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Chin. Opt. Lett.
Research Highlights
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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 ...
50 GHz optical true time delay beamforming in hybrid optical/mm-wave access networks with multi-core optical fiber distribution

We propose and experimentally validate an optical true time delay beamforming scheme with straightforwardintegration into hybrid optical/millimeter (mm)-wave access networks. In the proposed approach, the most complexfunctions, including the beamforming network, are implemented in a central office, reducing the complexityand cost of remote antenna units. Different cores in a multi-core fiber are u...
Photoacoustic characteristics of lipid-rich plaques under ultra-low temperature and formaldehyde treatment

Photoacoustic imaging (PAI) has been used to characterize the spatial and quantitative features of lipid-richatherosclerotic plaques with high sensitivity and specificity. In this Letter, we first validate that the ultra-lowtemperature and formaldehyde treatment have no effect on photoacoustic characteristics of the artery samples.Comparative experiments between the PAI and histological results de...
Announcements
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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...
Cover story: Photoacoustic characteristics of lipid-rich plaques under ultra-low temperature and formaldehyde treatment [20/03/2018]

Photoacoustic characteristics oflipid-rich plaques under ultra-low temperature and formaldehyde treatment Cardiovascular diseases are the number one cause of deathworldwide, amongwhich, atherosclerosis is the fundamental pathology. ...
Cover story: A robust fiber-based frequency synchronization system immune to strong temperature fluctuation [26/12/2017]

Square KilometreArray (SKA) is an international large-scale scientific engineering project thatinvolves multiple countries, aiming at building the largest and most sensitive radiotelescope in theworld. SKA will be constructed in the ...
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