Abstract: According to the present disclosure, provided is a network system including a plurality of devices and a network management apparatus connected to the plurality of devices by an IP transmission line, and the network management apparatus (100) includes a setting execution unit (116) configured to execute setting of a path to which the plurality of devices are connected, and setting of parameters for controlling the plurality of devices. With this configuration, it is possible to freely set a connection path and devices in a system in which a plurality of devices are connected.

Abstract: A data communication device includes: a reception unit that receives data from a transmission device; a transmission unit that transmits the data to a reception device; a setting unit that sets, when the reception unit starts to receive the data, an amount of the data received by the reception unit to an amount that is independent from a transmission speed of the data from the transmission unit to the reception device; an updating unit that updates the set amount to an amount that corresponds to the transmission speed after the reception unit has received the set amount of the data; and a suppression unit that interrupts the transmission device from transmitting the data until the transmission unit transmits the updated amount of the data after the reception unit has received the updated amount of the data.

Abstract: A data compression device (e.g. a server device for relaying streaming contents) determines whether or not congestion occurs in a communication network for communicating with a data compression approval device (e.g. a terminal device). Upon receiving a congestion occurrence signal and a data compression inquiry signal, the data compression approval device generates and transmits a data compression response signal to the data compression device. Upon receiving the data compression response signal, the data compression device compresses and transmits content data to the data compression approval device when it determines that congestion occurs in the communication network. Thus, even when an operator fails to confirm user's approval of compressing content data by a user's contract, it is possible to compress and transmit content data to the data compression approval device depending on the congestion in the communication network, thus suppressing congestion occurring in the communication network.

Abstract: An electric oil pump includes a rotor driven to rotate by a motor and a pump body having a pump chamber accommodating the rotor, an intake port for introducing oil into the pump chamber according to rotation of the rotor, a discharge port for discharging oil from the pump chamber according to rotation of the rotor, a first discharge passage communicated to a first communication hole provided in the discharge port and circulating oil discharged from the discharge port, the first discharge passage having a smaller cross sectional area than the discharge port, and a second discharge passage communicated to a second communication hole provided in the discharge port separately from the first communication hole and circulating oil discharged from the discharge port, the second discharge passage having a smaller cross sectional area than the discharge port.

Abstract: A laser oscillator of a laser processing apparatus includes a pair of terminating mirrors, between which a straight light path lies, and also includes a ¼ wavelength plate, an active medium, a higher harmonic wave separating/outputting mirror, a condensing lens, and a nonlinear optical crystal (wavelength converting crystal) that are lined up at given intervals on the light path between the terminating mirrors. The focus of the optical lens is determined to be near a reflection surface of the first terminating mirror, so that the optical lens is disposed to be separated from the reflection surface of the first terminating mirror by a distant approximately equal to a focal distance across the nonlinear optical crystal on the light path of an optical resonator.

Abstract: The present invention is a wavelength conversion laser apparatus for converting wavelength by utilizing a nonlinear optical crystal and capable of safely using it over a long time. For this end, the fundamental wave laser light emitted from the pumping chamber unit 3 which is a solid state laser light source is converted into the second harmonic wave by the first nonlinear optical crystal unit 20. And the second harmonic wave is, then, converted into the third (or fourth) harmonic wave by the second nonlinear optical crystal unit 30. Filled in the container 24, 35 for each of the nonlinear optical crystal units 20, 30 is a dry inert gas. A humidity sensor 51 detects humidity inside the container. The output from the humidity sensor 51 is supplied to the laser control portion 58. When the detected humidity exceeds a predetermined value, the laser oscillation is interrupted, thereby preventing the nonlinear optical crystal from being damaged in case of any defect in the sealing structure of the container.

Abstract: The solid state laser comprises the laser medium 11 for absorbing the pumping light 12 from the LD 10 and generating or amplifying the light having a predetermined wavelength and a heat sink comprising the first block 15a, the second block 15b and the third block 15c for aligning the laser medium 11, cooling the laser medium 11 and reflecting the pumping light 12. The laser medium 11 has an arcuate light incident surface A and a flat reflection portion. The pumping light 12 having a diffusing angle is converted into parallel light by the light incident surface A, thereby pumping the laser medium 11 uniformly. The flat reflection portion makes it easy to align laser medium 11 having anisotropic characteristic and helps to efficiently pump the laser medium 11 by reflecting the reflection light substantially in parallel with the incident light.

Abstract: A laser system is enabled to generate laser beam stably for a long term by avoiding the decay of nonlinear optical crystals due to moisture. The fundamental laser wave at a wavelength of 1064 nm is emitted from the pumping chamber unit of the solid-state laser device. The fundamental laser wave enters the first nonlinear optical crystal unit (20). The wavelength of the laser beam is converted into a half by the first nonlinear optical crystal unit (20). The converted laser beam emanates out of the unit. The fundamental laser wave and the second harmonic laser wave are introduced into the second nonlinear optical crystal unit. Each of the laser beams is converted into the third harmonic laser wave (three-time fundamental frequency) or the fourth harmonic laser beam (four-time fundamental frequency) and the laser beam comes out of the exit-window (34). The nonlinear optical crystal units (20), (30) are held in a hermetically sealed cell whose inner surface is treated to be water-repellent.

Abstract: The laser apparatus is disclosed that includes laser medium, a pair of mirrors and a regulator contained in the case, and is capable to regulate the output laser power without affection to the character of the laser light. A half-wave plate receives the laser light excited in the laser medium and rotates the plane of polarization of the laser light. A polarizer receives the laser light passed through the half-wave plate and separates the laser light into the first polarized straight light and the second polarized branch light. A photo detector detects the intensity of the second polarized light. According to the detected intensity, the half-wave plate is controlled to rotate to keep the intensity of the first polarized straight light constant. The laser apparatus also includes a maximum output display device to display the maximum output of the laser light and a final output display device to display the final output of the laser light.

Abstract: The present invention is a wavelength conversion laser apparatus for converting wavelength by utilizing a nonlinear optical crystal and capable of safely using it over a long time. For this end, the fundamental wave laser light emitted from the pumping chamber unit 3 which is a solid state laser light source is converted into the second harmonic wave by the first nonlinear optical crystal unit 20. And the second harmonic wave is, then, converted into the third (or fourth) harmonic wave by the second nonlinear optical crystal unit 30. Filled in the container 24, 35 for each of the nonlinear optical crystal units 20, 30 is a dry inert gas. A humidity sensor 51 detects humidity inside the container. The output from the humidity sensor 51 is supplied to the laser control portion 58. When the detected humidity exceeds a predetermined value, the laser oscillation is interrupted, thereby preventing the nonlinear optical crystal from being damaged in case of any defect in the sealing structure of the container.

Abstract: The solid state laser comprises the laser medium 11 for absorbing the pumping light 12 from the LD 10 and generating or amplifying the light having a predetermined wavelength and a heat sink comprising the first block 15a, the second block 15b and the third block 15c for aligning the laser medium 11, cooling the laser medium 11 and reflecting the pumping light 12. The laser medium 11 has an arcuate light incident surface A and a flat reflection portion. The pumping light 12 having a diffusing angle is converted into parallel light by the light incident surface A, thereby pumping the laser medium 11 uniformly. The flat reflection portion makes it easy to align laser medium 11 having anisotropic characteristic and helps to efficiently pump the laser medium 11 by reflecting the reflection light substantially in parallel with the incident light.

Abstract: Disclosed is a dielectric barrier excimer lamp which is easy to handle, less expensive and improved in ultraviolet light beam irradiation efficiency to electric power and ultraviolet light beam irradiation efficiency to a work.

Abstract: An ultraviolet ray irradiation apparatus has a turntable which mounts a substance to be processed, a driving source which rotates and drives the turntable, a filter which adjusts light quantity of an ultraviolet light beam that reaches a surface to be processed of a substance W to be processed in accordance with shapes of an ultraviolet beam passing region. In the filter, the shape of the ultraviolet light beam passing region is symmetrical for a center line for a length direction of the irradiating range of the ultraviolet light beam. At least a portion near a center of the irradiating range of the ultraviolet light beam of each line segment that forms a boundary of the ultraviolet light beam passing region in a width direction of the ultraviolet light beam passing region is substantially expressed by a quadratic curve that a distance r in the length direction of the irradiating range of the ultraviolet light beam on the basis of the center line is variable.

Abstract: A solid state laser provided with a pair of mirrors constituting a laser resonator and a plurality of non-linear optical crystals placed between the pair of mirrors in such a manner to have an optical axis in common therewith and a pump source for irradiating pump light on the plurality of non-linear optical crystals. In the solid state laser, the non-linear optical crystals are operative to generate both of fundamental-wave laser light and harmonic laser light in response to the pump light.

Abstract: In a solid-state laser device for producing an outgoing laser beam having a waveband of near infrared radiation that is represented by a specific wavelength of, for example, 0.85 .mu.m, the solid-state laser device comprises a semiconductor laser device for producing an excitation laser beam having an excitation wavelength of, for example, 806 nm. By the excitation laser beam, a first laser medium such as a self-frequency doubling crystal produces a first laser beam having a first wavelength of, for example, 0.5315 .mu.m. The first wavelength is equal to a wavelength of a second harmonic of the first laser medium is shorter than the specific wavelength. Excited by the first laser beam, a second laser medium such as an Er:LiYF.sub.4 crystal produces a second laser beam having a second wavelength equal to the specific wavelength. The solid-state laser device thereby produces the second laser beam as the outgoing laser beam.

Abstract: In a solid-state blue laser device for producing a blue laser beam having a waveband of blue spectral range that is represented by a specific wavelength of, for example, 0.45 .mu.m, the solid-state blue laser device comprises a semiconductor laser device for producing an excitation laser beam having an excitation wavelength of, for example, 0.8 .mu.m. Excited by the excitation laser beam, a self-frequency doubling crystal, such as Nd.sub.x Y.sub.1-x Al.sub.3 (BO.sub.3).sub.4 where x has a value selected between 0.005 and 0.04, both exclusive, produces a harmonic laser beam having a wavelength of a second harmonic thereof that is equal to the specific wavelength. The solid-state blue laser device thereby produces the harmonic laser beam as the blue laser beam. The solid-state blue laser device may further comprise a condensing lens for condensing, as a condensed laser beam, the excitation laser beam onto the self-frequency doubling crystal.

Abstract: In an acoustooptic modulation device, a plurality of split light beams are produced from a beam splitter in response to a single incident light beam and projected onto partial modulators comprising acoustooptic mediums and transducers attached to the mediums, respectively. The transducers have different thicknesses to vary input impedances of the respective partial modulators and are supplied from an electric signal circuit with modulated electric signals falling within frequency bands different from one another, respectively. Preferably, modulated light beams are produced from the partial modulators through an optical system to be focussed into a predetermined geometric arrangement. The beam splitter may be a body having a pair of parallel surfaces covered with reflection and semitransparent layers, a diffraction grating, or a fiber grating.

Abstract: In an acoustooptic device for use in acoustooptically controlling a laser beam in response to an electric signal, an acoustooptic element is packaged in a housing which defines an internal space therein and which can circulate a coolant in the internal space through inlet and outlet portions to directly cool the acoustooptic element by the coolant. The housing comprises a case block providing the internal space and a pair of cap members which forms windows for the laser beam, respectively, and which is hermetically attached to the case block with a pair of seal members interposed between the case block and each of the cap members. Each seal member comprises a first O-ring placed around the window and a second O-ring placed outside of the first O-ring to hermetically seal the internal space.

Abstract: A plurality of slab-shaped laser media are surrounded by an internal reflection surface of a reflector member and kept substantially parallel to each other by a supporting member. Internal gaps are left between two adjacent ones of the media and additional gaps are left between two endmost ones of the media and the internal reflection surface. A plurality of lamp members are located within the internal and additional gaps so that each lamp member effectively excites two adjacent media in the internal gaps, and a single medium in cooperation with the internal reflection surface in each additional gap. Each medium produces a laser beam along a traveling direction as a result of excitation. Each lamp member may be a single or a plurality of elongated flash lamps parallel to or transverse to the traveling direction. Alternatively, each lamp member may be a flat excitation lamp having flat surfaces juxtaposed to each medium.

Abstract: Responsive to a plurality of parallel light beams and electric signals corresponding to the parallel light beams, an acoustic modulation element produces output light beams modulated by acoustic waves resulting from the electric signals. The element comprises a single acoustooptic medium block receiving the parallel beams on a first surface thereof and emitting the output light beams from a second surface opposite to the first surface. A plurality of transducer units are laid in parallel on a third surface of the block between the first and the second surfaces along the respective parallel beams so as to propagate the acoustic waves into the block when activated by the electric signals. The block may have a fourth surface opposite to the third surface and arcuately or triangularly recessed towards the third surface.