A manufacturing method of a light-emitting device includes: preparing a mounting substrate having a mounting surface, the mounting substrate including a first metal pattern arranged on a mounting surface side, a second metal pattern arranged on the mounting surface side inward of the first metal pattern in a plan view, and a third metal pattern arranged on the mounting surface side outward of the first metal pattern in the plan view; arranging a light-emitting element over the mounting surface of the mounting substrate; applying a bonding material to the first metal pattern; and joining a sealing member to at least the first metal pattern of the mounting substrate via the bonding material, the sealing member including a fourth metal pattern with a width greater than or equal to a width of the first metal pattern.

Systems and methods for controlling laser modulation in burst communications. In a start-up phase, a drive circuitry sequentially applies first and second drive currents to a laser diode such that it produces a first and second optical output, respectively. A compensating current source coupled to the laser diode provides a current related to the first and second drive currents to maintain a combined current flowing through an impedance connected to the laser diode at a substantially constant level during the start-up phase. An optical sensor measures the first and second optical outputs, and a controller uses values of the first and second drive currents, the outputs from the optical sensor, and at least one supplied input value to provide control values for the drive circuitry for controlling operating current of the laser diode during a subsequent operating phase, wherein information is transmitted in at least one burst.

A direct diode laser processing apparatus includes a laser oscillator including a plurality of laser diodes and emitting a multiple-wavelength laser beam, a transmission fiber transmitting the multiple-wavelength laser beam emitted from the laser oscillator, a laser processing machine collecting the multiple-wavelength laser beam transmitted through the transmission fiber and processes a workpiece, a detecting mechanism sampling part of the multiple-wavelength laser beam and detecting wavelength-by-wavelength light intensities of the sampled laser beam, a monitoring unit monitoring an output decrease in the multiple-wavelength laser beam according to a change in the wavelength-by-wavelength light intensities, and a control module controlling outputs of the plurality of laser diodes according to a monitored result from the monitoring unit. The apparatus properly monitors an output decrease in the multiple-wavelength laser beam.

An optical module for preventing laser beam leakage and a control method thereof are disclosed. The optical module including a current control circuit, a first transistor, a laser, and a laser control unit. The laser control unit is configured to: if it is detected that an optical fiber is inserted in the optical fiber interface, perform control to turn on the laser, or if it is detected that no optical fiber is inserted in the optical fiber interface, control the laser to remain in an off state. A laser beam is effectively prevented from causing human bodily injury when an optical fiber is not inserted in an optical fiber interface.

A miniature illuminator is described which is suitable for assembly into mobile electronics devices such as cell phones and computer tablets. Features of the invention overcome the complexity of current miniature illuminators by using single molded structure which includes all the electrical feedthrough connections and has the features necessary for accurate mounting of optical components. The molded structure includes laser safety connections which provide an electrical interrupt signal when the illuminator is damaged in a way that could result in propagation of non-eye safe illuminator beams. In an alternate operation the illuminator provides a signal when a subject gets too close to the illuminator and would receive unsafe VCSEL illuminator beam. The laser safety feature is integrated into the molded Illuminator package so that separate electrically connected structures to achieve this function are eliminated.

Systems, devices, and methods for providing optical engines and laser projectors that are well-suited for use in wearable heads-up displays (WHUDs) are described. The optical engines of the present disclosure may integrate a plurality of laser diodes (e.g., 3 laser diodes, 4 laser diodes) within a single, hermetically or partially hermetically sealed, encapsulated package. Wavelength stabilization for the laser diodes is achieved by controlling the temperature of the lasers to always be in a particular range of operating specifications which provides wavelength stabilization that meets particular performance criteria. The lasers themselves may be used for temperature control by selectively switching them on to maintain their temperature within a specified range. Alternatively, compact resistive heaters may be positioned proximate the laser diodes to control the temperature of the laser diodes during operation. WHUDs that employ such optical engines and laser projectors are also described. Additionally, optical systems for collimating and shifting light beams are described.

A light source device that includes a first resistor that is connected to a given potential, a light emitting element that is connected in series to the first resistor, a second resistor that is connected to the given potential, and a first current source that is connected in series to the second resistor and that is configured to supply a freely-selected current within a given range are included. A first voltage is taken out from a first connection part where the first resistor and the light emitting element are connected to each other and a second voltage is taken out from a second connection part where the second resistor and the first current source are connected to each other.

A damping circuit having an input terminal and an output terminal is described. The damping circuit comprises a driver having an input and an output; an RC circuit coupled between the input terminal and the output; and a resistor coupled between the output and the output terminal, wherein the RC circuit delays passing a signal from the output terminal to the input terminal and a low impedance associated with the driver generally reduces ringing.

A laser projection module includes a base, a laser chip, an optical element, and a first conducting wire. The base has an inner cavity and an opening connected to the inner cavity, the laser chip is disposed on a bottom wall that is of the inner cavity and that faces the opening, the optical element is mounted in the opening, a wire layer is disposed on the optical element, and the laser chip, the first conducting wire, and the wire layer are sequentially connected in series.

One or more embodiments are directed to laser circuits, methods and devices that include a current sensing circuit for sensing a lasing current provided to a laser diode or device. One embodiment is directed to a circuit that includes a laser device, a switching device, a current sensing circuit and a current comparator. The switching device has a first conduction terminal coupled to the laser device and a second conduction terminal coupled to a supply voltage. The switching device is configured to operatively supply a lasing current to the laser device. The current sensing circuit is coupled to the switching device and is configured to generate a sense current representative of the lasing current. The current comparator is configured to receive the sense current from the current sensing circuit, to receive a reference current, and to compare the sense current with the reference current. If the sense current exceeds the reference current, the current comparator is configured to output an overcurrent detection signal.