Josh P Foster, 544 Indigo Run Dr APT 423, Hilton Head Island, SC 29926

6348358, Feb 19, 2002

Jan 18, 2000

09/484992

John Gary Sousa - Hudson NH
Josh P. Foster - Windham NH
Thomas C. Dearman - Oro Valley AZ

Presstek, Inc. - Hudson NH

H01L 2100

438 22, 438 26, 438 33, 438456

A linear array of diode laser emitters is manufactured with sufficient thermal and electronic isolation among the emitters to permit separate addressability. The emitter bar has first and second opposed surfaces and a third surface through which the emitters direct output. A first surface of the emitter bar is affixed to a âstandoffâ element that has conductive surfaces connecting each emitter to a power source; these connections are maintained after a series of spaces is formed between the emitters of the emitter bar. The second surface of the emitter bar is affixed to a heat sink to form a finished assembly.

5822345, Oct 13, 1998

Jul 8, 1996

8/676470

John G. Sousa - Hudson NH
Josh Foster - Nashua NH
Wayne Mueller - Londonderry NH

Presstek, Inc. - Hudson NH

H01S 310

372 38

A laser system for imaging graphic-arts constructions avoids the need to demagnify a divergent beam by using the output of a semiconductor or diode laser to optically pump a laser crystal, which itself emits laser radiation with substantially less beam divergence. A preferred implementation utilizes, as a pumping source, at least one laser device that emits in the IR, and preferably near-IR region, to image ablative or transfer-type printing members. The output of the pumping source is provided to the laser crystal via a focusing lens arrangement. The output of the laser crystal, in turn, is focused onto the surface of a recording medium to perform the imaging function. Crystal excitation and decay times are minimized by continuously maintaining the pumping source at a bias power level, which keeps the crystal at a continuous, baseline power level just short of lasing or imaging; and then selectively and intermittently increasing power to the pumping source to cause the crystal to lase (or lase at higher power) in an imagewise pattern. By selectively varying the pulse width within certain limits, it is possible to obtain image dots of different sizes while retaining a round dot shape.

6222870, Apr 24, 2001

Jun 16, 1999

9/334486

John Gary Sousa - Hudson NH
Josh P. Foster - Windham NH

Presstek, Inc. - Hudson NH

H01S 300

372 75

Individually addressable laser crystals are optically coupled to a single slab of an optical carrier that transmits substantially without distortion. The crystals are separate for thermomechanical isolation but may be closely spaced (generally on the order of 0. 003 inch apart), and may originate as a single crystal cut into separate segments.

5764274, Jun 9, 1998

Feb 16, 1996

8/602881

John G. Sousa - Hudson NH
Richard A. Williams - Hampstead NH
Mitchell C. Ruda - Tucson AZ
Josh Foster - Nashua NH

Presstek, Inc. - Hudson NH

B41J 2385

347258

A focusing assembly includes features that allow numerical aperture to be reduced and optimized by reducing aberrations and ghost reflections and easily controlling stop size, thereby increasing depth-of-focus. The assembly includes a single, bi-aspheric focusing lens that optimizes image quality at a specific off-axis field point. Passage of excessively divergent radiation is prevented by a baffle having a sharp, flared edge that minimizes reflection. A second aperture or baffle can be included to restrict high-divergence radiation emerging from the bi-aspheric focusing lens. All interior surfaces of the focusing assembly are preferably blackened, once again to minimize internal reflections.

5990925, Nov 23, 1999

Nov 7, 1997

8/966492

John G. Sousa - Hudson NH
Josh Foster - Nashua NH
James R. Moss - Altamonte Springs FL

Presstek, Inc. - Hudson NH

H01S 3091

347256

Pumped laser crystals for use in an imaging apparatus are designed and housed so as to minimize variation in dot size across the spectrum of duty cycles ranging generally from 1% to 100%--that is, from print densities ranging from every hundredth pixel to every consecutive pixel.