This application describes a laser driver that can include a voltage source, an inductor, at least one capacitor, a diode laser, and an electronic switch. The switch may be connected to ground and may be configured to alternate between an on state and an off state. In a first on state, current may flow through the switch to the inductor and through the inductor to store energy in the inductor. In a first off state, the inductor may release the stored energy and allow current to flow to the at least one capacitor to charge the at least one capacitor. In a second on state, the at least one capacitor may discharge and allow current to flow through the diode laser to cause the diode laser to emit light energy.

A semiconductor device includes: a base including a base surface; a mesa protruding from the base surface in a first direction intersecting the base surface, the mesa including a top surface and two side surfaces on both sides of the top surface, and extending along the base surface; and an electric resistor including a top wall provided on the top surface and a side wall provided on at least one of the two side surfaces, the electric resistor being configured such that a current flows in an extending direction of the mesa.

An optical semiconductor device includes: a base including a base surface; a mesa protruding from the base surface in a first direction intersecting the base surface and extending along the base surface; an optical waveguide layer provided inside the mesa or provided inside the base so as to have a region at least overlapping with the mesa in the first direction; an electric resistance layer including a first region provided on the mesa, and a first extending portion extending from the first region in a direction intersecting an extending direction of the mesa; and a wiring layer including a second region electrically connected to the electric resistance layer and configured to partially cover the first region, and a second extending portion configured to at least partially cover the first extending portion and extending from the second region in a direction intersecting the extending direction of the mesa.

A method and apparatus provide for determining a temperature at a junction of a laser diode when the laser diode is operated in a lasing state that facilitates heat-assisted magnetic recording, comparing the junction temperature and an injection current supplied during the lasing state to stored combinations of junction temperature and injection current, and determining a likelihood of mode hopping occurring for the laser diode during the lasing state based on the comparison to stored combinations of junction temperature and injection current.

A hybrid semiconductor laser component comprising at least one first emitting module comprising an active zone shaped to emit electromagnetic radiation at a given wavelength; and an optical layer comprising at least one first waveguide optically coupled with the active zone, the waveguide forming with the active zone an optical cavity resonating at the given wavelength. The hybrid semiconductor laser component also comprises a heat-dissipating semiconductor layer, the heat-dissipating semiconductor layer being in thermal contact with the first emitting module on a surface of the first emitting module that is opposite the optical layer. The invention also relates to a method for manufacturing such a hybrid semiconductor laser component.

A light-emitting element array includes a substrate, plural light-emitting elements arranged on the substrate, plural constriction grooves being provided in a periphery of each of the plural light-emitting elements and forming a current constriction layer that constricts a current flowing through a light-emitting layer by oxidizing the light-emitting layer, and a block separation portion that is provided in a curved shape so as to include at least one inflection point at which a sign of curvature changes along each of positions where the plural light-emitting elements are arranged, and separates the plural light-emitting elements into plural blocks.

A light-emitting element array includes a substrate, plural light-emitting elements arranged on the substrate, plural constriction grooves being provided in a periphery of each of the plural light-emitting elements, and forming a current constriction layer that constricts a current flowing through a light-emitting layer by oxidizing the light-emitting layer, and a block separation portion that is formed so as to overlap a part of the plural constriction grooves in plan view, and separates the plural light-emitting elements into plural blocks.

To address the need to excite lasers at a high frequency while minimizing electrical parasitic components, the present invention embraces a system and method of exciting a laser using a direct injection of an electron beam. The system may include a low voltage electron emission device made of one or more electron sources. When the device is activated, an electrical field is applied to the tip of each electron source, causing the electron source to emit a stream of electrons. The electrons are directed into a VCSEL, causing it to emit an optical signal. In another aspect, a system for random number generation is provided. The system may also include a processor that receives a measurement of an initial random value, executes an algorithm, where at least one input of the algorithm is the initial random value, and determines a final random value.

A light-emitting component includes a substrate, plural light-emitting elements that are disposed on the substrate and emit light in a direction intersecting with a surface of the substrate, and a gate electrode that is electrically connected to each of the plural light-emitting elements and that performs control so that the plural light-emitting elements are switched ON/OFF together. A distance between each of the plural light-emitting elements and the gate electrode is smaller than a largest distance between two light-emitting elements among the plural light-emitting elements.

A light-emitting component includes a substrate and plural light-emitting elements that are disposed on the substrate and emit light in a direction intersecting with a surface of the substrate and that are switched ON/OFF together. The plural light-emitting elements include a gate layer, the gate layer performing control so that the plural light-emitting elements are switched ON/OFF together, a film thickness of the gate layer being greater than a wavelength of light emitted from the plural light-emitting elements.