In various embodiments, laser systems or resonators incorporate two separate cooling loops that may be operated at different cooling temperatures. One cooling loop, which may be operated at a lower temperature, cools beam emitters. The other cooling loop, which may be operated at a higher temperature, cools other mechanical and/or optical components, for example optical elements such as lenses and/or reflectors.

An apparatus, and related method, relates generally to a fiber-optic sensing system. In such a system, fiber-optic sensors are in a rosette or rosette-like pattern. An optical circulator is coupled to receive a light signal from a broadband light source, to provide the light signal to the fiber-optic sensors, and to receive a returned optical signal from the fiber-optic sensors. A spectral engine is coupled to the optical circulator to receive the returned optical signal and configured to provide an output signal.

A method of manufacturing a light emitting module comprising at least one light emitting device in which a plurality of light emitting elements are mounted, includes: providing a plurality of light emitting devices including one or more first light emitting devices and one or more second light emitting devices, wherein a number of the light emitting elements mounted in the first light emitting device is different from a number of the light emitting elements mounted in the second light emitting device; providing a first mounting substrate having a mounting surface provided with a plurality of connection patterns having the same pattern, each of the connection patterns corresponding to a respective one of the light emitting devices; and mounting at least some of the plurality of light emitting devices, selected from the one or more first light emitting devices and one or more second light emitting devices, on the connection patterns.

Disclosed are an element comprising a substrate and at least two different optoelectronic devices, wherein the at least two different optoelectronic devices are monolithically fabricated on the substrate; and a method for producing the same. Also disclosed is an organic semiconductor laser diode comprising a substrate, an insulating grating, a first electrode, an organic layer and a second electrode in this order.

An optical transmitter according to one embodiment includes a housing with an emission end, a light emitting element mounted on a first mounting portion of the housing, and a light receiving element mounted on a second mounting portion of the housing to monitor output light from the light emitting element. The second mounting portion is provided with a carrier, a first resin located on an emission end side of a lower side of the carrier, and a second resin located on a light emitting element side of the lower side of the carrier. A coefficient of thermal expansion of the first resin is smaller than a coefficient of thermal expansion of the second resin.

Provided is a semiconductor laser element including: a resonator structure; and a first reflection film and a second reflection film provided on a non-emission end surface of the resonator structure and an emission end surface of the resonator structure, respectively. Reflectance R of the second reflection film at a gain wavelength satisfies the following relational expression: R1≤R≤R(Oc)×C where R1 is reflectance of the second reflection film when the resonator structure performs laser oscillation with power 1.4 times a minimum value of threshold power which is minimum power for the resonator structure to perform the laser oscillation, R(Oc) is reflectance of the external resonance mirror, and C is a ratio of light, which is reflected by the external resonance mirror and is incident in the resonator structure, to light which is reflected by the external resonance mirror.

A system and method for combining multiple emitters into a multi-wavelength output beam having a certain band and combining a plurality of these bands into a single output using non-free space combining modules.

A plurality of surface emitting lasers are formed on the single surface emitting laser element. The plurality of surface emitting lasers have respective emission wavelengths selected from wavelengths satisfying condition of:
0<λ.sub.1−λ.sub.s≤5.36×10.sup.−5λ.sub.c.sup.2−×5.83×10.sup.−2λ.sub.c+32.4 where a first emission wavelength is λ.sub.1 [nm], a second emission wavelength shorter than the first emission wavelength is λ.sub.s [nm], and a middle wavelength between the first emission wavelength and the second emission wavelength is λ.sub.c [nm]. At least one of the plurality of surface emitting lasers has an emission wavelength different from an emission wavelength of another surface emitting laser.

A light-emitting module includes a substrate, a first surface-emitting laser mounted on the substrate, the first surface-emitting laser having a first engaging portion protruded outward at an end, and a second surface-emitting laser mounted on the substrate, the second surface-emitting laser having a second engaging portion recessed inward at an end. The first surface-emitting laser and the second surface-emitting laser are adjacent to each other. The first engaging portion and the second engaging portion are engaged with each other.

A light source module that emits a combined laser beam, and includes: a plurality of semiconductor laser elements; and a control circuit that controls power of a laser beam emitted by each of the semiconductor laser elements. The semiconductor laser elements include: a first element group that emits a first laser beam; and a second element group that emits a second laser beam. The combined laser beam includes at least one of the first laser beam or the second laser beam. The control circuit maintains an average combined-beam wavelength that is an average wavelength of the combined laser beam constant for a change in power of the combined laser beam. When the power of the first laser beam and the power of the second laser beam are equal to each other, an average wavelength of the first laser beam is longer than an average wavelength of the second laser beam.