Abstract:
PROBLEM TO BE SOLVED: To provide a device for measuring an optical characteristic of an object to be measured, which is capable of measuring hemisphere total reflectance, hemisphere total transmittance, and light distribution while achieving a reduction in measuring time, and improving accuracy in a quantitative analysis of hemisphere total reflectance and transmittance.SOLUTION: A bi-oval type optical system is an optical system that has three focuses on an axis by combining each of one of respective focuses of two ellipsoidal mirrors into a common focus. The bi-oval type optical system includes a partial spheroidal mirror 2, such as cut into a quarter, and a plate-like spheroidal mirror 1. A hemispherical detection optical system, including a hemispherical lens 4 or a rotational parabolic mirror, is provided at a focus position of the partial spheroidal mirror. As a result, a light beam, scattered by an object to be measured, is reflected from a mirror surface of the partial spheroidal mirror to be condensed at the focus. A CCD camera 6 photographs the condensed light beam through, for example, the hemispherical lens and a tapered optical fiber 5 to measure an optical characteristic of the object to be measured.
Abstract in simplified Chinese:本发明揭示一种可以低温操作之锁模激光系统,其可包含一退火频率转换晶体及用以在该低温标准操作期间维持该晶体之一退火条件之一外壳。在一实施例中,该晶体可具有一增加长度。第一光束塑形光学器件可经组态以将来自一光源之一光束聚焦至位于该晶体中或该晶体接近处之一光束腰处之一椭圆形横截面。一谐波分离区块可将来自该晶体之一输出分成空间中被分离之不同频率光束。在一实施例中,该锁模激光系统可进一步包含第二光束塑形光学器件,其经组态以将一椭圆形横截面之所要频率光束转换成具有一所要纵横比(诸如一圆形横截面)之一光束。