摘要:
A wavelength locker for use at more than one wavelength includes filters with different characteristics for a corresponding detector. The filters may be etalons having different free spectral ranges, e.g., having different apparent or real thicknesses. If more than three such filters are used outputting offset periodic signals, a reference detector may be eliminated and continuous operation over a wavelength range may be realized.
摘要:
A wavelength locker for use at more than one wavelength includes filters with different characteristics for a corresponding detector. The filters may be etalons having different free spectral ranges, e.g., having different apparent or real thicknesses. If more than three such filters are used outputting offset periodic signals, a reference detector may be eliminated and continuous operation over a wavelength range may be realized.
摘要:
Numerous features may be incorporated into a wavelength locker to reduce the noise inherent therein. These features may be used in any combination thereof. These features include avoiding the use of reflectors, using a diffractive splitter which outputs evanescent beams for diffractive orders greater than one, using anti-reflective coatings, using an opaque material with through holes for the light, and designing the wavelength locker to be used at a tilt.
摘要:
An aspheric microlens, particularly a conic constant of the microlens, may be evaluated and this evaluation may be used to determine an optimal process for creating the aspheric microlens. Such evaluation may include a curve fitting or a numerical expression of the wavefront.