John J. Zayhowski

Learn More
M.I.T. Lincoln Laboratory is actively developing laser and detector technologies that make it possible to build a three-dimensional laser radar (3-D ladar) with several attractive features, including capture of an entire 3-D image on a single laser pulse, tens of thousands of pixels, few-centimeter range resolution, and small size, weight, and power(More)
351 L     three-dimensional (3D) laser radars (ladars) with attractive features that include capture of an entire 3D image with a single laser pulse, image resolution of tens of thousands of pixels, range resolution of a few centimeters, and small size. The laser technology for the ladar is based on diode-pumped solid-state(More)
Passively Q-switched 1.064-microm microchip lasers have been constructed from thin pieces of Nd(3+):YAG bonded to thin pieces of Cr(4+):YAG. When pumped with the unfocused 1.2-W output of a fiber-coupled diode, these devices produced 11-microJ pulses of 337-ps duration at a pulse repetition rate of 6 kHz in a single-frequency TEM(00) mode. The peak power of(More)
We have developed a threedimensional imaging laser radar featuring 3-cm range resolution and single-photon sensitivity. This prototype direct-detection laser radar employs compact, all-solid-state technology for the laser and detector array. The source is a Nd:YAG microchip laser that is diode pumped, passively Q-switched, and frequency doubled. The(More)
Optically pumped, single-frequency, Nd-doped, solid-state lasers have been constructed using flat-flat cavities, which were diced from large dielectrically coated wafers of various crystals. For example, a Nd:YAG laser with a cavity length of 730 microm has operated at room temperature in a single longitudinal mode from a threshold of less than 1 mW to(More)
High-power passively Q-switched microchip lasers produce 157-muJ pulses of 1-ns duration in a single-frequency, diffraction-limited output beam. The unfocused 1.064-mum output of these devices has been used to drive periodically poled lithium niobate optical parametric amplifiers at wavelengths between 1.4 and 4.3 mum . With a peak conversion efficiency of(More)
We have demonstrated an efficient, compact, passively Q-switched single-mode diode-pumped Nd:YAG laser that uses Cr(4+):YAG as a saturable absorber. Linear- and ring-cavity configurations were demonstrated. Pulse energies and widths were, respectively, 1.5mJ and 3.9ns for the linear cavity and 2.1mJ and 12ns for the ring cavity.
III Lincoln Laboratory has developed tunable, single-frequency microchip lasers fabricated from Nd-doped solid state crystals. Diode-laser-pumped Nd:YAG microchip lasers have linewidths ofless than 7 kHz at center frequencies of 1.064 and 1.319 J.1m, and have operated in a single-frequency, single-polarization, fimdamental transverse mode at output powers(More)