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Laser Induced Breakdown Spectroscopy combined with a laser-ablation based depth profiling technique is demonstrated for the detection of copper contamination in transformer insulation. An increase in copper diffusion was found with ageing.
We demonstrated a frequency measurement of CW-THz wave referring to THz frequency comb. Effectiveness of the proposed method is demonstrated by measurement of sub-THz test sources. The achieved precision of frequency measurement was 2.0∗10−11.
We have grown Ce3+:LiCaAlF6 thin films by pulsed laser deposition. Cathodoluminescence showed two emission peaks which correspond to crystal, and photoluminescence of thin films had shorter decay time than that of crystal.
We investigated the geometry dependence of photo-conductive dipole antennas fabricated on the same low-temperature-grown GaAs substrate to clarify the effect of the antenna width and the excitation laser power.
A simple method for measuring timing-jitter in a gain-switched distributed-feedback laser using delayed optical feedback was proposed. Using this, the timing-jitter in a gain-switched pulse-train was estimated to be 26 ps without using high-speed equipment.
We observed THz radiation from the graphene-coated InP (100) surface and found the drastic change of the waveforms of THz radiation with time, which cannot be explained by the simple absorption of graphene.
We investigate surface recombination of photoexcited carriers at silicon surface by terahertz time-domain spectroscopy (THz-TDS). The surface is illuminated at 365 nm UV laser, and evaluates the surface recombination velocity (SRV). The values of SRV observed on silicon surface strongly reduce under illumination.
Laser terahertz emission microscopy was applied to investigate the SiGe film on the Si substrate. In this study, as the initial experiment to apply LTEM to non-destructive evaluation of the strained SiGe films, the THz emission properties of the strained-SiGe were measured.
We introduce a class of optical superlattices that are formed by two sets of wave vectors with single wave number but different azimuths. By a collimated light to illuminate a mask with multiple apertures, we generate nondiffracting superlattice beams.
Ultra-violet laser beam writing technique with 2-step voltage application was developed for formation of MgO:LiNbO3 domain-inverted structures. Domain-inverted gratings were fabricated and applied to waveguide quasi-phase-matched second-harmonic generation devices to demonstrate the effectiveness.
We construct a reliable actively Q-switched Nd:YVO4 laser to make a comparative study for the second harmonic generation between the extracavity and intracavity configurations under a similar operated condition. The output power at 266 nm as high as 1.67 W is effectually generated with the combination of the extracavity second and fourth harmonic generations under an incident pump power of 26 W at...
A dual-wavelength Q-switched laser by a cascaded electro-optic periodically poled lithium niobate crystal was reported. At 24 W diode power, we generated 320 and 100 μJ pulse energy at 1063 and 1342 nm, respectively.
The ultrafast spin and lattice dynamics in a multiferroics CuO were studied using polarization spectroscopy with the pump-probe technique. Terahertz damped oscillations in the circular birefringence and the relaxation in the linear birefringence were discussed.
Reference-free phase detection is demonstrated using advanced holographic diversity interferometry in which a virtual light source is locally produced from an object light passed through testing samples to simultaneously generate two phase-shifted interferograms.
We propose a method for extending thespace bandwidth in parallel phase-shifting digital holography using a commercially available polarization-imaging camera. The effectiveness of the proposed method was numerically and quantitatively verified.
We report a periodically poled lithium niobate crystal for both laser Q-switching and single-longitudinal-mode seeding generation in a Nd-laser system. Combing the volume Bragg grating, a wavelength tunable, pulsed single-longitudinal-mode laser source has been generated.
The extremely small angle speckle-suppressed partial random laser illuminating system with ∼0.1deg. divergence angle is realized. The speckle contrast of 8.5% in a 16 ms is reached. A 0.55 mW CW partial random laser is achieved.
A ring optical parametrical oscillator generating counterpropagating trains of picosecond pulses at the wavelength 1540 nm was realized. Operation stability of the system was investigated.
A novel heterogeneous integrated III-V/SOI single mode laser is proposed. Owing to the vernier effect between III-V Fabry-Perot resonator (FPR) and split silicon racetrack resonator (SSRR), single longitudinal mode can be obtained and selected by thermally tuned silicon waveguide.
We report about properties of multimode polymer 1×2 optical planar splitter. The splitters have the insertion loss around 6.96 dB for a structure comprising POF fibers and 4.38 dB (650 nm) with FG910LEC fibers.
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