Abstract: A dual cam phaser for an internal combustion engine, the dual cam phaser including a stator which is drivable by a crankshaft; a rotor which rotatable relative to the stator; a first camshaft; a second camshaft; and a mechanical switching element which is connected to the first camshaft and the second camshaft, wherein the first camshaft and the second camshaft are arranged coaxial with one another, wherein the first camshaft or the second camshaft is connected with the rotor to rotate together with the rotor, and wherein a phase difference between the first camshaft and the second is adjustable by the mechanical switching element.

Abstract: A dual cam phaser for an internal combustion engine, the dual cam phaser including a stator which is drivable by a crankshaft; a rotor which rotatable relative to the stator; a first camshaft; a second camshaft; and a mechanical switching element which is connected to the first camshaft and the second camshaft, wherein the first camshaft and the second camshaft are arranged coaxial with one another, wherein the first camshaft or the second camshaft is connected with the rotor to rotate together with the rotor, and wherein a phase difference between the first camshaft and the second is adjustable by the mechanical switching element.

Abstract: A mud pulser system for use in a wellbore includes a pulser assembly disposed in a drill string and through which drilling fluid is metered in order to generate pressure pulses in the drilling fluid. The pulser assembly includes a pulser body having an inlet and an exit. Included in the pulser body is a rotary member having multiple ports formed through the member. The rotary member can be spherically shaped. The ports are formed so that selectively rotating the rotary member registers opposing ends of a one of the ports with the inlet and exit in the body to provide communication between the inlet and exit. An actuator couples with the rotary member for its selective rotation.

Abstract: A mud pulser system for use in a wellbore includes a pulser assembly disposed in a drill string and through which drilling fluid is metered in order to generate pressure pulses in the drilling fluid. The pulser assembly includes a pulser body having an inlet and an exit. Included in the pulser body is a rotary member having multiple ports formed through the member. The rotary member can be spherically shaped. The ports are formed so that selectively rotating the rotary member registers opposing ends of a one of the ports with the inlet and exit in the body to provide communication between the inlet and exit. An actuator couples with the rotary member for its selective rotation.

Abstract: The invention discloses an actively Q-switched laser with an intracavity nonlinear coupler in which a stable optical frequency converted output is generated. A Gain Fluctuation Insensitivity Condition is defined and described for several examples. The nonlinear coupler with a coupling level which satisfies this Condition permits stable laser operation with minimal interaction between pulses, even when the pulses are clipped by the Q-switch. Thus, the output pulse duration and repetition frequency of the disclosed laser can be varied over a large range substantially independent of laser gain level and dynamics. Second and third harmonic optical frequency conversion is demonstrated, although the disclosed laser is applicable to other optical frequency conversion regimes as well.

Abstract: A laser apparatus is disclosed. The apparatus includes a Neodymium-doped lasing material having first and second surfaces and a passive Q-switch optically coupled to the second surface. The first-surface is substantially transparent to a pump radiation and substantially reflective to laser radiation generated by an interaction between the pump radiation and the Neodymium-doped lasing material. The laser radiation is characterized by a vacuum wavelength corresponding to an atomic transition from the 4F3/2 level to the 4I9/2 level of Neodymium in the lasing material. The second surface transmits at least a portion of the laser radiation. The lasing material and Q-switch are configured to produce pulses of the laser radiation characterized by a pulse length of greater than zero and less than about 1.5 nanoseconds and a pulse repetition rate greater than about 100 kHz. A PQSL laser, an apparatus for generating blue light and a display system based on the laser apparatus are also disclosed.

Abstract: The use of <100>-oriented crystals as gain media in lasers and optical amplifiers is disclosed. In a laser, a substantially <100>-oriented crystal, such as <100> YAG can be disposed within an optical cavity as a gain medium. The crystal is orientated such that a <100> plane is substantially perpendicular to a direction of beam propagation within the crystal. A pump source provides pumping energy to a pumped region of the crystal. The use of a substantially <100>-oriented crystal can reduce depolarization loss and thermal lens effects if an absorbed power of the pumping energy is less than or equal to about 1000 watts of pumping radiation and/or a cross-sectional overlap between a beam of radiation propagating through the crystal and the pumped region is greater than about 20% of a cross-sectional area of the pumped region.