Session Index

The study investigates the current gain (β) and optical light output between InGaP / GaAs light-emitting transistors (LETs) at different temperatures. From ambient temperature to 358K, the Darlington LET's current gain (β) improves 94.11％, which is desirable for the high resolution smart thermal sensor. Finally, we made the first optoelectrical amplifier in the world using LET.

 

We report the design and fabrication of a dielectric-grating waveguide driven by 40-keV electrons to emit narrow-line radiation at 0.56 THz. With a current density of 8 A/cm2, the coherent THz radiation builds up from bunched electrons in about 2 ns.

 

We generate and analyze random-modulated pulses based on the transient response of a gain-switched semiconductor laser and homodyne interference for pulsed lidar applications. Benefited by the low-correlated waveforms, lidars utilizing random-modulated pulses possess the advantages of no range ambiguity and immune to interference. With proper control of the laser drive current and the length of the homodyne delay, we successfully generate low-correlated random-modulated pulses suitable for the pulsed lidar applications. In compliance with the class-1 eye-safe regulation, 3D imaging with millimeter precision revealing the details of a hand is demonstrated.

  Preview abstract

Bound states in the continuum (BIC) have been attracted scientists to study intensive research due to its unique characteristics which are significant for both fundamental physics and practical applications. By using the mechanism of Friedrich-Wintgen BIC, we can realize the off-normal lasing with variable emission angles.

 

We demonstrate an on-chip heralded single photon source based on a type-II periodically poled lithium niobate (PPLN) spontaneous parametric down-converter (SPDC) and a 7-waveguide adiabatic coupler system, integrated in a Ti-diffused LiNbO3 waveguide platform. The PPLN SPDC generates cross-polarized photon pairs when pumped at 785 nm, while the adiabatic coupler system works both as a pump filter and a broadband polarizing mode splitter. The photon pair generation rate of such an integrated SPDC source is estimated to ~10^4 s^(-1) at a pump power of 4.5 uW.

 

Nonlinear pulse compression is used to generate 23 fs, 0.44 mJ ultrafast green pulses from an Yb:KGW solid state regenerative amplifier. By passing through an Ar-filled gas filled chamber, the original spectrum is broadened. Then, chirp mirrors are used to compensate the spectral phases.