Abstract: The present invention relates to a spectral detection device (100) for detecting spectral components of received light, wherein the spectral detection device (100) comprises a filtering structure (110) arranged to filter the received light and output light with a wavelength within a predetermined wavelength range; and a light sensor (120) arranged to detect the light output by the filtering structure (110), wherein the filtering structure (110) is variable to allow a variation of the predetermined wavelength range over time. The arrangement enables a compact spectral detection device that may be provided at a low cost.

Abstract: An image capturing device includes a housing defining an aperture, a first lens module arranged inside the housing, a second lens module arranged inside the housing, and a light reflection assembly aligned with the aperture. The first lens module and the second lens module are positioned at opposite sides of the aperture. The light reflection assembly includes a reflecting mirror. The light reflection assembly is rotatable between a first position where the reflecting mirror reflects light from the aperture towards the first lens module and a second position where the reflecting mirror reflects light from the aperture towards the second lens module.

Abstract: An optical apparatus includes: a focusing lens that focuses light which is one of recording light being irradiated to an optical recording medium with reference light for recording a hologram and reference light being irradiated to an optical recording medium for reading out a hologram; and a focal position-shifting unit that refracts the light while moving in accordance with a moving speed of the optical recording medium, so as to shift a focal position of the light in the optical recording medium a distance in a thickness direction of the optical recording medium.

Abstract: A method of operating a laser projection system is provided. The projection system comprises an external cavity laser, an optical intensity monitor, laser projection optics, and a controller. The external cavity laser comprises a laser diode, an intra-cavity wavelength conversion device, and a wavelength selective element. According to the method, the position of the wavelength selective element is adjusted relative to an optical axis Z of the external cavity laser to optimize output intensity. Specifically, the position of the wavelength selective element is adjusted by (i) tilting the wavelength selective element about its wavelength selective axis Y to reflect a wavelength of interest along an optimum path in an XZ plane of the external laser cavity and (ii) tipping the wavelength selective element about its wavelength insensitive axis X to reflect the wavelength of interest along an optimum path in a YZ plane of the external laser cavity. Additional embodiments are disclosed and claimed.

Abstract: An optical MEMS retro-reflective apparatus with modulation capability having a retro-reflecting structure including a pair of reflective surfaces; and a MEMS device for moving at least one of the reflective surfaces of said pair of reflective surfaces relative to another one of the reflective surfaces of said pair of reflective surfaces a distance which causes the pair of reflective surfaces to switch between a reflective mode of operation and a transmissive mode of operation. A substrate and a moveable grating structure may be substituted for the reflective surfaces.

Abstract: A scanning system, including a main housing, and at least one optical wedge (12) rotatable about a shaft means (40) located within the main housing (26), wherein a laser beam having an optical axis and incident on the optical wedge (12), is refracted at least once by the wedge; characterized in that the shaft means (40) passes through the center of the at least one wedge (12) and that the optical axis of the incident laser beam is substantially parallel to, but laterally offset from, the shaft means (40).