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We will present a futher understanding of the threshold transition in lasers operating at nanoscale, by measuring the threshold transition from a quantum, statistical and dynamical points of view at room temperature and telecommunication wavelengths.
Dielectric-loaded surface plasmon-polariton nanowaveguides on the gold film are fabricated by two-photon polymerization with femtosecond laser pulses. The leakage radiation microscopy shows that they are single-mode with strong mode confinement at 830 nm.
Single InAs semiconductor quantum dots were coupled to a microcavity consisting of a semiconductor Bragg reflector below the quantum dot layer, and an external micromirror fabricated at the tip of a single mode fiber.
We present the latest results on high-power extreme-ultraviolet (EUV) light sources for lithography. This includes operation of high-power pulsed CO2 lasers, high repetition-rate Sn droplet targets, and collection of EUV light using multilayer-coated optics.
We present a mid-infrared frequency comb generated via differency frequency mixing of a Yb femtosecond fiber laser. After passing through a methane gas sample, the MIR comb is upconverted and dispersed onto a CCD for detection.
A monolithically integrated dual wavelength semiconductor laser for optical heterodyning is presented. We present a novel laser design which employs surface etched DBR gratings in order to obtain lasing at very narrow line widths.
We demonstrated a flexible photonic crystal defect laser on a polydimethylsiloxane (PDMS) polymer substrate. The curvature dependences of lasing power and threshold were also characterized by bending the photonic crystal cavity at different bending curvatures.
We propose a square photonic crystal point-shifted nanocavity, which sustains an ultra-small lowest-order whispering-gallery mode. Lasing actions with low threshold of 160 μW and changed polarization due to a nearby nano-particle are observed.
The travelling-wave method was used to investigate nonlinear spatio-temporal dynamics of a tunable laser under both weak and strong external optical injection. The results suggest effective methods of controlling laser dynamics in network applications.
All-epitaxial oxide-free vertical-cavity surface-emitting lasers (VCSELs) are demonstrated. 4-µm-diameter VCSEL is shown with threshold current of 350 µA, slope efficiency of 0.77 W/A, wall-plug efficiency of 21% and output power of 6.3 mW.
The sensitivity of laser-interferometric gravitational wave detectors can be improved with squeezed light. The first squeezed-light laser aiming for a permanent operation in such a detector has now been accomplished and characterized.
A novel edge-emitting Bragg reflection waveguide laser with a low index core is demonstrated. Single transverse mode operation is observed with typical thresholds below 250 A/cm2 and propagation losses of 11.4 cm−1.
Time-resolved picosecond pure-rotational coherent anti-Stokes Raman spectroscopy is demonstrated for thermometry and species concentration determination in flames. Time-delaying the probe pulse enables successful suppression of unwanted signals. A theoretical model is under development.
A novel method for selectively exciting a single-spatial-mode (fundamental or higher-order) in a high-power multi-mode fiber laser resonator is presented. Preliminary results for a cladding-pumped Tm-doped silica fiber laser are discussed.
A double pass cw-pumped Ti:sapphire amplifier delivering 1.6μJ pulses at 1 MHz is presented. Furthermore a simple analytical model for the amplifier is deduced and concepts for further energy scaling are explored.
We discuss the regime where nano-ring laser is feasible in which the absorption loss in metal is compensated by semiconductor gain. A nanometre-scale electrically pumped ring laser design is simulated using multi-level multi-electron FDTD model.
In this new architecture of extended cavity diode laser, broadband tunability is provided by an acousto-optical tunable filter with a longitudinal interaction. The laser offers single mode operation, >100 nm accordability, and two-wavelength operation capability.
We report a novel tuning mechanism based on a “wire-laser” with subwavelength transverse dimensions(w≪λ). By manipulating the waveguided mode propagating outside the cavity, frequency tuning of ∼137GHz (3.6%) is demonstrated from a single-laser device at ∼3.8THz.
We demonstrate spatio-temporal control of local plasmon on Au nano-rods with different aspect ratios irradiated by pulse shaped femtosecond laser. This technique could form a novel nano-scale reaction field.
We theoretically investigate and demonstrate a two-color scheme mixed by an infrared and fundamental (800 nm) laser pulses to enhance the harmonic yield and soften the wavelength dependence.
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