Abstract: There is provided a measurement apparatus including a light source unit configured to emit pulsed laser light used for pump light and Stokes light that excite predetermined molecular vibration of a measurement sample and for probe light that is intensity-modulated with a predetermined reference frequency and that has a same wavelength as the pump light or the Stokes light, a pulse control unit configured to cause time delay of the probe light generated by the light source unit and then to guide the pump light, the Stokes light, and the time-delayed probe light to the measurement sample, and a detection unit configured to detect transmitted light transmitted through the measurement sample or reflected light from the measurement sample. A relaxation time of the molecular vibration of the measurement sample is measured using time-resolved stimulated Raman gain spectroscopic measurement or time-resolved stimulated Raman loss spectroscopic measurement of the measurement sample.

Abstract: Provided is a measuring apparatus including: a light source unit to emit pulsed laser light used for pump light and Stokes light that excite a molecular vibration of a sample; a Stokes light generating unit to modulate an intensity of the pulsed laser light and to generate Stokes light using the pulsed laser light having the modulated intensity; a time delaying unit to delay the pump light using the pulsed laser light or the Stokes light; a detecting unit to detect, by lock-in detection, light transmitted through the sample irradiated with the pump light and the Stokes light having a controlled time delay amount, or reflected light from the sample; and an arithmetic processing device to perform arithmetic processing on the basis of anti-Stokes light detected by the lock-in detection while controlling the intensity modulation and the time delay amount.

Abstract: Provided is a fundus imaging apparatus including a wavefront adjuster and a detector. The wavefront adjuster is configured to adjust a wavefront of a femtosecond pulsed laser beam incident on an ocular fundus to be examined. The detector is configured to detect fluorescence generated in a multi-photon excitation process by the femtosecond pulsed laser beam incident on the ocular fundus to be examined. The wavefront adjuster is further configured to adjust the wavefront so that an intensity of the fluorescence to be detected by the detector becomes a maximum value.

Abstract: A non-linear Raman spectroscopy apparatus includes a light source unit emitting a pulse beam having a pulse width of 0.2 ns to 10 ns, a pulse peak power of 50 W to 5000 W, and a wavelength of 500 nm to 1200 nm, and a single-mode fiber through which continuous white light is generated from the pulse beam. A test sample to be measured is radiated with a pump-cum-probe beam formed of the pulse beam and a Stokes beam formed of the continuous white light to obtain a Raman spectrum.

Abstract: There is provided a measurement apparatus including a light source unit configured to emit pulsed laser light used for pump light and Stokes light that excite predetermined molecular vibration of a measurement sample and for probe light that is intensity-modulated with a predetermined reference frequency and that has a same wavelength as the pump light or the Stokes light, a pulse control unit configured to cause time delay of the probe light generated by the light source unit and then to guide the pump light, the Stokes light, and the time-delayed probe light to the measurement sample, and a detection unit configured to detect transmitted light transmitted through the measurement sample or reflected light from the measurement sample. A relaxation time of the molecular vibration of the measurement sample is measured using time-resolved stimulated Raman gain spectroscopic measurement or time-resolved stimulated Raman loss spectroscopic measurement of the measurement sample.

Abstract: A fluorescence image acquisition method including: irradiating an eyeground with a short-pulse beam of light for exciting a fluorescent dye; setting the time point of emission of the light as a reference, measuring the intensities of luminescence of the fluorescent dye at two different times which are predetermined periods of time after the reference, determining the ratio between the intensities of luminescence at the two different times, and detecting the intensity of luminescence of the fluorescent dye having marked a target by using the ratio; and generating a fluorescence image of the fluorescent dye having marked the target, based on the results of detection by the detecting step.

Abstract: Provided is a nonlinear Raman spectroscopic apparatus includes two light sources and a pulse control section. The two light sources are each configured to emit short-pulse laser light. The pulse control section is configured to time-delay the short-pulse laser light emitted from one of the light sources.

Abstract: A non-linear Raman spectroscopy apparatus includes a light source unit emitting a pulse beam having a pulse width of 0.2 ns to 10 ns, a pulse peak power of 50 W to 5000 W, and a wavelength of 500 nm to 1200 nm, and a single-mode fiber through which continuous white light is generated from the pulse beam. A test sample to be measured is radiated with a pump-cum-probe beam formed of the pulse beam and a Stokes beam formed of the continuous white light to obtain a Raman spectrum.

Abstract: Provided is a fundus imaging apparatus including a wavefront adjuster and a detector. The wavefront adjuster is configured to adjust a wavefront of a femtosecond pulsed laser beam incident on an ocular fundus to be examined. The detector is configured to detect fluorescence generated in a multi-photon excitation process by the femtosecond pulsed laser beam incident on the ocular fundus to be examined. The wavefront adjuster is further configured to adjust the wavefront so that an intensity of the fluorescence to be detected by the detector becomes a maximum value.

Abstract: An optical disc apparatus can highly accurately record a hologram representing information on or reproduce such a hologram from an optical disc. When recording information on an optical disc 100, the optical disc apparatus controls the position of an objective lens OL1 according to the outcome of detection of a red reflected light beam Lr2 so as to make the focus Fr thereof follow a target track and it also makes the focus Fb1 of a blue light beam Lb1 agree with a target mark position by the objective lens OL1 and also the focus Fb2 agree with the target mark position by controlling the position of another objective lens OL2 according to the outcome of detection of the blue light beam Lb1 by way of the objective lenses OL1 and OL2 so as to make the focus Fb1 of the blue light beam Lb1 and the focus Fb2 of the blue light beam Lb2 agree with the target mark position and the blue light beam Lb1 and the blue light beam Lb2 interfere with each other.

Abstract: A terahertz spectroscopic apparatus includes a polarization beam splitter transmitting or reflecting a linearly polarized terahertz wave, a quarter wave plate imparting a phase difference of 90° to a terahertz wave impinging thereon, and an optical member guiding a circularly polarized terahertz wave impinging thereon from the polarization beam splitter via the quarter wave plate to an irradiation surface.

Abstract: A spectral data analyzer is disclosed. The spectral data analyzer calculates the spectral intensity ratio of a C—H band and an amide I band in a Raman spectrum that corresponds to a substance present in a body tissue; and automatically determines the presence or absence of amyloid beta in the substance based on the calculated ratio.

Abstract: A fluorescence image acquisition method including: irradiating an eyeground with a short-pulse beam of light for exciting a fluorescent dye; setting the time point of emission of the light as a reference, measuring the intensities of luminescence of the fluorescent dye at two different times which are predetermined periods of time after the reference, determining the ratio between the intensities of luminescence at the two different times, and detecting the intensity of luminescence of the fluorescent dye having marked a target by using the ratio; and generating a fluorescence image of the fluorescent dye having marked the target, based on the results of detection by the detecting step.

Abstract: An optical disc apparatus can highly accurately record a hologram representing information on or reproduce such a hologram from an optical disc. When recording information on an optical disc 100, the optical disc apparatus controls the position of an objective lens OL1 according to the outcome of detection of a red reflected light beam Lr2 so as to make the focus Fr thereof follow a target track and it also makes the focus Fb1 of a blue light beam Lb1 agree with a target mark position by the objective lens OL1 and also the focus Fb2 agree with the target mark position by controlling the position of another objective lens OL2 according to the outcome of detection of the blue light beam Lb1 by way of the objective lenses OL1 and OL2 so as to make the focus Fb1 of the blue light beam Lb1 and the focus Fb2 of the blue light beam Lb2 agree with the target mark position and the blue light beam Lb1 and the blue light beam Lb2 interfere with each other.

Abstract: A method of measuring a terahertz wave includes the steps of: starting input of a pulse signal showing that scale marks have been detected, which are arranged at equal intervals along a moving direction of a movable stage which can move in a direction in which an optical path length of incident pulse light is contracted or extended; and taking signals outputted at pulse intervals of the pulse light from a terahertz wave detecting section by synchronizing the timing with the pulse signal.

Abstract: A terahertz spectroscopic apparatus includes a polarization beam splitter transmitting or reflecting a linearly polarized terahertz wave, a quarter wave plate imparting a phase difference of 90° to a terahertz wave impinging thereon, and an optical member guiding a circularly polarized terahertz wave impinging thereon from the polarization beam splitter via the quarter wave plate to an irradiation surface.

Abstract: An optical recording medium master disc exposure apparatus comprises a modulating means 3 for modulating intensity of light from an exposure light source 1 in response to recording information and a focusing optical system 9 for focusing the light modulated by this modulating means 3 on a photoresist 12 on an optical recording medium master disc 11 to thereby pattern-expose the photoresist 12 in response to recording information. The exposure light source 1 is composed of a ultrashort wave pulse laser with a repetitive frequency of an integral multiple ranging from 1 time to 20 times as high as the clock frequency of recording information.

Abstract: An optical recording medium using Sn as the recording material to improve the jitter is provided, in which on the surface of a disc substrate 11 where a concave and convex shape dividing a track area is formed, are formed on the surface of the concave and convex shape a first protective layer 31 for protecting at least an optical recording layer 31, an optical recording layer 12 using a chemical compound at least composed of tin (Sn), nitrogen (N) and oxygen (O), formed on the first protective layer, a second protective layer 32 for protecting this optical recording layer, formed on this optical recording layer, and a light-transmittable layer 13 formed on the second protective layer; with this structure, the optical recording layer 12 under high temperature and high humidity can be stabilized by means of the first and second protective layers 31 and 32.

Abstract: An optical recording medium using Sn as the recording material to improve the jitter is provided, in which on the surface of a disc substrate 11 where a concave and convex shape dividing a track area is formed, are formed on the surface of the concave and convex shape a first protective layer 31 for protecting at least an optical recording layer 31, an optical recording layer 12 using a chemical compound at least composed of tin (Sn), nitrogen (N) and oxygen (O), formed on the first protective layer, a second protective layer 32 for protecting this optical recording layer, formed on this optical recording layer, and a light-transmittable layer 13 formed on the second protective layer; with this structure, the optical recording layer 12 under high temperature and high humidity can be stabilized by means of the first and second protective layers 31 and 32.

Abstract: An optical recording medium using Sn as the recording material to improve the jitter is provided, in which on the surface of a disc substrate 11 where a concave and convex shape dividing a track area is formed, are formed on the surface of the concave and convex shape a first protective layer 31 for protecting at least an optical recording layer 31, an optical recording layer 12 using a chemical compound at least composed of tin (Sn), nitrogen (N) and oxygen (O), formed on the first protective layer, a second protective layer 32 for protecting this optical recording layer, formed on this optical recording layer, and a light-transmittable layer 13 formed on the second protective layer; with this structure, the optical recording layer 12 under high temperature and high humidity can be stabilized by means of the first and second protective layers 31 and 32.