发明名称 |
Second-harmonic wave generating element. |
摘要 |
<p>An element for generating second-harmonic waves of a short wavelength from a fundamental wave emitting from the semiconductor laser and the like. The element comprises a substrate (111; 211) made of a ferroelectric crystal, a second-harmonic wave generator (119; 219) for generating second-harmonic wave from fundamental wave entered therein, and periodically arranged portions formed in a front stage region (135; 235) and a rear stage region (137; 237) of the element. The periodic portions or structures, each has pairs of parts or regions (131, 133; 231, 233) of a high optical refractive index and of a low optical refractive index so as to confine the fundamental waves in the second-harmonic wave generating portion. These regions have various kinds of material diffused or introduced therein and a thickness. According to other example of the element, the sign of a nonlinear optical coefficient of the region is periodically reversed and the region satisfies a quasi-phase-matching condition.</p> |
申请公布号 |
EP0439350(A2) |
申请公布日期 |
1991.07.31 |
申请号 |
EP19910300531 |
申请日期 |
1991.01.24 |
申请人 |
OKI ELECTRIC INDUSTRY CO., LTD. |
发明人 |
SHINOZAKI, KEISUKE, C/O OKI ELECTRIC IND. CO. LTD.;NONAKA, TOSHIO, C/O OKI ELECTRIC IND. CO. LTD. |
分类号 |
G02F1/377;G02F1/37 |
主分类号 |
G02F1/377 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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