Wavelength conversion laser, image display device and laser processing device
AssigneePanasonic Corporation
InventorsTetsuro Mizushima, Hiroyuki Furuya, Shinichi Shikii, Koichi Kusukame, Nobuyuki Horikawa, Kiminori Mizuuchi, Kazuhisa Yamamoto
Life of this patent
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Abstract
A wavelength conversion laser is provided with a pair of fundamental wave reflecting surfaces for reflecting a fundamental wave to define a plurality of fundamental wave paths passing a wavelength conversion element at different angles, and a control unit for controlling wavelength conversion efficiencies so that the wavelength conversion efficiency on a specific one of the plurality of fundamental wave paths extending in different directions between the pair of fundamental wave reflecting surfaces is highest.
Claims11
A wavelength conversion laser, comprising:
- a fundamental wave light source for emitting a fundamental wave;
- a wavelength conversion element for converting the fundamental wave from the fundamental wave light source into a converted wave, the wavelength conversion element having a periodically polarization-reversed structure;
- a pair of fundamental wave reflecting surfaces for reflecting the fundamental wave to define a plurality of fundamental wave paths passing the periodically polarization-reversed structure of the wavelength conversion element at different angles;
- and
- a control unit for controlling wavelength conversion efficiencies so that a wavelength conversion efficiency on a specific one of the plurality of fundamental wave paths between the pair of fundamental wave reflecting surfaces is highest,
- wherein at least one of the pair of fundamental wave reflecting surfaces serves as an output surface for transmitting the converted wave.
An image display device, comprising:
- a wavelength conversion laser including
- a fundamental wave light source for emitting a fundamental wave,
- a wavelength conversion element for converting the fundamental wave from the fundamental wave light source into a converted wave, the wavelength conversion element having a periodically polarization-reversed structure,
- a pair of fundamental wave reflecting surfaces for reflecting the fundamental wave to define a plurality of fundamental wave paths passing the periodically polarization-reversed structure of the wavelength conversion element at different angles, wherein at least one of the pair of fundamental wave reflecting surfaces serves as an output surface for transmitting the converted wave, and
- a control unit for controlling wavelength conversion efficiencies so that a wavelength conversion efficiency on a specific one of the plurality of fundamental wave paths between the pair of fundamental wave reflecting surfaces is highest;
- and
- a modulation element for modulating the converted wave emitted from the wavelength conversion laser to display a specified image.
A laser processing device, comprising:
- a wavelength conversion laser including
- a fundamental wave light source for emitting a fundamental wave,
- a wavelength conversion element for converting the fundamental wave from the fundamental wave light source into a converted wave, the wavelength conversion element having a periodically polarization-reversed structure,
- a pair of fundamental wave reflecting surfaces for reflecting the fundamental wave to define a plurality of fundamental wave paths passing the periodically polarization-reversed structure of the wavelength conversion element at different angles, wherein at least one of the pair of fundamental wave reflecting surfaces serves as an output surface for transmitting the converted wave, and
- a control unit for controlling wavelength conversion efficiencies so that a wavelength conversion efficiency on a specific one of the plurality of fundamental wave paths between the pair of fundamental wave reflecting surfaces is highest;
- and
- a condensing optical element for condensing the converted wave emitted from the wavelength conversion laser,
- wherein a spot shape of the converted wave is changed by increasing or decreasing a number of optical paths for emitting converted waves out of the respective fundamental wave paths.
Dependencies are inferred from the claim text.