Abstract: An ultrashort light pulse oscillated from an ultrashort pulse oscillator enters a waveguide (2) via a polarization control element (3). After conversion into a supercontinuum by a nonlinear optical effect, it is compressed by a prism pair compressor (71) as pulse compressor (7), and then emitted. The waveguide (2), 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.

Abstract: An ultrashort light pulse oscillated from an ultrashort pulse oscillator enters a waveguide 2 via a polarization control element 3. After conversion into a supercontinuum by a nonlinear optical effect, it is compressed by a prism pair compressor 71 as pulse compressor 7, and then emitted. The waveguide 2, 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.

Abstract: An ultrashort light pulse oscillated from an ultrashort pulse oscillator enters a waveguide (2) via a polarization control element (3). After conversion into a supercontinuum by a nonlinear optical effect, it is compressed by a prism pair compressor (71) as pulse compressor (7), and then emitted. The waveguide (2), 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.

Abstract: Provided is a driving control method of an objective lens in which an optical-axis chromatic aberration can be corrected by driving the objective lens, and an image can be quickly captured by realizing a quick driving and stabilizing of the objective lens so as to acquire a three-dimensional image at a high speed. A driving control method of the objective lens driven by a piezoelectric actuator provided in a fluorescence microscope includes a first step of applying a pulse voltage larger than a displacement voltage making the objective lens move to a focal position of an observation target to the piezoelectric actuator for a predetermined time so as to move the objective lens near the focal position, and a second step of applying the displacement voltage to the piezoelectric actuator after the first step to stabilize the objective lens.

Abstract: Provided is a driving control method of an objective lens in which an optical-axis chromatic aberration can be corrected by driving the objective lens, and an image can be quickly captured by realizing a quick driving and stabilizing of the objective lens so as to acquire a three-dimensional image at a high speed. A driving control method of the objective lens driven by a piezoelectric actuator provided in a fluorescence microscope includes a first step of applying a pulse voltage larger than a displacement voltage making the objective lens move to a focal position of an observation target to the piezoelectric actuator for a predetermined time so as to move the objective lens near the focal position, and a second step of applying the displacement voltage to the piezoelectric actuator after the first step to stabilize the objective lens.

Abstract: A biochip reader, superior in signal to noise ratios and economical in costs, comprising a light source, a lens for collimating light emitted by the light source, an optical detector for detecting fluorescent light produced by the excitation light at samples, and an objective lens for condensing fluorescent light produced at a biochip where samples are deposited, wherein the excitation light is projected onto the substrate of the biochip at a critical angle or greater.

Abstract: A chucking device, in which a 31/2" flexible disk is centered and driven so as to rotate, is improved. A driving pin is disposed on one end of a plate spring and the other end portion is elastically energized to be brought into contact with a plurality of holding pins disposed on a turn table so as to protrude therefrom. At the chucking, since the plate spring is separated from the holding pins, sliding resistance, wear, etc. are not produced. For this reason, even if the chucking is repeated over many years, a high centering precision can be sustained.

Abstract: A cutting device for collecting a quantoback analysis sample in a hot state from a preferred position of a continuously cast steel piece is disclosed. According to this invention, a dish like recess is cut on the surface of a cast steel piece while leaving a center column, then the root of the center column is cut and the cut free portion taken out as a sample.

Abstract: In a motor speed controll apparatus for a DC motor, there are provided a frequency signal generating circuit for outputting a signal at a time period corresponding to a rotation speed of a motor, a sawtooth wave output circuit for outputting a sawtooth wave, the voltage of which increases in a constant time-constant at said time period, a holding circuit for holding a substantially peak voltage of said sawtooth wave as a signal voltage corresponding to the rotation speed of the motor, a differential amplifier circuit for comparing said signal voltage with a speed setting voltage and for outputting a speed control signal in accordance with a difference in this comparison, said speed control signal being supplied to a motor drive apparatus, an amplifier circuit interposed between the output of said holding circuit and input of said differential amplifier circuit, and an operation control circuit for controlling said amplifier circuit to an operative mode and a non-operative mode selectively, the motor being dri

Abstract: A method and a device for collecting a quantoback analysis sample in hot state from a preferred position of a continuously cast steel piece are disclosed. According to this invention, a dish like recess is cut on the surface of cast steel piece while leaving a center column, then the root of left center column is root cut and taken out as sample. A cutting device and a way for accessing the cutting device are presented for operating this process.

Abstract: A disk support device for supporting a disk having a central hub having a central support hole and a support hole includes a rotatable drive shaft, a turntable fixedly mounted on the rotatable drive shaft and having a hole for supporting the disk on one surface thereof with the rotatable drive shaft inserted in the central support hole in the disk, and a leaf spring having one end fixed to an opposite surface of the turntable and supporting a positioning pin remotely from the one end thereof, the positioning pin projecting under the resiliency of the leaf spring through the hole in the turntable for engagement in the support hole in the disk, the leaf spring having a locking finger held in engagement with the turntable.

Abstract: A disk support device for supporting a disk having a central hub, a central support hole and a rotatable drive shaft, a turntable fixedly mounted on the rotatable drive shaft and having a hole for supporting the disk on one surface thereof with the rotatable drive shaft inserted in the central support hole in the disk, a leaf spring having one end fixed to an opposite surface of the turntable and supporting a positioning pin remotely from the one end thereof, the positioning pin projecting under the resiliency of the leaf spring through the hole in the turntable for engagement in the support hole in the disk, and a stopper fixed to the opposite surface of the turntable in spaced relation thereto, the leaf spring being interposed between the opposite surface of the turntable and the stopper for being subjected to a limited extent of deformation.