Patent ID: 8218586
Filing Date: 2012-07-10
Classification: H01S

Abstract:
1. A wavelength tunable system comprising: a laser having an internal lasing cavity and an external cavity, the cavities having a common optical axis, the internal lasing cavity and the external cavity each has an optical path length determined by the optical index of refraction and the physical length of their respective cavities, and the length of the external cavity is a constant; a reflective grating fixed in the external cavity; a collimating lens between the internal lasing cavity and the reflective grating; and an adjustable reflective mirror defining one end of the external cavity and optically coupled to the fixed reflective grating, the adjustable reflective mirror pivots about an axis on the face of the fixed reflective grating, and the optical path length of the external cavity is an integer multiple of the optical path length of the internal lasing cavity.