In various embodiments, laser devices feature means, such as fasteners, for attaching a laser package to a cooling plate, which allow motion of the laser package in response to thermal cycles resulting from operation of a beam emitter therewithin. Embodiments of the invention additionally or instead include laser devices featuring segmented barrier layers for electrically isolating the laser package from the cooling plate.

In various embodiments, wavelength beam combining laser systems incorporate optical cross-coupling mitigation systems and/or engineered partially reflective output couplers in order to reduce or substantially eliminate unwanted back-reflection of stray light.

A beam combining device and method for a Bragg grating external-cavity laser module has a plurality of side by side light-emitting modules that use a Bragg grating to perform wavelength locking. Output light of the modules is incident to a beam combining element after passing through a focusing optical element for beam combining, and light subjected to beam combining is reflected partially and transmitted partially under the effect of a light splitting element. A part is incident into a dispersion element at a diffraction angle of the element. Parallel light is formed under the effect of a conversion optical element. Spots of the light beams of corresponding wavelengths of the light-emitting modules are formed on an image acquisition mechanism. Whether the wavelengths of the corresponding light-emitting modules are locked is determined by whether there is a deviation between preset spots and spots formed by the module on the acquisition mechanism.

A wavelength tunable light source includes: a common wavelength filter that has periodic transmission peak wavelengths or reflection peak wavelengths and is commonly used for a plurality of channels; a wavelength tunable filter that is coupled to the common wavelength filter and has a one-input and multiple-output configuration which has a plurality of output ports, and that has a plurality of transmission peak wavelengths corresponding to the plurality of channels at the plurality of output ports; and a plurality of gain media optically coupled to the plurality of output ports of the wavelength tunable filter, wherein a plurality of laser cavities that perform laser oscillation at a plurality of different wavelengths are formed between the common wavelength filter and the plurality of gain media.

A laser system includes: a first laser element constituting one end of a first external resonator; a second laser element constituting one end of a second external resonator; a diffractive optical element to which a first beam group and a second beam group enter; a partially reflective element that constitutes an opposite end of the first external resonator and an opposite end of the second external resonator, reflects a part of the first beam and a part of the second beam, and transmits the remainder of the first beam and the remainder of the second beam; and a beam deflection element that deflects the second beam emitted from the diffractive optical element toward the partially reflective element.

A semiconductor laser device includes: a semiconductor laser element; a lower base provided with the semiconductor laser element; an upper base that is electrically insulated from the lower base, and sandwiches the semiconductor laser element together with the lower base; a lens that allows laser light that has exited from semiconductor laser element to enter, concentrates the laser light that has entered, and allows the laser light that has been concentrated to exit; and a holder that holds the lens. The holder is connected to the upper base.

Disclosed are a design method, a product and an application of a high-repetition-frequency and multi-wavelength ultrashort pulse mode-locked photonic integrated chip. Components for designing the mode-locked photonic integrated chip include a semiconductor optical amplifier array providing gains for N wavelength channels; a phase delay line array which includes phase delay lines with different lengths and separately compensates for different effective optical path differences of gain light of the wavelength channels caused by a dispersion effect; a flattened arrayed waveguide grating multiplexing the gain light with the effective optical path differences compensated, and multiplexing N-channel optical pulse signals into one-channel optical pulse signal; a saturable absorber forming, with the arrayed waveguide grating, N individual and synchronized different wavelength mode-locked optical pulse channels; and a semiconductor optical amplifier used for gaining and outputting an output pulse of the saturable absorber.

A laser array (100) is described herein, wherein the laser array comprises semiconductor lasers (102, 104) that are precisely controlled such that an optical beam output by the laser array has desired shape and direction.

In various embodiments, laser devices feature means, such as fasteners, for attaching a laser package to a cooling plate, which allow motion of the laser package in response to thermal cycles resulting from operation of a beam emitter therewithin. Embodiments of the invention additionally or instead include laser devices featuring segmented barrier layers for electrically isolating the laser package from the cooling plate.

A system and method for stabilizing and combining multiple emitted beams into a single system using both WBC and WDM techniques.