Semiconductor amplifiers and lasers with tapered gain regions provide the highest-brightness all-semiconductor sources of near infrared continuous wave (CW) power and have many useful applications. Simple models of these devices are described. Their applications, device performance and brightness limitations are reviewed1.

Semiconductor amplifiers and lasers with tapered gain regions

Apparatus for providing optical radiation (10) comprising a pump array (8) for providing pump radiation (7), a first pump combiner (1), and a waveguide (3), wherein the pump radiation (7) from the pump array (8) is coupled into the waveguide (3) via the first pump combiner (1), and wherein the waveguide (3) comprises a pump guide (4) for guiding the pump radiation (7), and a gain medium (5) which emits the optical radiation (10) when it is pumped by the pump radiation (7).

Apparatus for providing optical radiation

The spectral and spatial behavior of monolithically integrated distributed-feedback tapered master-oscillator power amplifiers emitting around 973 nm is experimentally and theoretically investigated We demonstrate a good agreement between experiments and theory and analyze peculiarities of the observed dynamical regimes

Measurement and Simulation of Distributed-Feedback Tapered Master-Oscillator Power Amplifiers

A monochromatic red (R), green (G), blue (B) pulsed laser light source (Fig. 2) for use in a full color video/image display system, particularly an LCD display system (Fig. 3), the light source generating R,G,B laser beams with minimum speckle noise, and having a digital color space conversion incorporated within.

Monochromatic R,G,B laser light source display system and method

The invention provides low solar reflectance, low-emissivity coatings The invention also provides a pane bearing a low solar reflectance, low-emissivity coating Further, the invention provides an insulating glass unit comprising first and second panes held in a spaced-apart configuration, wherein the panes have confronting inner surfaces oriented toward a between-pane space and opposed outer surfaces oriented away from the between-pane space, and wherein one of these inner surfaces bears a low solar reflectance, low-emissivity coating Also provided are methods of producing coated substrates

Low-emissivity coating having low solar reflectance

A diode-pumped monolithic laser is fabricated from a self-doubling host material co-doped with two ionic species, where one ionic dopant converts pump radiation to continuous radiation at a fundamental frequency and the other dopant acts as a saturable absorber to Q-switch the fundamental radiation which is then frequency doubled to produce pulsed high-intensity green light, the green light being either outputted or further frequency-doubled, into pulsed coherent UV radiation, by means of a non-linear crystal.

Miniaturized self-q-switched frequency-doubled laser

We frequency doubled the single-frequency beam from an external-cavity tapered laser diode operating at 780??nm in a resonant cavity containing a ?-barium borate crystal to generate an output at 390??nm with high efficiency Output powers as great as 233??mW were obtained, corresponding to an efficiency of 65%/W The resonant-cavity design was a low-loss three-mirror configuration that provided compensation for astigmatism and coma The laser diode frequency was locked to the doubling-cavity resonance by use of the Hansch–Couillaud discrimination technique

High-power 390-nm laser source based on efficient frequency doubling of a tapered diode laser in an external resonant cavity.

An optical waveguide laser, preferably a fiber laser, has unintentionally incorporated impurities disposed in the lasing medium which upconvert a portion of the lasing radiation to radiation of shorter wavelength, thereby introducing defects in the medium which result in increased absorption due to photodarkening. Suitable rare-earth co-dopants are intentionally incorporated during the manufacture of the fiber for effectively shunting the upconversion process. The lifetime of the fiber laser is thereby increased.

Laser composition for preventing photo-induced damage

Novel solid state gain mediums provide monolithic lasers with short cavity lengths and with the ability to efficiently lase in the lowest order TEM 00 mode. Unoptimized optical power conversion efficiency of 35% has been achieved with the novel solid state gain mediums in monolithic lasers that have a cavity length as short as 0.5 mm. With proper values for the output mirror reflectivity and low loss host crystals, the optical power conversion efficiency is approximately 50%. Moreover, when in optical contact with a frequency doubling optically non linear crystal, the novel solid state gain mediums in the monolithic lasers can produce coherent visible light.

Solid state gain mediums for optically pumped monolithic laser

Continuous-wave passive Q-switched operation of multiple-contact AlGaAs laser diodes is described. Stable pulses having an energy of 300 pJ and a duration of 40 ps were obtained from 100 µm wide devices with an 800 A thick active layer. The pulse repetition frequency was remarkably stable, having an RF linewidth of < 100 kHz.

Pavle Gavrilovic

Papers

Miniaturized self-q-switched frequency-doubled laser

High-power 390-nm laser source based on efficient frequency doubling of a tapered diode laser in an external resonant cavity.

Laser composition for preventing photo-induced damage

Solid state gain mediums for optically pumped monolithic laser

High energy CW Q-switched operation of multicontact semiconductor laser