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Continuously tuning of the phase-difference and separation of bound solitons have been realized from a passively mode-locked fiber laser using a carbon nanotube modelocker through intracavity gain/loss tuning.
The vertical cavity surface emitting laser diode (VCSEL) was fabricated using nonpolar GaN substrates. The direction of the polarization of the lasing was along a-axis. The emission wavelength was 412nm and the threshold current was 80mA using 10 μm aperture. The selective etching was used to make a short cavity of the VCSELS.
We review continuous-wave (CW) and pulsed yellow-orange lasers formed of a self-Raman crystal and an intracavity frequency-doubling crystal. Maximum CW and pulsed yellow-orange outputs of 140 mW and 264mW were observed, respectively. We also address thermal management to overcome the severe thermal loading in the self-Raman laser crystals.
Two fields for laser projection have attended big interest since several years due to the potential of high volume markets. One is the mobile projection; ideally a projection unit embedded in a mobile phone. For customer acceptance a reasonable price and high brightness of such a device are crucial. Mobile pico projectors need a brightness of 15 to 20 lumens. While red and blue laser with sufficient...
Magneto optical imaging of small magnetic fields High resolution imaging small magnetic fields is useful in a number of fields ranging from material to medical sciences. While sensitive detection of magnetic fields has been achieved with SQUIDS or atom vapor magnetometers, sensitive imaging with high sensitivity has remained elusive so far. Using magneto-optically active systems — especially the nitrogen-vacancy...
Various medical applications using terahertz technology are presented. Examples include the dynamic imaging of skin drug absorption, the diagnostic imaging of cancers such as brain tumors and oral melanoma, and the analysis of blood substances.
Mitsubishi Electric Corporation developed and launched the commercial production of the laser backlight liquid crystal television set Real LaserVue model LCD-55LSR3 in June, 2012. The backlight of this television employs two kinds of light source. One is red laser and the other is cyan LED. Recently, white LEDs have been the mainstream as the light sources for liquid crystal television sets. Because...
Nanowires offer new opportunities for nanoscale quantum optics; the quantum dot geometry in semiconducting nanowires as well as the material composition and environment can beengineered with unprecedented freedom to improve the light extraction efficiency. By doping a nanowire and making ohmic contacts on both sides, a nanowire light emitting diode can be obtained with a single quantum dot as the...
Diffraction-unlimited semiconductor nanolasers are demonstrated by using single shape-controlled InGaN/GaN core-shell nanorods as laser gain media on Ag films epitaxially grown on Si substrates. The use of atomically smooth Ag films allows us to fabricate low-loss plasmonic cavities for ultralow-threshold, continuous-wave (CW) nanolaser operation above liquid nitrogen temperature. Furthermore, the...
We measured the membrane roughness of neuroblastoma cells by non-interferometric wide-field optical profilometry. We found that the peptide related to Alzheimer's disease, Amyloid-beta 42, reduces membrane roughness, but direct-current electrical fields recover this effect.
We developed GPU(Graphics Processing Unit) processing to display correlation mapping OCT images in real-time. A display rate of 91 frames per second for processed images (1024 FFT size × 512 lateral A-scans) was achieved.
Based on pump-probe technique (PPT), we observed stimulated Brillouin scattering (SBS) in a 100-m-long silica graded-index multimode optical fiber with the same core diameter as that of a perfluorinated graded-index polymer optical fiber (PFGI-POF) (= 50 μιη). The SBS threshold was measured to be −50 mW, which was much lower than 5.08 W, the SBS threshold obtained for the same fiber without PPT. This...
A non-mechanical axial scanning laser Doppler velocimeter (LDV) with directional discrimination using a single transmission path is proposed. The axial scan and directional discrimination has been demonstrated experimentally using a sensor probe setup.
We proposed wavelength-scanning surface plasmon microscopy for the application of micro/nanobubble detection. We demonstrated that the bubble layer's position localized at a substrate's surface could theoretically be identified in a vertical direction.
A laser-induced repetitively operated fast neutron source was developed by using a deuterated polystyrene film target and a femtosecond laser with a peak output power of approximately 24 TW and was applied for laser activation analyses of indium and gold samples. By using a home-made gated scintillation detector, the developed neutron source was estimated to have a neutron yield of approximately 4...
We numerically study the dynamics of supercontinuum generation for four types of conventional fiber laser pulses. Our results show that in anomalous dispersion pumping regimes a dechirped parabolic pulse generates the broadest output spectrum.
A new algorithm is proposed to accurately reconstruct the spectral phase from frequency-resolved optical gating (FROG) traces seriously distorted by crystal dispersion and rippled phase-matching spectrum for the fist time (to our best knowledge).
By introducing the symmetry-breaking in geometry, we reveal the existence of thresholdless crescent waves, i.e., nonlinear surface modes pinged to the boundary of a curvature, in an elliptical ring. An effective nonlinear Schrödinger equation along the azimuthal direction is derived by taking the transformation in the curvilinear coordinate of elliptical symmetry, which illustrates the formation of...
We present a simple technique for obtaining a broad and flat Brillouin gain spectrum (BGS) in optical fibers. By modulating the driving current of a pump laser diode with triangular waveform, a BGS with lower than 0.3 dB gain variation over > 200 MHz is achieved, which is, to the best of our knowledge, the flattest BGS ever reported. With this technique, the bandwidth of the flattened BGS can be...
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