Fujikura Limited

Yasuhiro Oba

Michihiro Nakai

In a case where the period from the input of the output suspension instruction to the next output instruction is shorter than the fixed period of time, the seed laser light source and the pumping light source are in a pre-pumped state during the period from the end of the output state to the start of the next output state. In a case where the period from the input of the output suspension instruction to the next output instruction is longer than the fixed period of time, the seed laser light source and the pumping light source are in the pre-pumped state only for the fixed period of time from the input of the output instruction.

Fiber laser device

A high-power pulse light generator includes: a master oscillator generating oscillated pulse light in synchronization with a master clock signal; an optical amplifier amplifying the oscillated pulse light output from the master oscillator and outputting high-power pulsed light; a driving unit driving a pumping semiconductor laser in synchronization with the master clock signal; and a control unit controlling the driving unit so that the driving current to be supplied to the pumping semiconductor laser becomes lower than or equal to a set value at which the pumping semiconductor laser is not in a laser oscillation state when returning light from an irradiated body with the high-power pulsed light reaches the pumping semiconductor laser connected to the optical amplifier, the control unit determining a timing of the control in accordance with an optical path length between the irradiated body and the pumping semiconductor laser.

High-power pulsed light generator

When an output instruction is input to a control unit, the control unit controls a seed laser light source and a pumping light source to be either in a pre-pumped state or in an output state. In the pre-pumped state, the pumping light source outputs, for a predetermined period, pumping light with an intensity determined based on the duration of the period of time from when the output state prior to the input of the output instruction to the control unit comes to an end till when the output instruction is input to the control unit. In the output state, to cause the output unit to output laser light, the seed laser light source outputs laser light, and the pumping light source outputs pumping light.

When an output instruction is input to the control unit, the control unit controls the seed laser light source and the pumping light source to be either in a pre-pumped state or in an output state. In the pre-pumped state, laser light is not output from the seed laser light source, and pumping light with a predetermined intensity based on a laser light intensity set by the output setting unit is output from the pumping light source for a certain period of time. In the output state, laser light is output from the seed laser light source, and pumping light is output from the pumping light source, so that laser light with the intensity set by the output setting unit is output.

The invention relates to a fiber laser device. In the preliminary pumping state, the laser light is not output from the seed laser light source, the pumping light is output from the pumping light source, and the pumping light has such an intensity that the wavelength of the laser light emitted and output from the amplification optical fiberis not converted by the wavelength converter. In the output state, the laser light is output from the seed laser light source, the pumping light is output from the pumping light source, and the laser light and the pumping light have such intensities that the wavelength of the laser light amplified and output by the amplification optical fiberis converted by the wavelength converter

This high power optical connector is used at least on a light-receiving side of an optical fiber. The high power optical connector is provided with: a housing; a ferrule which is accommodated in the housing to retain the optical fiber; and a flange which is connected and fixed to the housing while being in contact with an end portion of the ferrule. The ferrule is made of a transparent glass; and the flange is made of a transparent material which transmits a light which propagates through the optical fiber.

High power optical connector and optical fiber system using the same

The present invention is a splicing structure of optical fibers for fusing a double clad fiber and a single clad fiber, the splicing structure is provided with a block covering a fusion splicing point of the double clad fiber and the single clad fiber, and which is made of a highly thermal conductive material.

Growing community of inventors

Sakura, Japan

Yasuhiro Oba