| 摘要 |
<p>A wavelength detector in which reference light (31) generated in a reference light source (30) and light (11) to be detected are directed to an etalon (62), and the light that has transmitted through the etalon is detected by light detecting means (64). The front focal surface (50) of a collimator lens (61) is irradiated with the reference light and the light to be detected. These lights are converted into parallel rays through the collimator lens and fall on the etalon. The reference light and the light to be detected that have passed through the etalon are focused by focusing lens means (63) on the detecting surface of light detecting means to form thereon interference fringes that correspond to the reference light and the light to be detected. Based on the interference fringes, relative wavelength of the light to be detected to the reference light, i.e., the absolute wavelength of the light to be detected, is measured.</p> |
