To provide a wavelength conversion element and wavelength conver sion device which are formed by using a nonlinear optical crystal belonging to a point group 3m, such as β-BaB2O4 and are capable of maintaining the wavelength conversion efficiency at a high level, diminishing the variation of the wavelength conversion efficiently in spite of use of the plural crystals, such as β-BaB2O4 crystals, and eventually improving the stability of the device.
The phase matching angle of the type 1 of the wavelength conversion element and wavelength conversion device formed by using the nonlinear optical crystal belonging to the point group 3m, such as β-BaB2O4, is ≥45° and the θ and at the time of phase matching are so set as to approximately satisfy equation I: sin(3)=1, equation II: d22/d31/tanθ/sin (3)<0 when the angle formed by the surge vector of the incident angle to be phase matched with a +c axis (a direction of plus polarity of the c axis) is defined as θ, the angle formed by the projection of this surge vector to face ab from the a axis as counterclockwise when viewed from the +c direction, d22 as the quadratic nonlinear optical constant of the nonlinear optical crystal and d31 as the quadratic nonlinear optical constant having a specified relation with d22.
| WO/2004/114479 | BEAM COMBINER |
| JPH01156462 | PRODUCTION OF THIN FILM OF FERROELECTRIC SUBSTANCE |
| JP2541478 | ALIGNER |
KIMURA KAORU
| JPH07170009A | 1995-07-04 | |||
| JPH07244310A | 1995-09-19 | |||
| JPH07170009A | 1995-07-04 | |||
| JPH07244310A | 1995-09-19 |
JPN6009015968, Ｋ． Ｋａｔｏ, "Ｓｅｃｏｎｄ−Ｈａｒｍｏｎｉｃ Ｇｅｎｅｒａｔｉｏｎ ｔｏ ２０４８ Å ｉｎ β−ＢａＢ２Ｏ４", ＩＥＥＥ Ｊｏｕｒｎａｌ ｏｆ Ｑｕａｎｔｕｍ Ｅｌｅｃｔｒｏｎｉｃｓ, 198607, Ｖｏｌ．ＱＥ−２２， Ｎｏ．７, ｐｐ．１０１３−１０１４, US
JPN6010038416, Ｄ．Ｊ． Ｂｅｒｋｅｌａｎｄ， Ｆ．Ｃ． Ｃｒｕｚ， ａｎｄ Ｊ．Ｃ． Ｂｅｒｇｑｕｉｓｔ, "Ｓｕｍ−ｆｒｅｑｕｅｎｃｙ ｇｅｎｅｒａｔｉｏｎ ｏｆ ｃｏｎｔｉｎｕｏｕｓ−ｗａｖｅ ｌｉｇｈｔ ａｔ １９４ ｎｍ", Ａｐｐｌｉｅｄ Ｏｐｔｉｃｓ, 19970620, Ｖｏｌ．３６， Ｎｏ．１８, ｐｐ．４１５９−４１６２
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