Abstract: A tunable laser source has a first laser source to generate a low power continuous wave laser light having a wavelength ?1. A second laser source generates a low power continuous wave laser light having a wavelength ?2. A pump laser source generates a high power pulsed laser light having a wavelength ?0. A first optical parametric amplifier (OPA) receives the laser light having a wavelength ?1 and the laser light having a wavelength ?0 and generates a high power pulsed laser light having a wavelength ?1. A second optical parametric amplifier (OPA) receives the laser light having a wavelength ?2 and the laser light having a wavelength ?0 to and generates a high power pulsed laser light having a wavelength ?2. A difference frequency generator (DFG), receives the high power pulsed laser light having a wavelength ?1 and the high power pulsed laser light having a wavelength ?2 and provides a high power pulsed laser light having a wavelength ?3 wherein ?3=?1*?2/(?2??1).

Abstract: A target gas sensing system includes a single source at a first location for generating two light beams having first and second frequencies wherein the difference between the first and second frequencies is the Raman frequency of the target gas. A difference frequency generator outputs the two light beams having the first frequency, the second frequency, and a third light beam having a third frequency that is the difference between the first and second frequencies. The first, second, and third light beams are directed toward the target gas. An input optic directs light from the third light beam, after interacting with the target gas, to a receiver for absorption spectroscopy processing, directs a fourth light beam from the target gas to a receiver for coherent anti-Stokes Raman processing, wherein the fourth light beam has a frequency of twice the first frequency minus the second frequency.

Abstract: A tunable laser source has a first laser source to generate a low power continuous wave laser light having a wavelength ?1. A second laser source generates a low power continuous wave laser light having a wavelength ?2. A pump laser source generates a high power pulsed laser light having a wavelength ?0. A first optical parametric amplifier (OPA) receives the laser light having a wavelength ?1 and the laser light having a wavelength ?0 and generates a high power pulsed laser light having a wavelength ?1. A second optical parametric amplifier (OPA) receives the laser light having a wavelength ?2 and the laser light having a wavelength ?0 to and generates a high power pulsed laser light having a wavelength ?2. A difference frequency generator (DFG), receives the high power pulsed laser light having a wavelength ?1 and the high power pulsed laser light having a wavelength ?2 and provides a high power pulsed laser light having a wavelength ?3 wherein ?3=?1*?2/(?2??1).

Abstract: A target gas sensing system includes a single source at a first location for generating two light beams having first and second frequencies wherein the difference between the first and second frequencies is the Raman frequency of the target gas. A difference frequency generator outputs the two light beams having the first frequency, the second frequency, and a third light beam having a third frequency that is the difference between the first and second frequencies. The first, second, and third light beams are directed toward the target gas. An input optic directs light from the third light beam, after interacting with the target gas, to a receiver for absorption spectroscopy processing, directs a fourth light beam from the target gas to a receiver for coherent anti-Stokes Raman processing, wherein the fourth light beam has a frequency of twice the first frequency minus the second frequency.

Abstract: A multiple path light source has a first and second laser source that generate low power continuous wave laser beam at wavelength ?1 and ?2 respectively. A pump laser source generates a high power pulsed narrow linewidth laser beam at wavelength ?0. A first pair of DFGs convert the low power continuous laser beams at ?1 and ?2 to high peak power pulsed laser beams at wavelengths ?1 and ?2, and generate pulsed laser beams at wavelength ?1DFG=?1*?0/(?1??0) and ?2DFG=?2*?0/(?2??0). A second pair of DFGs receives the high peak power pulsed laser beams at ?1 and ?2 and the pulsed laser beams at ?1DFG and ?2DFG and generates laser beams at wavelength ?3=?1*?2/(?2??1) and ?3DFG=?1DFG*?2DFG/(?2DFG??1DFG). A beam splitter combines the high power pulsed laser beam at wavelength ?3 with the high power pulsed laser beam at wavelength ?3DFG to form a single laser light.

Abstract: An automotive rear view mirror system comprises passive optical elements (which may include lenses, but must include one or an odd number of mirrors) configured to provide a wide field of view with a negative optical element having a small width dimension mounted externally and close to the body of the vehicle. In a basic embodiment, a small negative optical element, such as a convex mirror, is mounted outside the vehicle, and a larger positive optical element, such as a convex lens, is placed inside the vehicle. The optical elements are positioned to be substantially confocal, with the distance between them equal to the difference in their focal lengths, so as to cancel the curvature of field generated by the external element. The internal element magnifies the image to a size comparable to that obtained with a standard external flat mirror.

Abstract: A photorefractive device is provided for converting an image-bearing incoherent input beam to a high contrast coherent output beam the intensity of which varies as the square of the input intensity pattern. The device uses an incoherent image beam to write a holographic grating directly in a photorefractive medium. In one embodiment, a parallel, laterally displaced, telecentric system of lenses is used to split a quasi-monochromatic, incoherent image-bearing beam into two equal components. The two components are superimposed at the surface of the photorefractive medium to produce the hologram. In a second embodiment, the incoherent input beam is directed through a physically translating external grating to write the hologram in the photorefractive medium. The moving grating improves the diffraction efficiency of the hologram under the influence of an applied electric field and stabilizes the temporal response characteristics for signal processing.