Hamamatsu-Photonics K.k.

Hisanari Takahashi

Takashi Inoue

Koyo Watanabe

Kyohei Shigematsu

Hiroshi Satozono

Hironori Takahashi

Naoya Matsumoto

Yoichi Kawada

Koji Takahashi

A dispersion measuring device includes a pulse forming unit, a light detection unit, a control unit, and an arithmetic operation unit. The control unit selectively outputs a first phase pattern and a second phase pattern. The pulse forming unit forms an optical pulse train from initial pulsed light, the optical pulse train including a plurality of optical pulses having a time difference from each other and having different center wavelengths from each other. The light detection unit detects a temporal waveform of the optical pulse train. The arithmetic operation unit estimates a wavelength dispersion amount of a measurement object based on a feature amount of the temporal waveform of the optical pulse train. When the first phase pattern is output, a pulse having a long center wavelength is generated first. When the second phase pattern is output, a pulse having a short center wavelength is generated first.

Dispersion measurement device and dispersion measurement method

A time response measurement apparatus includes a pulse formation unit, an attenuation unit, a waveform measurement unit, and an analysis unit. The pulse formation unit generates first pulsed light including a wavelength of pump light, second pulsed light including a wavelength of probe light, and third pulsed light including the wavelength of the pump light and the wavelength of the probe light, on a common optical axis. The attenuation unit transmits the first pulsed light, the second pulsed light, and the third pulsed light output from a sample arranged on the optical axis after being incident on the sample. An attenuation rate for the pump light is larger than an attenuation rate for the probe light. The analysis unit obtains a time response of the sample based on temporal waveforms of the first pulsed light, the second pulsed light, and the third pulsed light having passed through the attenuation unit.

Time response measurement apparatus and time response measurement method

An optical property measurement apparatus includes a pulse formation unit, a waveform measurement unit, and an optical system. The pulse formation unit is capable of changing a temporal waveform of pulsed light in accordance with a type of optical property to be measured. The waveform measurement unit measures a temporal waveform of the pulsed light output from a measurement object after being incident on the measurement object. The optical system has an attenuation unit with an attenuation rate with respect to one wavelength component constituting the pulsed light larger than an attenuation rate with respect to another wavelength component constituting the pulsed light. The optical system is capable of switching between a first state in which the attenuation unit is arranged on an optical path of the pulsed light output from the measurement object and a second state in which the attenuation unit is not arranged on the optical path.

Optical property measurement apparatus and optical property measurement method

A dispersion measurement apparatus includes a pulse forming unit, a correlation optical system, a beam splitter, an operation unit, an imaging unit, a spatial filter unit, and a photodetector. The pulse forming unit forms a light pulse train including light pulses having time differences and different center wavelengths. The beam splitter branches the light pulse train passed through a measurement object. The imaging unit disperses one light pulse train and images each light pulse. The spatial filter unit extracts light of a partial region of the other light pulse train. The correlation optical system outputs correlation light including a cross-correlation or an autocorrelation of the extracted light. The photodetector detects a temporal waveform of the correlation light. The operation unit estimates a wavelength dispersion amount in the measurement object based on a feature value of the temporal waveform.

Dispersion measurement apparatus and dispersion measurement method

Provided is a light shaping device including: an intensity modulation unit that modulates a spectrum intensity of an optical pulse that is input light, and outputs the optical pulse of which a temporal width is narrowed as output light. The intensity modulation unit modulates the spectrum intensity of the optical pulse with a mask expressed by a starting end wavelength from a central wavelength of the input light and a wavelength width.

Light shaping device and light shaping method

A wavelength conversion element includes a crystal having a periodically poled structure in which polarization is inverted with an inversion period &#x39b; along a z-axis which is an input axis of a light pulse. The wavelength conversion element is configured to generate an output the inversion period &#x39b;(x) at each position x by change of the inversion period &#x39b; according to the position x, and when a target frequency linearly changing with the position x is set to f(x)=b+ax, a frequency width of the output frequency is set to &#x3b4;f(x), and the output frequency is set to f(x)=f(x)+&#x3b1;(x), the output frequency is set to coincide with the target frequency within a range satisfying a condition |&#x3b1;(x)|&#x2264;&#x3b4;f(x).

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Hamamatsu, Japan

Hisanari Takahashi