Session Index

We employ the selectively pumped solid-state laser with the stimulated Raman scattering and second-harmonic generation to generate the frequency-doubled Hermite-Gaussian modes (FDHGMs) at 588nm. The FDHGMs are transformed by using an external cylindrical mode converter to generate various structured lights with multiple optical vortices. It is demonstrated that the number of vortices can be raised from 2 to 9 with increasing off-center displacements.

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We employ the selectively pumped solid-state laser with the stimulated Raman scattering and second-harmonic generation to generate the frequency-doubled Hermite-Gaussian modes (FDHGMs) at 588nm. The FDHGMs are transformed by using an external cylindrical mode converter to generate various structured lights with multiple optical vortices. It is demonstrated that the number of vortices can be raised from 2 to 9 with increasing off-center displacements.

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We employ an off-axis pumped Nd:YVO4 laser with stimulated Raman scattering and second harmonic generation to generate frequency-doubled Hermite-Gaussian modes at 589 nm. By using an astigmatic mode converter (AMC), the generated frequency-doubled Hermite-Gaussian modes are straightforwardly transformed into corresponding Hermite–Laguerre Gaussian modes with multiple vortices. Furthermore, we can control spatial distribution of the optical vortices by rotating the angle of the AMC.

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The two photon absorption (TPA) of ligand modified CsPbBr3 QDs film has been demonstrated from TPA PL measurement, which shows the quadratic depend on pump intensity. Through the z-scan measurement, the normalized transmittance reveals a symmetric dip with relative large TPA coefficient about 4.71×103 cm/GW than previous reports.

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The ultrathin perovskite paper enables the color-converted white-lighting of an 80-mW blue laser diode without severely compromising its encoding bandwidth to demonstrate a 10.8-Gbit/s 8-QAM-OFDM optical wireless data link over 0.3-m free-space after waveform pre-leveling.

 

The multimode vertical cavity surface emitting laser (MM-VCSEL) produced with 7.5 um oxide-confined aperture is performed for intra-data-center application. By employing bit loading discrete multi-tone (DMT) data streams, the data rate can boost up to 145 Gbit/s. When operating at 55oC, the degraded output power and encodable bandwidth of the MM-VCSEL under heating limits its maximal data rate to 130 Gbit/s.

 

Terahertz plays a pivotal part in numerous technology fields in modern times. In addition to light source and detector, THz application requires guiding devices such as lenses, waveguides, and reflectors. The absorptivity of the common 3D printer materials is larger than 5 cm-1 which does not match the requirement of high refractive index and low absorption rate producing lenses. In the study, it's found that the mixture of ABS powder and the rice husk ash (RHA) which is composed of SiO2 decreases the absorption rate effectively. Therefore, it is suitable for 3D printer materials on making a lens of THz.

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We demonstrated the optimization of blue diode-pumped Pr:YLF laser by varying mode overlap between pumping mode and cavity mode. When the pumping power was 1.2W, the output power and slope efficiency were achieved to 204.2mW and 34.1% respectively.

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We report a novel fast optical switch in a LiNbO3 photonic-circuit chip integrating an electro-optic (EO) polarization mode converter and a broadband adiabatic polarizing beam splitter. A high power-switching efficiency of ~95% can be obtained over a broad bandwidth of >100 nm (1520-1620 nm) via the temperature tuning with an EO switching voltage of ~20 V. Such a device can be of potential interest to quantum photonic manipulation when further integrated with a type-II spontaneous parametric down-conversion source.

 

In semiconductor heterostructures, such as GaN / AlGaN structures, there is a layer of two-dimensional electron gas (2DEG), which can be used as an electron source. The Electrons in two-dimensional electron gas can be attracted by an external electric field is transported to the receiver through a zero-potential track, and a series of current pulses generated by electron transmission are generated at the receiver.

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We explore the effects of cavity loss on the morphologies of Lissajous modes generated in a diode-end-pumped Nd:YVO4 laser by varying the cavity output transmittance. Experimental results show that Lissajous mode patterns gradually break into several segments with the growing cavity loss due to the photon decoherence. By further using theoretical resonant modes of the spherical cavity, the experimental observations are well reconstructed to give a quantitatively relation between the system dissipation and output transmittance for studying structured photon decoherence in the future.

 

This study investigates broad-band, high-entropy chaos generation using a semiconductor laser subject to intensity-modulated optical injection for true physical random bit generation. The proposed chaotic source can be used as a 2-bit true physical random bit generator at a rate of 160 Gb/s with guaranteed unpredictability.

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We theoretically explore the mechanism in a thulium Q-switched ytterbium-doped all-fiber fiber laser using a set of rate equations to model the correlations between the photons and the five energy levels of thulium involved in the Q-switching mechanism. We demonstrate that by coupling with a gain-switched resonator, the Q-switched laser is stabilized up to the maximum pulsing rate that is limited by the lifetime of level 3H5. To the best of our knowledge, this is the first study that revealed that level 3H5 plays an essential role in re-initialization, achieving sequential pulses and limiting the maximum repetition rate.