Diode arrays are compact, high-power light dynamos
نویسنده
چکیده
High-power laser-diode arrays, which are made of stacks of individual or multistripe laser diodes, or in some cases vertical-cavity surfaceemitting lasers (VCSELs), can put out watts to kilowatts of optical power for uses such as laser pumping, industrial heating, illumination, or as the input for fiber-optic direct-diode laser devices for materials processing or for medicine. Laser diodes typically have much higher electrical-to-optical (wall-plug) efficiencies than other types of lasers; in fact, they are some of the most-efficient light emitters known. The d i sadvantage of laser-diode arrays is their rela t i v e l y low beam quality— there are no sing le -mode kilowatts-level laser-diode sources in our near future. However, there are many applications that do not require a single-mode beam; in addition, laser manufacturers are constantly refining beamcombining techniques to produce ever-brighter high-power laser-diode sources.
منابع مشابه
Coherence and Synchronization in Arrays of Class B Lasers
We report preliminary results on the feasibility of a compact source of high power and high intensity coherent radiation emitted from an array of semiconductor diode lasers via the injection of a controlled electromagnetic field into the cavity of each laser. The new source is expected to generate coherent radiation of the order of magnitude of 10 Watts and to spawn a new laser technology of co...
متن کاملNitride micro-LEDs and beyond--a decade progress review.
Since their inception, micro-size light emitting diode (µLED) arrays based on III-nitride semiconductors have emerged as a promising technology for a range of applications. This paper provides an overview on a decade progresses on realizing III-nitride µLED based high voltage single-chip AC/DC-LEDs without power converters to address the key compatibility issue between LEDs and AC power grid in...
متن کاملBiologically Inspired Four Elements Compact Antenna Arrays With Enhanced Sensitivity for Direction of Arrival Estimation
A new four elements compact antenna array is presented and discussed to achieve enhanced phase resolution without sacrificing the array output power. This structure inspired by the Ormia Ochracea’s coupled ears. The analogy between this insect acute directional hearing capabilities and the electrically compact antenna array is used to enhance the array sensitivity to direction of arrival estima...
متن کاملStudy of the Mechanism of "Smile" in High Power Diode Laser Arrays and Strategies in Improving NearField Linearity
High power diode lasers have found increased applications in pumping of solid state or fiber laser systems for industrial, military and medical applications as well as direct material processing applications. The non-linearity of the near-field of emitters (or the so called “smile” effect) in a laser diode array poses significant challenges in optical coupling and beam shaping and has become on...
متن کاملThermal characteristics of high-power, long pulse width, quasi-CW laser diode arrays
2-micron solid-state lasers operating at moderate to high pulse energies require high power quasi-CW laser diode arrays (LDAs) operating at a nominal wavelength of 792 nm with pulse durations of at least one millisecond. This long pulse duration is one of the main causes of limited lifetimes for these arrays. Such relatively long pulse durations cause the laser diode active region to experience...
متن کامل