Abstract: Laser processing head (10) includes a bend mirror that bends a second laser beam in a direction intersecting a first laser beam; a dichroic mirror that transmits most of the first laser beam and reflects most of the second laser beam; a workpiece-side condensing lens that condenses the most of the each laser beam to irradiate the workpiece; an image sensor that receives a rest of the first laser beam reflected by the dichroic mirror and a rest of the second laser beam transmitted through the dichroic mirror; a detection-side condensing lens that condenses the rest of the each laser beam to irradiate the image sensor; and an adjuster that adjusts a workpiece-side condensing state on an image plane on a workpiece side. The image sensor detects a detection-side condensing state on an image plane on an image sensor side. The workpiece-side condensing state is adjusted by the adjuster based on the detection-side condensing state.

Abstract: Laser processing head (10) includes housing (11) and a plurality of optical components. Housing (11) includes first and second light entrance ports (12a) and (12b) through which first and second laser beams (A) and (B) are incident, and light irradiation port (13). Second laser beam (B) has a wavelength different from first laser beam (A). The plurality of optical components include bend mirror (30), dichroic mirror (40), aperture (71), and detection-side condensing lens (70). First and second laser beams (A) and (B) transmitted through detection-side condensing lens (70) are received by image sensor (60). Aperture (71) is configured to be able to reduce diameters of first and second laser beams (A) and (B) incident on detection-side condensing lens (70).

Abstract: A laser processing apparatus includes at least a laser oscillator, optical fiber (30), and laser head (40). Laser head (40) includes at least first and second shield glasses (45) and (47) and first and second light receivers (51) and (52) inside second housing (41). In first and second shield glasses (45) and (47), first and second coating films (46) and (48) are respectively provided on light receiving surfaces of laser light (LB). First light receiver (51) receives laser light (LB) reflected by first coating film (46) and outputs a first light receiving signal, and second light receiver (52) receives laser light (LB) reflected by peripheral portion (48b) of second coating film (48) and outputs a second light receiving signal.

Abstract: Laser processing head 10 includes housing 11 and a plurality of optical components. Housing 11 is provided with partition wall 11a, first and second light entrance ports 12a, 12b through which first and second laser beams A, B respectively enter, and light irradiation port 13. Laser processing head 10 includes first and second photodetectors 91b, 92a provided around first and second light entrance ports 12a, 12b, respectively. First photodetector 91b is disposed opposite to second photodetector 92a across partition wall 11a. First photodetector 91b receives light in the second wavelength band including the wavelength of second laser beam B, and second photodetector 92a receives light in the first wavelength band including the wavelength of first laser beam A.

Abstract: Laser device (100) includes first and second laser oscillators (1), (2) that respectively emit first and second laser lights (LB1), (LB2) having first and second wavelengths, and first and second optical systems (10), (20). First optical system (10) is configured to couple first and second laser lights (LB1), (LB2) to transmit the first and second laser lights to second optical system (20), and second optical system (20) is configured to condense first laser light (LB1) at first condensing position (FP1) and second laser light (LB2) at second condensing position (FP2). A maximum angle formed by an optical axis and an outermost component of first laser light (LB1) emitted from first optical system (10) is different from a maximum angle formed by an optical axis and an outermost component of the second laser light (LB2).

Abstract: There is provided an image pickup device including: an optical filter including a first birefringent member; a second birefringent member; a liquid crystal layer disposed between the first and second birefringent members and configured to control polarization; and an electrode configured to apply an electric field to the liquid crystal layer; and a drive circuit configured to apply an intermediate voltage or an intermediate frequency to the electrode.

Abstract: There is provided a transmitted light volume adjusting apparatus including a first polarizing plate provided on an optical axis, the first polarizing plate being configured to transmit light in a first polarizing direction, a second polarizing plate provided on the optical axis at a back stage of the first polarizing plate, the second polarizing plate being configured to transmit light in a second polarizing direction, and a first actuator configured to rotate the first polarizing plate and the second polarizing plate around a direction of the optical axis as a rotation axis direction in a state in which a difference between polarizing axes, which is an angle formed by the first polarizing direction and the second polarizing direction, is kept constant.

Abstract: There is provided an image pickup device including: an optical filter including a first birefringent member; a second birefringent member; a liquid crystal layer disposed between the first and second birefringent members and configured to control polarization; and an electrode configured to apply an electric field to the liquid crystal layer; and a drive circuit configured to apply an intermediate voltage or an intermediate frequency to the electrode.

Abstract: There is provided a transmitted light volume adjusting apparatus including a first polarizing plate provided on an optical axis, the first polarizing plate being configured to transmit light in a first polarizing direction, a second polarizing plate provided on the optical axis at a back stage of the first polarizing plate, the second polarizing plate being configured to transmit light in a second polarizing direction, and a first actuator configured to rotate the first polarizing plate and the second polarizing plate around a direction of the optical axis as a rotation axis direction in a state in which a difference between polarizing axes, which is an angle formed by the first polarizing direction and the second polarizing direction, is kept constant.