Abstract: A laser gas estimation device includes a laser oscillator including a ventilator which circulates a laser gas, a discharge tube, a ventilator power unit which supplies power to the ventilator, and a discharge tube power unit which supplies power to the discharge tube, a detection unit which detects gas pressure of the laser gas, ventilator voltage applied to the ventilator, ventilator current supplied to the ventilator, discharge tube voltage applied to the discharge tube, and discharge tube current supplied to the discharge tube, and a composition ratio estimation unit which estimates the composition ratio of the laser gas based on a detected value detected by the detection unit.

Abstract: An output coupler and a rear mirror of a laser oscillator are made of materials having first reflectance and second reflectance with respect to laser beam. A first coating material that has reflectance higher than the first reflectance is coated at an inner side of a first circle of a first surface of the output coupler, and no coating material is coated at an outer side of the first circle. A second coating material that has reflectance higher than the second reflectance and higher than that of the first coating material is coated at an inner side of a second circle of a first surface of the rear mirror, and no coating material is coated at an outer side of the second circle.

Abstract: A laser oscillator includes a discharge tube having a discharge area in which laser gas is excited and an output coupler and a rear mirror respectively arranged at both sides of the discharge tube. A first coating material having first reflectance is stacked as a dielectric multilayer on a first area including a radial center portion of a surface of the output coupler, which faces the discharge area, and a second coating material having second reflectance higher than the first reflectance is stacked as a dielectric multilayer on a second area around the first area.

Abstract: A laser oscillator which can keep distributions of pressure of a laser medium inside of a plurality of discharge tubes constant while making the laser medium circulate without stagnating. The laser oscillator is comprised of a first discharge tube, second discharge tube, first light guide, laser medium flow path, and blower. A flow resistance of a laser medium flow path between the blower and the first discharge tube and a flow resistance of the laser medium flow path between the blower and second discharge tube are the same as each other. A flow resistance of the laser medium flow path between the blower and a first end of the first light guide and a flow resistance of the laser medium flow path between the blower and a second end of the first light guide differ from each other.

Abstract: A laser gas estimation device includes a laser oscillator including a ventilator which circulates a laser gas, a discharge tube, a ventilator power unit which supplies power to the ventilator, and a discharge tube power unit which supplies power to the discharge tube, a detection unit which detects gas pressure of the laser gas, ventilator voltage applied to the ventilator, ventilator current supplied to the ventilator, discharge tube voltage applied to the discharge tube, and discharge tube current supplied to the discharge tube, and a composition ratio estimation unit which estimates the composition ratio of the laser gas based on a detected value detected by the detection unit.

Abstract: A laser processing device (100) includes a laser oscillator (2), a laser machine (11) and a control means (1) for controlling the laser oscillator and the laser machine. The control means includes a storage means (50) for storing the processing program (60) for the work to be processed. The storage means has stored therein a required laser gas pressure value (72) for the laser oscillator in the laser processing operation, which value is determined in accordance with the processing specifics the work (20). The control means includes a laser gas pressure command transmission means (52) for transmitting a laser gas pressure command based on the required laser gas pressure value to the laser oscillator. This further improves the processing performance of the laser processing apparatus. Further, the control means may include a required laser gas pressure value adjusting means (55) for adjusting the required laser gas pressure value.

Abstract: A laser oscillator capable of restraining the generation of a diffracted beam so as to obtain a laser beam with high power and high quality. The laser oscillator has an output mirror, a rear mirror and first and second concave mirrors. These mirrors cooperate together so as to form a laser beam profile. First and second beam waists are formed in the laser beam profile, between the output mirror and the first concave mirror and between the second concave mirror and the rear mirror, respectively. The laser oscillator includes a first aperture positioned generally in the middle of an optical path between the output mirror and the first beam waist and a second aperture positioned generally in the middle of the optical path between the first beam waist and the first concave mirror.