Abstract: Methods and systems are described for free space optical communication. An example device may comprise an optical beam separator configured to separate a first optical path into a receiving (Rx) optical path for signals received from free space and a transmitting (Tx) optical path for signals being transmitted into free space. The example device may comprise at least one positioner coupled to one or more of the Rx optical path or the Tx optical path. The example device may comprise a controller configured to control the at least one positioner to adjust one or more of the Rx optical path or the Tx optical path to facilitate communication with a remote communication device via free space.

Abstract: A device for loading cartridge ammunition into magazines for firearms. The device comprises a base at a first end of a rear slot for engaging with a magazine feed. At least one guide rail located within the rear slot is adapted to locate the cartridge substantially in a loading orientation such that cartridges are presented to be loaded into a magazine feed when it the feed is engaged by the base.

Abstract: An optical parametric oscillator (OPO) is described that efficiently converts a near-infrared laser beam to tunable mid-infrared wavelength output. In some embodiments, the OPO includes an optical resonator containing a nonlinear crystal, such as periodically-poled lithium niobate. The OPO is pumped by a continuous-wave fiber-laser source having a low-power oscillator and a high-power amplifier, or using just a power oscillator). The fiber oscillator produces a single-frequency output defined by a distributed-feedback (DFB) structure of the fiber. The DFB-fiber-laser output is amplified to a pump level consistent with exceeding an oscillation threshold in the OPO in which only one of two generated waves (“signal” and “idler”) is resonant within the optical cavity.