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Chin. Opt. Lett.
Research Highlights
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Design of double-zone aspheric diffractive intraocular lens with extended depth of focus

Heterogeneously integrating III-V materials on silicon photonic integrated circuits has emerged as a promising approach to make advanced laser sources for optical communication and sensing applications. Tunable semiconductor lasers operating in the 2–2.5 μm range are of great interest for industrial and medical applications since many gases (e.g., CO2, CO, CH4) and biomolecules (such as blood gluc...
Experimental demonstration of underwater optical wireless power transfer using a laser diode

We experimentally demonstrate an underwater optical wireless power transfer (OWPT) using a laser diode (LD) as a power transmitter. We investigate the characteristics of a solar cell and a photodiode (PD) as a power receiver. We optimize the LD, the PD, and the solar cell to achieve the maximum transfer efficiency. The maximum transfer efficiency of the back-to-back OWPT is measured as 4.3% with t...
Optical property measurements of 235 mm large-scale Ti:sapphire crystal

A Ti:sapphire crystal with a diameter of 235 mm and thickness of 72 mm was grown by the heat exchange method (HEM). The absorption intensity of the crystal at 532 nm averaged at 91%. The figures of merit (FOMs) at different positions of the crystal were measured and the FOM value in the central region was found to reach 90. The transmittance laser beam was intact with no obvious distortions and ha...
550 MHz carbon nanotube mode-locked femtosecond Cr:YAG laser

We demonstrate a femtosecond Cr:YAG laser mode-locked by a carbon nanotube saturable absorber mirror (CNT-SAM) at a repetition rate of 550 MHz. By employing the CNT-SAM, which exhibits a modulation depth of 0.51% and a saturation fluence of 28 μJ/cm2 at 1.5 μm, we achieved a compact bulk Cr:YAG laser with self-starting mode-locked operation near 1.5 μm, delivering an average output power of up to ...
Announcements
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COL Cover Story: Design of double-zone aspheric diffractive intraocular lens with extended depth of focus [13/09/2018]

The accommodation amplitude of the human eye usually decreases to less than 1 D after 50 years old, resulting in the inability of eyes to focus near object accurately. This dysfunction is called presbyopia, which makes it impossible ...
COL Cover Story: Experimental demonstration of underwater optical wireless power transfer using a laser diode [12/09/2018]

Recently, wireless power charging has attracted considerable attention and has been rapidly deployed in real-life applications. For example, underwater robots working for a long time, it could be efficient to charge the batteries wir...
Feature Issue Announcement : Extraordinary 2D Materials Based Nanophotonics [13/08/2018]

Submission Deadline:October 31, 2018   Chinese Optics Letters (COL) invites original manuscript submissions for a Feature Issue on Extraordinary 2D Materials Based Nanophotonics to be published in February 2019. Extraordin...
COL Cover Story: Optical property measurements of 235 mm large-scale Ti:Sapphire crystal [20/07/2018]

The emergence of ultra-intense and ultrashort lasersystem makes it possible to attain the extreme conditions in the laboratorylike ultrastrong electric field, ultrahigh magnetic field, ultrahigh energydensity, and gigantic light pres...
COL Cover Story:Carbon nanotube mode-locked Cr:YAG laser: High Efficient solution for high-repetition-rate femtosecond source near 1.5 μm [21/06/2018]

The femtosecond (fs) laser source with high average powers andhigh repetition rate (above500 MHz) is very attractive for the applicationslike nonlinear spectroscopyand material processing. The femtosecond lasersource with high pulse ...
Cover story: 50 GHz optical true time delay beamforming in hybrid optical/mm-wave access networks with multi-core optical fiber distribution [11/06/2018]

The tremendous growth of worldwidedata traffic over the past years means that the future access network architectures will be revised.The flexibility of wireless links, compared with wired ones, makes them moreadequate and cost effic...
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