Patent ID: 6563854
Filing Date: 2003-05-13
Classification: H01S

Abstract:
An integrated laser module suited to Raman spectroscopy and other applications, comprising:a laser diode coupled to an optical grating forming an external cavity configuration outputting a beam of light having a nominal wavelength along an optical path; and a holographic bandpass filter disposed in the optical path to transmit elements of the beam having the nominal wavelength and reject beam elements of differing wavelengths, the bandpass filter including: a transmission grating having first and second sides supported so that the beam intersects the first side at an angle thereto so as to disperse the various wavelengths of the beam through angles which are a function of their wavelength, and one or more optical elements supported in relation to the second side of the holographic transmission grating for forming an exit beam of narrowband light at the nominal wavelength while rejecting dispersed light of a wavelength differing from the nominal wavelength.