A laser package is described, the laser package comprising a plurality of laser diodes separately attached to at least one sub-mount having respective connecting pads, wherein, during operation, each of the laser diodes emits light having a fast axis and a slow axis defining a fast axis plane and a slow axis plane, wherein the fast axis planes of all laser diodes are parallel to each other and the distance between the fast axis planes of at least two laser diodes is smaller than the lateral distance between these laser diodes. Furthermore, a system with at least two laser packages is described.

An electrically tunable non-reciprocal phase shifter, an electrically tunable polarization filter, a NALM mode-locked laser and a Sagnac loop are provided. The electrically tunable non-reciprocal phase shifter includes a modulation crystal device, a birefringent crystal device, a Faraday rotator, and a fiber coupler. The phase shifter is configured to couple two beams of light to a fast axis and a slow axis of the modulation crystal device, respectively; and change a refractive index difference between the fast axis and the slow axis to introduce different phase delays for the two beams of the light, so as to control a non-reciprocal linear phase shift amount between the two beams of the light.

A coherent fiber array laser power projection system scalable to large number of subapertures and includes sensors that produce signals dependent upon beam characteristics, and controllers configured to control beam characteristics to achieve either phasing of outgoing beams at transmitter plane or coherent beam combining at a remote target or both.

Embodiments discussed herein refer to LiDAR systems that use refraction compensation to improve transmission efficiency of light energy through transmissive mediums such as covers. Refraction compensation can be achieved using a cover or an anti-reflective coating.

A macroscopic entanglement state in which a polarization state has a strong quantum correlation is realized by use of a macroscopic laser light. A laser oscillator includes a ring resonator having an optical fiber ring, an optical amplifier for maintaining an amplitude of a laser pulsed light propagating on the optical fiber ring, and three optical fibers that are connected with respective polarization controllers, and, after changing a polarization state of the laser pulsed light being a qubit extracted at a predetermined branch ratio from the optical fiber ring by the polarization controllers, couples the changed laser pulsed light whose polarization state has been changed with the laser pulsed light propagating on the optical fiber ring, and each polarization controller rotates the polarization state of the laser pulsed light with an S1 axis, an S2 axis, and an S3 axis, which are orthogonal to each other, as a rotation axis.

A thin film Brewster coupling device configured for low loss transmission of an imposed polarized parallel to plane of incidence 8.5 micron to 11.5 micron wavelength laser beam and simultaneous high reflectivity of a polarized perpendicular to plane of incidence 2 micron to 4 micron wavelength laser beam. The device comprising an optical media substrate and at least one dielectric stack optically coupled to the optical media substrate where the dielectric stack comprises a dielectric layer and an overlayer, the dielectric layer and the overlayer each comprising a thickness of nominally a quarter wavelength of the 2 micron to 4 micron wavelength laser beam, and oriented at near the Brewster Angle to the incident 8.5 micron to 11.5 micron wavelength laser beam. The substrate and dielectric mediums of necessary characteristics to result in low LIDT, high strength, chemical inertness and high thermal conductivity.

An optically pumped on-chip solid-state laser includes a solid gain media substrate and a laser generating structure disposed above the solid gain media substrate. The laser generating structure includes a resonator, a pump light input structure, and a laser light output structure; and the resonator is disposed between the pump light input structure and the laser light output structure, and is propped against or is in clearance fit with the solid gain media substrate.

A method and system for amplifying seed laser radiation which is irradiated along an irradiation direction into a lasing amplification medium has a transverse seed laser intensity profile that is transformed into a plateaued input intensity profile by a transformer element on the irradiation side.

Described herein are methods for developing and maintaining pulses that are produced from compact resonant cavities using one or more Q-switches and maintaining the output parameters of these pulses created during repetitive pulsed operation. The deterministic control of the evolution of a Q-switched laser pulse is complicated due to dynamic laser cavity feedback effects and unpredictable environmental inputs. Laser pulse shape control in a compact laser cavity (e.g., length/speed of light <˜1 ns) is especially difficult because closed loop control becomes impossible due to causality. Because various issues cause laser output of these compact resonator cavities to drift over time, described herein are further methods for automatically maintaining those output parameters.

A phase difference measuring device is provided with a phase conversion device and a detection device. The phase conversion device converts a first laser beam that passes therethrough so that the first laser beam includes a phase distribution of one cycle in an azimuth direction in a cross section of the first laser beam included in an arbitrary virtual plane perpendicular to an optical axis of the first laser beam. The detection device detects an azimuth angle of an intensity centroid of an interference pattern generated by at least a part of a first laser beam that has passed through the phase conversion device, and a part of a second laser beam that derives from a laser beam as seed light from which the first laser beam derives, of which an optical intensity is same as the at least a part of the first laser beam, and detects an inter-beam phase difference of the second laser beam.