics Express

Journal Information
ISSN / EISSN : 1882-0778 / 1882-0786
Published by: IOP Publishing (10.35848)
Total articles ≅ 5,742
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Xianchao Guan, Changsheng Yang, Quan Gu, Wei Lin, Tianyi Tan, Qilai Zhao, , Zhongmin Yang, Shanhui Xu
Published: 21 October 2021
Applied Physics Express, Volume 14; https://doi.org/10.35848/1882-0786/ac2e9b

Abstract:
Based on a three-cascaded all-fiber master-oscillator power-amplifier configuration, a 1950-nm high-brightness narrow-linewidth linearly-polarized single-frequency fiber laser with an output power of 316 W and a laser linewidth of 8.4 kHz is demonstrated experimentally. With the employment of a round-square-coiling fiber scheme and a 20/300-μm-core/cladding polarization-maintaining Tm3+-doped double-cladding fiber, the bending loss of LP11 mode is improved, thus leading the good beam quality, Mx2=1.19 and My2=1.17, herein. Additionally, a polarization-extinction ratio of 17.1 dB and an optical signal-to-noise ratio of >63 dB separately confirm good maintenance of linear polarization and adequate suppression of amplified spontaneous emission in the power amplification
Denis Mishin, Daniil Provorchenko, Dmitry Tregubov, Nikolai Kolachevsky,
Published: 20 October 2021
Abstract:
We discuss extension of a recently proposed method based on continuous spectroscopy of 88Sr atoms trapped into a moving optical lattice [Appl. Phys. Express,14(7),072006(2021)] to operation of bicolor thulium optical clocks. Simultaneous interrogation of two clock transitions at 1.14μm and building up a synthetic frequency provides a straightforward way to significantly suppress the first-order Doppler shift and cancel out the second-order Zeeman shift, the latter being one of the major uncertainty sources in the originally proposed 88Sr setup. In our configuration, the total systematic frequency shift is 4×10−16 and instability at or lower than 10−18 after 1 hour of integration.
, Akira Takahashi, Makoto Miyoshi, Takashi Egawa
Published: 19 October 2021
Abstract:
Transfer-free graphene synthesis was performed using the catalyst metal agglomeration technique. X-ray diffraction and electron backscattering diffraction measurements indicated that the quality of the Ni catalyst film was enhanced with the increase of the crystallite size of Ni (111) by heating treatments during and following Ni deposition. Moreover, Raman scattering measurements revealed that the graphene film synthesized using heating treatments for the Ni film had better structural qualities. We measured the maximum field-effect mobilities to be 1540 cm2/(V⸱s) for electrons and 1600 cm2/(V⸱s) for holes, which was approximately twice as large as those fabricated without the heating treatments.
, Yuanqi Song, Li Yan, Qimeng Lin, , Xiaoqiang Feng, Jintao Bai
Published: 18 October 2021
Abstract:
We demonstrate an ultrashort pulsed Yb-doped polarization-maintaining fiber laser which uses Gires–Tournois interferometers (GTI) for managing dispersion. The GTI placed in the oscillator cavity aims to compress the pulse. Resulting in a pulse with a duration of 78 fs. The fact that the laser does not require additional de-chirp makes it more compact and avoids the insertion loss of additional components. Experiments with different dispersion confirm the excellent dispersion-managed performance of GTI. As far as we know, the duration of 78 fs is the shortest pulse obtained by using intracavity GTI dispersion management in fiber lasers.
Ting Zhang, Ke Wang, Fei Gao, He Liu, Xin Zhang, Gang Cao, Ting Wang, Jian-Jun Zhang, Hai-Ou Li, Guo-Ping Guo
Published: 15 October 2021
Abstract:
Ge quantum dots are emerging as an attractive platform to realize high-fidelity qubits because of their strong spin-orbit interaction (SOI) and weak hyperfine interaction (HFI). Here, we measure and analyze the transport spectra on a highly tunable double quantum dot (DQD) defined in Ge hut wires with an external out-of-plane magnetic field. At high magnetic field, the SOI induced spin-flip tunneling lifts the Pauli spin blockade (PSB) and maps out the energy spectrum of DQD. At low magnetic field, the HFI mixes the (1,1) states and leads to an enhanced leakage current, which is affected by the inter-dot tunnel coupling.
Ruixiao Li, Shanting Hu, Xiaodong Gu, Fumio Koyama
Published: 14 October 2021
Abstract:
A solid-state beam scanner is key element for next-generation 3D sensing. To overcome problems of current solid-state beam scanners, such as limited resolutions and difficulties in manufacturing, we previously invented a vertical-cavity-surface-emitting-laser (VCSEL) beam scanner based on a VCSEL waveguide/amplifier. In this paper, we proposed and demonstrated an electrical beam scanning module by integrating a surface grating VCSEL to the VCSEL scanner and by assisting with diffractive optical element and prism mirror for ultra-large field of view. We realized continuous fan beam scanning with record field of view of >100° and resolution points number of 1400.
, Christoph Sürgers, Wulf Wulfhekel
Published: 13 October 2021
Applied Physics Express, Volume 14; https://doi.org/10.35848/1882-0786/ac2a56

Abstract:
The electronic structure and the domain wall width of industrial (Nd,Dy)2Fe14B hard magnets were investigated using low-temperature, spin-polarized scanning tunneling microscopy (STM) in ultra-high vacuum. In a first step, atomically clean and flat surfaces were prepared. The flat terraces are separated by monatomic steps. Surface termination was identified as the Fe c layer from atomically resolved STM imaging. The electronic density of states and its spin polarization agree well with ab initio predictions of the Fe c layer. High resolution spin-polarized STM images allowed to finally resolve the domain wall width Wm of only 3.2 ± 0.4 nm.
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