Patent Number: 7,088,747

Title: Variable wavelength light source

Abstract: When a piezoelectric element 3 applies an external force to a plastic photonic crystal, the photonic crystal deforms, and accordingly, the photonic band gap easily changes. When the photonic band gap changes, transmission of light with a specific wavelength is limited. Therefore, light with a desired wavelength is outputted from the photonic crystal 2 upon sufficient tuning, and extracted to the outside through an output window 6. In the present invention, a plastic photonic crystal 2 which can achieve sufficient wavelength tuning although it is small is used, and elements are unitized, so that the entire wavelength tunable light source unit is downsized.

Inventors: Takiguchi; Yoshihiro (Hamamatsu, JP), Itoh; Kensaku (Fuchu-machi, JP), Yamanaka; Junpei (Nagoya, JP)

Assignee: Hamamatsu Photonics K.K.

International Classification: H01S 3/10 (20060101); H01S 3/08 (20060101); H01S 3/091 (20060101); H01S 3/115 (20060101); H01S 3/121 (20060101)

Expiration Date: 8/08/02018