Mitsubishi Electric Corporation

Fumio Shohda

Takayuki Yanagisawa

Kenichi Hirosawa

Kohei Sakai

Shumpei Kameyama

Yukari Takada

Kyosuke Kuramoto

Yosuke Akino

Yojiro Watanabe

Fumihiko Kannari

Included are: a first dielectric multilayer film () for transmitting a wavelength band including a wavelength of signal light () and reflecting first excitation light (), the first dielectric multilayer film () being disposed on one of two end surfaces of a core (), a first inner cladding (), a first outer cladding (), and a second outer cladding (); and a second dielectric multilayer film () for transmitting a wavelength band including the wavelength of the signal light () and reflecting the first excitation light (), the second dielectric multilayer film () being disposed on the other one of the two end surfaces.

Planar waveguide and laser amplifier

In a plane perpendicular to the optical axis () of a lens (), the direction in which the cylindrical surface has zero curvature is the direction of generatrix of the lens (), and the direction in which the cylindrical surface has non-zero curvature and that is orthogonal to the direction of generatrix is the direction of curvature of the lens (). A light source () is disposed at the focal position () in the direction of generatrix on the side of the incident surface () of the lens (), and emits light toward the incident surface () of the lens (), the light having a difference between the divergence angle in the direction of generatrix of the lens () and the divergence angle in the direction of curvature of the lens ().

Parallel light generation device

A lens () has an incidence surface () having a cylindrical shape and forming a concave shape, and an emitting surface () forming a convex shape with respect to an optical axis (). A light source () has a large divergence angle in a vertical direction, and a divergence angle in a horizontal direction which is smaller than that in the vertical direction. The light source () is located at a position of focal length of the lens () in the vertical direction on a side of the incidence surface. The horizontal direction of the light source () is aligned with a curvature direction of the cylindrical shape of the lens ().

Collimated light generating apparatus

In a planar waveguide laser device (), a substrate () is joined to the upper surface of a waveguide (). A recess () having a chamfered shape is formed along an edge of an end facet of the substrate () on the side of the waveguide (), the end facet being perpendicular to the direction of laser oscillation. An end facet of the waveguide () perpendicular to the oscillation direction of laser light is covered with a coating (). A wraparound portion () continuing from the coating () covers the upper surface of the waveguide () facing the recess () of the substrate ().

Planar waveguide laser device

A device includes: at least one laser element with light emitting points to output fundamental waves in a one-dimensional array; a wavelength converting element to carry out wavelength conversion of the incident fundamental waves, and to output wavelength converted light rays; and an output mirror to reflect the fundamental waves, and to transmit the wavelength converted light rays resulting from the wavelength conversion by the wavelength converting element. The wavelength converting element is disposed between the laser element and the output mirror, and the distance between the position of a waist of the fundamental waves output from the laser element and the output mirror is set in accordance with a Talbot condition under which the adjacent light emitting points cause phase synchronization with each other.

Array type wavelength converting laser device

A laser includes a wavelength selecting elementthat selectively reflects laser beams with wavelengths &#x3bb;=&#x3bb;, &#x3bb;, &#x3bb;, . . . , &#x3bb;(n&#x2267;1) of different laser oscillation modes from among fundamental oscillation wavelengths of laser beams passing through a wavelength conversion element, and the wavelength conversion elementthat converts the laser beams with the wavelengths &#x3bb;=&#x3bb;, &#x3bb;, &#x3bb;, . . . , &#x3bb;(n&#x2267;1) of different laser oscillation modes reflected by the wavelength selecting elementto harmonics. When using a material with a wide gain band as a laser mediumof a solid-state laser element, a waveguide laser is implemented capable of carrying out high-efficiency wavelength conversion at a plurality of wavelengths within the gain band.

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Tokyo, Japan

Fumio Shohda