Ushio Denki Kabushiki Kaisha

Towa Pharmaceutical Co., Ltd.

Aya Ota

Toshio Yokota

Koji Nakayama

Takuma Yokoyama

Go Yamada

Akihiko Nakano

Toshikazu Nagashima

Akira Ichihara

Aiko Sawada

Junki Sahara

A light source apparatus generates wavelength scanning light. A pulsed light source generates pulsed light including a continuous spectrum. An optical divider spatially divides the broadband pulsed light L into a plurality of n (n≥2) beams according to wavelengths. A plurality of n fibers give different delays to the n beams. The coupler multiplexes n beams output from the n fibers. In the light source apparatus, at least a part from an incident end of the optical divider to emission ends of the n fibers has a continuous waveguide structure. A light monitoring device extracts and measures part of light propagating through the continuous waveguide structure.

Light source apparatus

A new spectral measurement technique is provided which enables measurement even if the light to be measured exists for a very short period. In one embodiment, a broadband pulsed light wave whose wavelength shifts temporally and continuously in a pulse interferes with a light wave to be measured. The intensity at each wavelength of the light wave to be measured is obtained using a Fourier transform of the output signal from a detector that has detected the intensity of the wave resulting from the interference. A laser beam from a laser source is converted to a supercontinuum wave by a nonlinear optical element, and a pulse extension element extends pulses of the supercontinuum wave, thus generating the broadband pulsed light wave.

Spectral measurement method, spectral measurement system, and broadband pulsed light source unit

A nonlinear element provides a nonlinear effect to light output from a pulsed laser source. Remaining light component having the oscillation wavelength of the pulsed laser source is attenuated when the light is split by a dichroic mirror. The divided light is subjected to pulse stretching by a fiber, and is combined by a multiplexing element. The light thus combined is irradiated to a target object S. The light transmitted through the target object S is received by a photoreceiver. The output signal of the photoreceiver is converted by a calculation unit into a spectrum.

Broadband pulsed light source apparatus and spectroscopic measurement method

Super continuum light having a continuous spectrum over at least 1100 to 1300 nm is emitted from a pulsed light source, is pulse-stretched by a stretching element such that a relationship between a wavelength and an elapsed time in one pulse is one to one, and is radiated to a product. The light transmitted through the product is received by a light receiver, and output data is input to the determination unit. A quality determination program of the determination unit calculates an absorption spectrum from the output data, quantifies the absorption spectrum by chemometrics, and compares the absorption spectrum with a reference value to determine quality. The product determined to be a defective product is excluded by an exclusion mechanism.

Product inspection method and product inspection apparatus

A stretching fiber module that stretches a pulse width of the broadband pulsed light from a broadband pulsed light source such that a time and a wavelength in a pulse correspond to each other on a one-to-one basis includes a multicore fiber and single-core compensation fibers coupled to cores of the multicore fiber. The compensation fibers compensate for a variation in wavelength dispersion characteristic between the cores of the multicore fiber and are temperature-controlled by a temperature adjuster.

Broadband pulsed light source apparatus, spectroscopic measurement apparatus, and spectroscopic measurement method

An ultrashort light pulse oscillated from an ultrashort pulse oscillator enters a waveguide () via a polarization control element (). After conversion into a supercontinuum by a nonlinear optical effect, it is compressed by a prism pair compressor () as pulse compressor (), and then emitted. The waveguide (), which is a nonlinear fiber with normal dispersion in the wavelength range from 850 to 1550, generates the supercontinuum having a spectrum continuous in a wavelength band width of at least 200 nm included in the wavelength range from 850 to 1550 nm. The supercontinuum, which has a peak power within 1 to 100 kW, can be used as excitation light in a multiphoton excitation fluorescence microscope for fluorescence observation of biological samples.

Supercontinuum source, method for generating and emitting a supercontinuum, multiphoton excitation fluorescence microscope, and multiphoton excitation method

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Tokyo, Japan

Aya Ota