A light emission device includes a light source that emits an excitation light beam, a light deflector, a wavelength converter that receives and converts the excitation light beam deflected by the light deflector to wavelength-converted light, and a light concentration section that focuses the excitation light beam on the wavelength converter. The light concentration section includes a first optical system disposed between the light source and the light deflector, and a second optical system disposed between the light deflector and the wavelength converter. In the second optical system, a focal length of an Ay-axis is shorter than a focal length of an Ax-axis, where the Ax-axis is defined as an axis that has a lowest beam parameter product of the excitation light beam, and the Ay-axis is defined as an axis orthogonal to the Ax-axis in a cross section perpendicular to a propagation direction of the excitation light beam.

A light emission device includes a light source that emits an excitation light beam, a light deflector, a wavelength converter that receives and converts the excitation light beam deflected by the light deflector to wavelength-converted light, and a light concentration section that focuses the excitation light beam on the wavelength converter. The light concentration section includes a first optical system disposed between the light source and the light deflector, and a second optical system disposed between the light deflector and the wavelength converter. In the second optical system, a focal length of an Ay-axis is shorter than a focal length of an Ax-axis, where the Ax-axis is defined as an axis that has a lowest beam parameter product of the excitation light beam, and the Ay-axis is defined as an axis orthogonal to the Ax-axis in a cross section perpendicular to a propagation direction of the excitation light beam.

A light source device includes: an excitation light source that emits excitation light having an energy density of 10 W/mm.sup.2 or more; and a phosphor layer that has phosphor particles embedded in the matrix. The phosphor particles include at least one selected from the group consisting of metal oxides represented by a following formula (1) and metal oxides represented by a following formula (2).
Y.sub.3-x1-y1R.sup.1.sub.y1Ce.sub.x1Al.sub.5-z1Ga.sub.z1O.sub.12  (1)
Y.sub.3-x2-y2R.sup.2.sub.y2Ce.sub.x2Al.sub.5-z2Sc.sub.z2O.sub.12  (2) In the formula (1), R.sup.1 includes at least one selected from the group consisting of Gd and Tb, and x.sub.1, y.sub.1, and z.sub.1 satisfy 0.003≤x.sub.1≤0.03, 0≤y.sub.1≤2.1, and 0≤z.sub.1≤2.2, respectively. In the formula (2), R.sup.2 includes at least one selected from the group consisting of Gd and Tb, and x.sub.2, y.sub.2, and z.sub.2 satisfy 0.003≤x.sub.2≤0.03, 0≤y.sub.2≤2.1 and 0≤z.sub.2≤1.5, respectively.

A light source device includes: an excitation light source that emits excitation light having an energy density of 10 W/mm.sup.2 or more; and a phosphor layer that has phosphor particles embedded in the matrix. The phosphor particles include at least one selected from the group consisting of metal oxides represented by a following formula (1) and metal oxides represented by a following formula (2).
Y.sub.3-x1-y1R.sup.1.sub.y1Ce.sub.x1Al.sub.5-z1Ga.sub.z1O.sub.12  (1)
Y.sub.3-x2-y2R.sup.2.sub.y2Ce.sub.x2Al.sub.5-z2Sc.sub.z2O.sub.12  (2) In the formula (1), R.sup.1 includes at least one selected from the group consisting of Gd and Tb, and x.sub.1, y.sub.1, and z.sub.1 satisfy 0.003≤x.sub.1≤0.03, 0≤y.sub.1≤2.1, and 0≤z.sub.1≤2.2, respectively. In the formula (2), R.sup.2 includes at least one selected from the group consisting of Gd and Tb, and x.sub.2, y.sub.2, and z.sub.2 satisfy 0.003≤x.sub.2≤0.03, 0≤y.sub.2≤2.1 and 0≤z.sub.2≤1.5, respectively.

A light source device includes: an excitation light source that emits excitation light having an energy density of 10 W/mm.sup.2 or more; and a phosphor layer that has phosphor particles embedded in the matrix. The phosphor particles include at least one selected from the group consisting of metal oxides represented by a following formula (1) and metal oxides represented by a following formula (2).

Y.sub.3-x1-y1R.sup.1.sub.y1Ce.sub.x1Al.sub.5-z1Ga.sub.z1O.sub.12  (1)

Y.sub.3-x2-y2R.sup.2.sub.y2Ce.sub.x2Al.sub.5-z2Sc.sub.z2O.sub.12  (2)

In the formula (1), R.sup.1 includes at least one selected from the group consisting of Gd and Tb, and x.sub.1, y.sub.1, and z.sub.1 satisfy 0.003≤x.sub.1≤0.03, 0≤y.sub.1≤2.1, and 0≤z.sub.1≤2.2, respectively. In the formula (2), R.sup.2 includes at least one selected from the group consisting of Gd and Tb, and x.sub.2, y.sub.2, and z.sub.2 satisfy 0.003≤x.sub.2≤0.03, 0≤y.sub.2≤2.1 and 0≤z.sub.2≤1.5, respectively.

A light source device includes: an excitation light source that emits excitation light having an energy density of 10 W/mm.sup.2 or more; and a phosphor layer that has phosphor particles embedded in the matrix. The phosphor particles include at least one selected from the group consisting of metal oxides represented by a following formula (1) and metal oxides represented by a following formula (2).

Y.sub.3-x1-y1R.sup.1.sub.y1Ce.sub.x1Al.sub.5-z1Ga.sub.z1O.sub.12  (1)

Y.sub.3-x2-y2R.sup.2.sub.y2Ce.sub.x2Al.sub.5-z2Sc.sub.z2O.sub.12  (2)

In the formula (1), R.sup.1 includes at least one selected from the group consisting of Gd and Tb, and x.sub.1, y.sub.1, and z.sub.1 satisfy 0.003≤x.sub.1≤0.03, 0≤y.sub.1≤2.1, and 0≤z.sub.1≤2.2, respectively. In the formula (2), R.sup.2 includes at least one selected from the group consisting of Gd and Tb, and x.sub.2, y.sub.2, and z.sub.2 satisfy 0.003≤x.sub.2≤0.03, 0≤y.sub.2≤2.1 and 0≤z.sub.2≤1.5, respectively.

An illumination apparatus is provided that includes a yellow phosphor converter to receive a blue laser light beam and to convert a portion of the blue laser light beam to yellow light, a dichroic mirror optically coupled to the yellow phosphor converter to receive the phosphor-emitted light beam and to filter the phosphor-emitted light beam to provide a dichroic-filtered light beam, the dichroic mirror configured to pass yellow light and to reflect at least some blue light, and a blue light source optically coupled to the dichroic mirror to provide a blue light beam, the dichroic mirror configured to reflect the blue light beam in a same direction as the dichroic-filtered light beam.

An illumination apparatus is provided that includes a yellow phosphor converter to receive a blue laser light beam and to convert a portion of the blue laser light beam to yellow light, a dichroic mirror optically coupled to the yellow phosphor converter to receive the phosphor-emitted light beam and to filter the phosphor-emitted light beam to provide a dichroic-filtered light beam, the dichroic mirror configured to pass yellow light and to reflect at least some blue light, and a blue light source optically coupled to the dichroic mirror to provide a blue light beam, the dichroic mirror configured to reflect the blue light beam in a same direction as the dichroic-filtered light beam.

A light emission device includes a light source that emits an excitation light beam, a light deflector, a wavelength converter that receives and converts the excitation light beam deflected by the light deflector to wavelength-converted light, and a light concentration section that focuses the excitation light beam on the wavelength converter. The light concentration section includes a first optical system disposed between the light source and the light deflector, and a second optical system disposed between the light deflector and the wavelength converter. In the second optical system, a focal length of an Ay-axis is shorter than a focal length of an Ax-axis, where the Ax-axis is defined as an axis that has a lowest beam parameter product of the excitation light beam, and the Ay-axis is defined as an axis orthogonal to the Ax-axis in a cross section perpendicular to a propagation direction of the excitation light beam.

A light emission device includes a light source that emits an excitation light beam, a light deflector, a wavelength converter that receives and converts the excitation light beam deflected by the light deflector to wavelength-converted light, and a light concentration section that focuses the excitation light beam on the wavelength converter. The light concentration section includes a first optical system disposed between the light source and the light deflector, and a second optical system disposed between the light deflector and the wavelength converter. In the second optical system, a focal length of an Ay-axis is shorter than a focal length of an Ax-axis, where the Ax-axis is defined as an axis that has a lowest beam parameter product of the excitation light beam, and the Ay-axis is defined as an axis orthogonal to the Ax-axis in a cross section perpendicular to a propagation direction of the excitation light beam.