Provided is a tunable laser source including a plurality of optical waveguides, at least three optical resonators provided between the plurality of optical waveguides and optically coupled to the plurality of optical waveguides, the at least three optical resonators having different lengths, and at least one optical amplifier provided on at least one of the plurality of optical waveguides, wherein a ratio of a first length of a first optical resonator of the at least three optical resonators to a second length of a second optical resonator of the at least three optical resonators is not an integer.

A laser processing method of performing laser processing on a transparent material that is transparent to ultraviolet light by using a laser processing system includes: performing relative positioning of a transfer position of a transfer image and the transparent material in an optical axis direction of a pulse laser beam so that the transfer position is set at a position inside the transparent material at a predetermined depth ΔZsf from a surface of the transparent material in the optical axis direction; and irradiating the transparent material with the pulse laser beam having a pulse width of 1 ns to 100 ns inclusive and a beam diameter of 10 μm to 150 μm inclusive at the transfer position.

A wavelength-tunable laser device includes: a wavelength-tunable light source part; an optical filter; a light receiving element; and a control device. Further, the control device includes: a monitor value calculating part configured to calculate a monitor value; a storage part configured to store wavelength control information; a target value calculating part configured to calculate a control target value; and a wavelength control part configured to control the wavelength of the laser beam to be the target wavelength, and the wavelength control information is information in which a wavelength, a control reference value, and mode identification information are associated with each other, and the target value calculating part calculates the control target value based on the wavelength control information stored in association with the same mode identification information when the same wavelength as the target wavelength is different from the wavelength control information stored in the storage part.

A semiconductor optical integrated device in which a forward-bias optical device and a semiconductor laser are monolithically integrated on a semiconductor substrate, includes: a passive waveguide portion that is arranged between the forward-bias optical device and the semiconductor laser; and a ground electrode that is arrange on a lower surface of the semiconductor substrate. Further, the semiconductor laser includes a mirror having a length on a side closer to the forward-bias optical device, the forward-bias optical device includes a forward-bias optical-device electrode on a side opposite to a side in contact with the semiconductor substrate, the passive waveguide portion includes a passive waveguide electrode on a side opposite to a side in contact with the semiconductor substrate, and the passive waveguide electrode is electrically connected to the ground electrode.

Provided is a semiconductor laser including: a core layer having an active layer and a diffraction grating layer optically coupled to the active layer; and paired clad layers arranged sandwiching the core layer, and formed with a waveguide along the core layer, and the semiconductor laser includes: a flat layer provided continuously with the diffraction grating layer along the waveguide; and a temperature control mechanism for controlling the temperature of the flat layer to a temperature different from that of the diffraction grating layer.

Embodiments of this application disclose a laser frequency modulation method and device, a storage medium, and a laser device. The method includes: obtaining the current sweep mode of the laser device in a timing manner; when the current sweep mode is the single-band sweep mode, controlling the laser device to perform continuous sweeping on the preset band; and when the current sweep mode is the multi-band switching mode, obtaining the next band for the laser device to perform sweeping, and controlling the laser device to switch from the band to the next band.

A control system includes one or more laser diodes generating a spectral output at a specific center wavelength when the one or more laser diodes are at a target temperature range, one or more oscillating heat pipes, one or more sensors configured to monitor a current temperature of the one or more laser diodes, and a heater configured to generate heat. The one or more laser diodes are thermally coupled to the one or more oscillating heat pipes. The control system also includes one or more processors in electronic communication with the one or more laser diodes and the heater and a memory coupled to the one or more processors. The memory stores data into one or more databases and program code that, when executed by the one or more processors, causes the control system to instruct the heater to generate heat for pre-heating the one or more laser diodes to the target temperature range.

An optical transmitter module includes a semiconductor laser device, optical modulator, temperature adjusting device which includes a substrate, a first installation part and a second installation part, a package having a bottom surface opposite to a back surface of the substrate, the package housing the semiconductor laser device, the optical modulator, and the temperature adjusting device; and a middle block disposed between a first temperature controlling element a the second temperature controlling element, the middle block having a back surface directly or indirectly fastened to a principal surface of the substrate.

A packaged transmitter device includes a base member comprising a planar part mounted with a thermoelectric cooler, a transmitter, and a coupling lens assembly, and an assembling part connected to one side of the planar part. The device further includes a circuit board bended to have a first end region and a second end region being raised to a higher level. The first end region disposed on a top surface of the planar part includes multiple electrical connection patches respectively connected to the thermoelectric and the transmitter. The second end region includes an electrical port for external connection. Additionally, the device includes a cover member disposed over the planar part. Furthermore, the device includes a cylindrical member installed to the assembling part for enclosing an isolator aligned to the coupling lens assembly along its axis and connected to a fiber to couple optical signal from the transmitter to the fiber.

A light detection and ranging (LIDAR) device includes a substrate layer, a cladding layer, a waveguide, and an ohmic element. The cladding layer is disposed with the substrate layer. The waveguide runs through the cladding layer. The ohmic element runs through the cladding layer. The ohmic element is arranged to impart heat to the waveguide when an electrical current is driven through the ohmic element.