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A gauge block evaluation system was developed and its uncertainty estimation was performed for distance determination using the repetition interval of a femtosecond optical frequency comb — the national standard tool for measuring length in Japan.
The effectiveness of phase noise suppression by incoherent addition for a passive mode-locked fiber laser system is investigated. Results are presented and compared for two different types of interferometers and different background phase noise levels.
Optical fibre Bragg gratings were fabricated in 3 different fibres, and their spectra at 3 harmonics were measured and cross-compared with images of their internal complex refractive index profiles obtained via differential interface contrast imaging.
We analyze the interaction of arbitrary quantum states of light with a single atom in free space using a local interaction with a single mode and a discrete model of light field propagation.
The effect of absorption inhomogeneity on μs estimation of a scattering medium with a newly proposed technique was investigated. The estimation error was significantly reduced from that with a conventional technique.
We demonstrated high luminance of blue organic light-emitting devices using DNA biopolymer modified by aromatic surfactant. Such material helps to improve hole-electron balance at the emitting layer without increasing the driving voltage significantly, which is attributed to the use of aromatic surfactant in DNA biopolymer. Maximum luminance of 12014 cd/m2 at 14V for DNA biopolymer-based OLED was...
Quantum Physics imposes that any phase independent amplification introduces excess noise. Nevertheless this limitation could be ignored with conditioning. We report fully characterization with homodyne tomography of a non-deterministic noiseless amplification of a coherent state.
We add selective two-photo excitation (TPE) function for simultaneous spatial and temporal focusing using a femtosecond laser pulse shaper. Axial TPE resolution of 15 μm and linear axial scanning capability is achieved.
We demonstrate an ultracompact and robust micro Sagnac loop interferometer by splicing the end-sphered hollow-core fiber against single mode fiber. The device length is less than 450 μm and the extinction ratio can be above 29dB.
Monolithic integration of a micromechanical cantilever with an optical ring resonator in silicon on insulator is demonstrated. The ring is tuned over a 120 pm wavelength range by applying 9 V, without affecting its Q-factor.
We measured Raman spectra of extracted human teeth using an integrated arrayed-waveguide-grating spectrometer fabricated in silicon-oxynitride technology. The results represent a step towards the realization of compact, hand-held, integrated spectrometers for the detection of early dental caries.
We study optical wave turbulence in Raman fibre lasers using particular examples of 13 km and 22 km long Fabry-Perot resonators. We demonstrate that the sign of the cavity dispersion has a critical impact on the spectral and temporal properties of generated radiation that are directly relevant to the fibre laser performance. For a normal dispersion, we observe in numerical modelling an intermediate...
Real-time THz color scanner was proposed based on two-dimensional spatio-temporal THz imaging. The proposed system has the potential to expand the application scope of THz spectral imaging based on its rapid image acquisition rate.
Experimental results and related arrangements are reported from application of the TRIDENT laser with pulses of 250TW power and about 500fs duration interacting with targets with cluster loading at extremely high contrast ratio.
Selection in various families of axi-symmetric modes (Laguerre-Gaussian, cylindrical vector and Bessel-like modes with near-diffraction free propagation properties) in an Yb:YAG ceramic laser by manipulating the cavity stability conditions of a lens resonator is reported.
Relative intensity noise of a quantum cascade laser under optical feedback was first evaluated. Noise smaller than that of a conventional laser diode was due to a small line enhancement factor and long cavity length.
We demonstrate a novel bidirectional fiber laser mode-locked with two semiconductor saturable absorber mirrors (SESAMs) incorporated into the laser cavity through a four-port circulator. The laser allows the generation of two independent countercirculating mode-locked pulse trains, each with individual fundamental repetition. In the experiment, two countercirculating pulse trains, with repetition...
Frequency tunable microwave signal generation, based on a dual-wavelength single-longitudinal-mode (SLM) erbium-doped fiber (EDF) laser, incorporating a phase-shifted fiber Bragg grating (PS-FBG) with two Ji-phase shifts, is achieved.
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