Contents
2017
Volume: 15 Issue 1
22 Article(s)

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Research Articles
Fiber Optics and Optical Communications
Investigation of clustering effects on erbium-doped fiber laser performance
Md. Ziaul Amin, and Khurram Karim Qureshi
To design a compact erbium-doped fiber laser, a high-concentration erbium-doped fiber (EDF) is needed. However, increasing the erbium ion (Er3+) concentration can reduce the EDF performance via the Er3+-Er3+ interaction. In this Letter, we investigate the Er3+-Er3+ interaction effect by designing a tunable erbium-doped fiber-ring laser (EDFRL). This is the first time (to the best of our knowledge) that someone has considered different numbers of ions per cluster and simulated the EDFRL output power degradation due to ion–ion interaction. If the number of ions in the cluster is increased, the lasing output power will decrease accordingly. The most dominant effect is seen in the 1530 nm wavelength region, where the EDF shows a higher signal absorption compared to the other wavelength region. Moreover, a comparison has been done for lasing performance analysis with different dopant ion concentrations. The comparison results show that a higher dopant concentration is advantageous for longer-wavelength lasing.
Chinese Optics Letters
  • Publication Date: Jan. 10, 2017
  • Vol. 15, Issue 1, 010601 (2017)
Imaging Systems
Flat mirror for millimeter-wave and terahertz imaging systems using an inexpensive metasurface
Gil Litmanovitch, David Rrotshild, and Amir Abramovich
Chinese Optics Letters
  • Publication Date: Jan. 10, 2017
  • Vol. 15, Issue 1, 011101 (2017)
Lasers and Laser Optics
Watt-level high-power passively Q-switched laser based on a black phosphorus solution saturable absorber
Xi Wang, Zhenfu Wang, Yonggang Wang, Lu Li, Guowen Yang, and Jinping Li
Chinese Optics Letters
  • Publication Date: Jan. 10, 2017
  • Vol. 15, Issue 1, 011402 (2017)
Stable dual-wavelength erbium-doped fiber laser using novel fabricated side-polished arc-shaped fiber with deposited ZnO nanoparticles
H. Ahmad, I. S. Amiri, A. Z. Zulkifli, H. Hassan, R. Safaei, and K. Thambiratnam
A dual-wavelength fiber laser operating at the 1550 nm region using a side-polished arc-shaped fiber with deposited ZnO nanoparticles is proposed and demonstrated. The arc-polished fiber is fabricated by using a simple but novel approach in which a silicon carbide paper polishes one side of a conventional single-mode fiber. An arc-polished fiber with a length of 2.25 mm and an insertion loss of 0.95 dB is obtained and deposited with ZnO nanoparticles by the drop-cast method. A stable dual-wavelength output is obtained at 1562.5 and 1563.4 nm at peak powers of 9.3 and 10.1 dBm, respectively, as well as a signal-to-noise ratio of 28.4 dB and a channel spacing of 0.9 nm. Both lasing wavelengths also have narrow linewidths of between 0.045 and 0.049 nm and show little to no wavelength or power fluctuations over continued testing.
Chinese Optics Letters
  • Publication Date: Jan. 10, 2017
  • Vol. 15, Issue 1, 011403 (2017)
Beat note analysis and spectral modulation of terahertz quantum cascade lasers with radio frequency injection
Yonghao Zhu, Hua Li, Wenjian Wan, Li Gu, Tao Zhou, Stefano Barbieri, and Juncheng Cao
We demonstrate the electrical beat note analysis and radio frequency (RF) injection locking of a continuous wave (cw) terahertz quantum cascade laser (QCL) emitting around 3 THz (~100 μm). In free running the beat note frequency of the QCL shows a shift of ~180 MHz with increasing drive current. The beat note, modulation response, injection pulling, and terahertz emission spectral characteristics in the different current regimes I, II, and III are investigated. The results show that in the current regime I close to the laser threshold we obtain a narrower beat note and flat response to the RF modulation at the cavity round trip frequency. The pulling effect and spectral modulation measurements verify that in the current regime I the RF injection locking is more efficient and a robust tool to modulate the mode number and mode frequency of terahertz QCLs.
Chinese Optics Letters
  • Publication Date: Jan. 10, 2017
  • Vol. 15, Issue 1, 011404 (2017)
Materials
Pure red visible emission via three-photon excitation of colloidal Na3ZrF7:Er nanoparticles using a telecom-band laser
Shuai Ye, Guangsheng Wang, Maozhen Xiong, Jun Song, Junle Qu, and Weixin Xie
Chinese Optics Letters
  • Publication Date: Jan. 10, 2017
  • Vol. 15, Issue 1, 011601 (2017)
Research Articles
Editorial for focus issue on microwave photonics
José Capmany, Jianping Yao, Wei Li, and Pan Shilong
Chinese Optics Letters
  • Publication Date: Jan. 10, 2017
  • Vol. 15, Issue 1, 010001 (2017)
Scattering
Static light scattering properties of a ZnO nanosphere aqueous suspension at visible and near-infrared wavelengths
Haopeng Wu, Jiulin Shi, Feng Yan, Junjie Yang, Yubao Zhang, and Xingdao He
The scattering properties of ZnO nanospheres with four different particle diameters of 10, 50, 100, and 200 nm suspended in water are investigated theoretical and experimentally in the spectral range of the entire visible range and part of the near-infrared region. The scattering properties of ZnO nanospheres suspended in water are described by employing three main parameters: the angular distribution of the scattering intensity I, the scattering extinction coefficient αscat, and the scattering cross section σscat. The results indicate that (i) at a certain wavelength, the angular distribution of the scattering intensity appears as an obviously forward-propagating feature, and the forward-scattering intensity is dominant gradually when the particle diameter increases from 10 to 200 nm, and (ii) the scattering extinction coefficient and cross section can be determined by using the measured transmittance changes of a pure water sample and a given ZnO sample; they all are shown to be dependent on the particle size and incident wavelength. The experimental results of four different scattering samples agree well with the theoretical predictions within the given wavelength range.
Chinese Optics Letters
  • Publication Date: Jan. 10, 2017
  • Vol. 15, Issue 1, 012901 (2017)