Laser light source and display device

A laser light source comprising:

• plural semiconductor lasers;
• a solid laser medium;
• a wavelength conversion element;
• a first reflection layer formed on one facet of the solid laser medium;
• and
• a second reflection layer formed on one facet of the wavelength conversion element, wherein
• the solid laser medium and the wavelength conversion element are disposed between the first reflection layer and the second reflection layer;
• the first reflection layer and the second reflection layer form a laser resonator having both reflection end facets approximately parallel to each other;
• plural pump parts of the solid laser medium are pumped by the plural semiconductor lasers;
• the plural pump parts are separated from each other by 300 μm or more;
• the solid laser medium comprises plural solid lasers having different compositions or materials;
• the wavelength conversion element has plural parts having different phase matches;
• and
• the solid lasers generate laser lights of different wavelengths for the respective pump parts.

A laser light source comprising:

• three or more semiconductor lasers;
• a solid laser medium;
• a wavelength conversion element;
• a first reflection layer formed on one facet of the solid laser medium;
• and
• a second reflection layer formed on one facet of the wavelength conversion element, wherein
• the solid laser medium and the wavelength conversion element are disposed between the first reflection layer and the second reflection layer;
• the first reflection layer and the second reflection layer form a laser resonator having both reflection end facets approximately parallel to each other;
• three or more pump parts of the solid laser medium are pumped by the three or more semiconductor lasers;
• the three or more pump parts are arranged so as not to be positioned on the same straight line;
• the solid laser medium comprises plural solid lasers having different compositions or materials;
• the wavelength conversion element has plural parts having different phase matches;
• and
• the solid lasers generate laser lights of different wavelengths for the respective pump parts.

A laser light source comprising:

• plural semiconductor lasers;
• a solid laser medium;
• a wavelength conversion element;
• a first reflection layer formed on one facet of the solid laser medium;
• and
• a second reflection layer formed on one facet of the wavelength conversion element, wherein
• the solid laser medium and the wavelength conversion element are disposed between the first reflection layer and the second reflection layer;
• the first reflection layer and the second reflection layer form a laser resonator having both reflection end facets approximately parallel to each other;
• plural pump parts of the solid laser medium are pumped by the plural semiconductor lasers;
• the plural pump parts are separated from each other by a heat separation mechanism;
• the solid laser medium comprises plural solid lasers having different compositions or materials;
• the wavelength conversion element has plural parts having different phase matches;
• and
• the solid lasers generate laser lights of different wavelengths for the respective pump parts.

A laser light source comprising:

• plural semiconductor lasers;
• a solid laser medium;
• a wavelength conversion element;
• a first reflection layer formed on one facet of the solid laser medium;
• and
• a second reflection layer formed on one facet of the wavelength conversion element, wherein
• the solid laser medium and the wavelength conversion element are disposed between the first reflection layer and the second reflection layer;
• the first reflection layer and the second reflection layer form a laser resonator having both reflection end facets approximately parallel to each other;
• plural pump parts of the solid laser medium are pumped by the plural semiconductor lasers;
• the plural pump parts are separated from each other by 300 μm or more;
• the solid laser medium comprises a ceramic material;
• at least one of the plural pump parts in the solid laser medium has a composition or a material different from those of other pump parts;
• the wavelength conversion element has plural parts having different phase matches;
• and
• the solid lasers generate laser lights of different wavelengths for the respective pump parts.

A laser light source comprising:

• three or more semiconductor lasers;
• a solid laser medium;
• a wavelength conversion element;
• a first reflection layer formed on one facet of the solid laser medium;
• and
• a second reflection layer formed on one facet of the wavelength conversion element, wherein
• the solid laser medium and the wavelength conversion element are disposed between the first reflection layer and the second reflection layer;
• the first reflection layer and the second reflection layer form a laser resonator having both reflection end facets approximately parallel to each other;
• three or more pump parts of the solid laser medium are pumped by the three or more semiconductor lasers;
• the three or more pump parts are arranged so as not to be positioned on the same straight line;
• the solid laser medium comprises a ceramic material;
• at least one of the plural pump parts in the solid laser medium has a composition or a material different from those of other pump parts;
• the wavelength conversion element has plural parts having different phase matches;
• and
• the solid lasers generate laser lights of different wavelengths for the respective pump parts.

A laser light source comprising:

• plural semiconductor lasers;
• a solid laser medium;
• a wavelength conversion element;
• a first reflection layer formed on one facet of the solid laser medium;
• and
• a second reflection layer formed on one facet of the wavelength conversion element, wherein
• the solid laser medium and the wavelength conversion element are disposed between the first reflection layer and the second reflection layer;
• the first reflection layer and the second reflection layer form a laser resonator having both reflection end facets approximately parallel to each other;
• plural pump parts of the solid laser medium are pumped by the plural semiconductor lasers;
• the plural pump parts are separated from each other by a heat separation mechanism;
• the solid laser medium comprises a ceramic material;
• at least one of the plural pump parts in the solid laser medium has a composition or a material different from those of other pump parts;
• the wavelength conversion element has plural parts having different phase matches;
• and
• the solid lasers generate laser lights of different wavelengths for the respective pump parts.

A laser light source comprising:

• a pump light source;
• a solid laser medium;
• and
• a wavelength conversion element, wherein
• the solid laser medium are pumped by the pump light source to generate plural laser lights;
• the wavelength conversion element has plural wavelength conversion parts;
• the plural laser lights are converted into shorter-wavelength lights by the different wavelength conversion parts of the wavelength conversion element;
• the wavelength conversion parts are separated from each other by 100 μm or more;
• the wavelength conversion element is a non-linear optical crystal;
• the non-linear optical crystal is LiNbO3 containing any of Mg, Zn, In, and Sc and having a periodic polarization inversion structure;
• and
• a length of a resonator including the laser medium and the non-linear optical crystal is 2 mm or less.