1. A wavelength conversion laser light source, comprising:
a laser medium configured to generate fundamental wave light;
a laser resonator configured to cause laser oscillation of the fundamental wave light;
a wavelength convertor including a wavelength converting region to convert the fundamental wave light under the laser oscillation by means of the laser resonator into converted light of a different wavelength; and
an excitation laser light source configured to excite the laser medium, wherein the laser resonator includes at least one reflecting surface which reflects the fundamental wave light, and a first reflecting element which is provided on an end surface of the wavelength convertor to reflect the fundamental wave light;
the wavelength converting region is situated between the at least one reflecting surface and the first reflecting element;
the wavelength convertor includes a periodic first polarization reversal structure formed in the wavelength converting region, and a non-converting region formed between the first reflecting element and the wavelength converting region; and
the non-converting region does not convert the fundamental wave light into the converted light.
2. The wavelength conversion laser light source according to claim 1, wherein
the first polarization reversal structure includes a first polarization reversal period of \u039b \u03bcm;
the non-converting region has a length of d1 \u03bcm; and
the first polarization reversal period and the length of the non-converting region satisfy a relationship defined by \u039b\u2266d1\u22662000 \u03bcm.
3. The wavelength conversion laser light source according to claim 1, wherein
the wavelength convertor converts the fundamental wave light into second harmonic light having a wavelength width of \u0394\u03bbs as the converted light; and
a length of the non-converting region which is single-polarized satisfies a relationship defined by \u039b\u2266d1\u226640 \u03bcm\u0394\u03bbs.
4. The wavelength conversion laser light source according to claim 1, wherein the non-converting region includes a periodic second polarization reversal structure;
a second polarization reversal period of the second polarization reversal structure corresponds to 12n times as long as a first polarization reversal period of the first polarization reversal structure (where n is a natural number); and
a length of the non-converting region satisfies a relationship defined by 2 n\u039b\u2266d1\u22662000 \u03bcm.
5. The wavelength conversion laser light source according to claim 1, wherein
the end surface includes an emission end surface from which the converted light is emitted;
the first reflecting element provided on the emission end surface includes a first reflecting film which reflects the fundamental wave light; and
the non-converting region includes a first non-converting region which forms the emission end surface.
6. The wavelength conversion laser light source according to claim 5, wherein
the end surface includes an incident end surface on which the fundamental wave light is incident;
the first reflecting element provided on the incident end surface includes a second reflecting film which reflects the converted light;
the non-converting region includes a second non-converting region which forms the incident end surface;
the fundamental wave light has a wavelength width of \u0394\u03bbf;
the second non-converting region has a length of d2; and
the wavelength width of the fundamental wave light and the length of the second converting region satisfy a relationship defined by 0.2 mm\u0394\u03bbf\u2266d2\u22660.3 mm\u0394\u03bbf.
7. The wavelength conversion laser light source according to claim 1, wherein
the laser medium includes a first emission end surface from which the fundamental wave light is emitted and a second reflecting element provided on the first emission end surface;
the second reflecting element reflects the converted light;
the end surface includes a second emission end surface from which the converted light is emitted;
the first end surface is inclined at an angle of \u03b8 with respect to the second emission end surface; and
the angle of the first emission end surface with respect to the second emission end surface satisfies a relationship defined by 0.1\xb0\u2266\u03b8\u226670\xb0.
8. The wavelength conversion laser light source according to claim 7, wherein
the resonator has a refractive index of n1;
the laser medium has a refractive index of n2; and
the angle of the first emission end surface with respect to the second emission end surface satisfies a relationship defined by 0.964\xd7arctan(n2n1)\u2266\u03b8\u22661.04\xd7arctan(n2n1).
9. An image forming apparatus, comprising:
a laser light source configured to emit laser light of at least one hue of red, green and blue;
a spatial light modulator configured to modulate the laser light emitted from the laser light source; and
an optical system configured to guide the laser light emitted from the laser light source to the spatial light modulator, wherein
the laser light source includes the wavelength conversion laser light source according to claim 1.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A game apparatus which displays letters as visual support for a sound generated by a message generating object by use of a billboard, comprising:
a distance calculating means for calculating a distance between said message generating object and a player object; and
a form changing means for changing a form of a texture of said letters to be pasted on said billboard depending upon said distance calculated by said distance calculating means.
2. A game apparatus according to claim 1, wherein said form changing means changes transparency of said texture of said letters.
3. A game apparatus according to claim 2, wherein said form changing means increases the transparency of said texture of said letters in proportion to said distance calculated by said distance calculating means.
4. A game apparatus according to claim 1, wherein said form changing means changes a size of said texture of said letters.
5. A game apparatus according to claim 1, wherein said form changing means changes the form of said texture of said letters such that a relationship between the form of said texture of said letters and the distance is different from a relationship between said sound and the distance.
6. A game apparatus according to claim 5, wherein in the relationship between the form of said texture of said letters and the distance, a threshold value of the distance for generating said letters is differentiated from a threshold value of the distance for generating said sound.
7. A game message displaying method in a game apparatus which displays letters as visual support for a sound generated by a message generating object by use of a billboard, comprising following steps of:
a distance calculating step for calculating a distance between said message generating object and a player object; and
a form changing steps for changing a form of a texture of said letters to be pasted on said billboard depending upon said distance calculated by said distance calculating step.
8. A game message displaying method according to claim 7, wherein in said form changing step, transparency of said texture of said letters is changed.
9. A game message displaying method according to claim 8, wherein in said form changing step, the transparency of said texture of said letters is increased in proportion to said distance calculated by said distance calculating step.
10. A game message displaying method according to claim 7, wherein in said form changing step, a size of the texture of said letters is changed.
11. A game message displaying method according to claim 7, wherein in said form changing step, a relationship between the form of said texture of said letters and the distance is differentiated from a relationship between said sound and the distance.
12. A game message displaying method according to claim 11, wherein in the relationship between the form of said texture of said letters and the distance, a threshold value of the distance for generating said letters is differentiated from a threshold value of the distance for generating said sound.
13. A storage medium storing a program to display a game message in a game apparatus which displays letters as visual support for sound generated by a message generating object by use of a billboard, said program makes a processor of said game apparatus execute following steps of:
a distance calculating step for calculating a distance between said message generating object and a player object; and
a form changing step for changing a form of a texture of said letters to be pasted on said billboard depending upon said distance calculated in said distance calculating step.
14. A storage medium storing a game message displaying program according to claim 13, wherein in said form changing step, transparency of said texture of said letters is changed.
15. A storage medium storing a game message displaying program according to claim 14, wherein in said form changing step, the transparency of said texture of said letters is increased in proportion to said distance calculated by said distance calculating step.
16. A storage medium storing a game message displaying program according to claim 13, wherein in said form changing step, a size of said texture of said letters is changed.
17. A storage medium storing a game message displaying program according to claim 13, wherein in said form changing step, a relationship between the form of said texture of said letters and the distance is differentiated from a relationship between said sound and the distance.
18. A storage medium storing a game message displaying program according to claim 17, wherein in the relationship between the form of said texture of said letters and the distance, a threshold value of the distance for generating said letters is differentiated from a threshold value of the distance for generating said sound.