Abstract: A method for directing a laser pulsed beam towards a selected area/surface of an object, comprising transmitting from a laser assembly that includes an optical transmitter module a pulsed laser beam having a first pulse duration and illuminating therewith an area/surface of the object, thereby obtaining a reflected pulsed laser beam, the reflected pulsed laser beam including a leading portion reflected from a first reflecting area/surface of the object which is the area of the object that defines the shortest optical path between the optical transmitter module, the object and an optical receiver module; receiving, in a second laser assembly that includes the optical receiver module, the reflected pulsed laser beam and converting it into an amplified phase conjugated pulsed beam of a second pulse duration, and transmitting from the second laser assembly the amplified phase conjugated pulsed beam and illuminating therewith on selected area/surface of the object.

Abstract: A method for directing a laser pulsed beam towards a selected area/surface of an object, comprising transmitting from a laser assembly that includes an optical transmitter module a pulsed laser beam having a first pulse duration and illuminating therewith an area/surface of the object, thereby obtaining a reflected pulsed laser beam, the reflected pulsed laser beam including a leading portion reflected from a first reflecting area/surface of the object which is the area of the object that defines the shortest optical path between the optical transmitter module, the object and an optical receiver module; receiving, in a second laser assembly that includes the optical receiver module, the reflected pulsed laser beam and converting it into an amplified phase conjugated pulsed beam of a second pulse duration, and transmitting from the second laser assembly the amplified phase conjugated pulsed beam and illuminating therewith on selected area/surface of the object.

Abstract: A device for non contact detection of low concentration substances outside a laboratory environment is disclosed. A probing laser emission is split into two linear orthogonally polarized emission components and one component is delayed in time relative to the other. Both components are directed to a focal region that is proximate to a target medium thought to contain the substance to be detected. Between the arrival of the first and second emission components, an excitation light pulse at a wavelength corresponding to an absorption line in the spectrum of the substance is directed to the focal region. If vapours of the substance are present, they will be heated by the excitation pulse and will change the index of refraction of the focal region before the second emission component passes through it, thus altering the phase of the back-scattered emission returns. The device delays the first returned component by an equal delay and coherently couples the returned emission components.

Abstract: A method is disclosed for establishing communication through free space between a pair of optical communication devices. A divergent beam is transmitted from each of the optical communication devices toward the other. A portion of the received divergent beam is used to create a phase conjugated beam that is returned to the other device. A diffraction grating is dynamically recorded at each devices so as to establish a bi-directional self-tracking optical link between the devices.

Abstract: A method and system are described for viewing markings in a piece of jewelry or other object. The piece of jewelry or object comprises a medium that includes markings, and a lens positioned relative to the medium to allow the lens to magnify the markings for viewing.

Abstract: A multiple stage laser system that produces coherent light in the ultraviolet range using phase conjugated Stimulated Raman Scattering and harmonic generation. The system uses a pump laser producing an input beam that is frequency shifted via phase conjugating Stimulated Raman Scattering. The Raman shifted beam is passed through a harmonic generation stage that produces the desired output beam by generating the required harmonic of the Raman shifted beam.