Patent ID: 7389027

Claim:
A pitch side optical system for use in diode laser spectroscopy comprising: more than one diode laser having a select lasing frequency, each diode laser being coupled to a proximal end of a distinct input optical fiber; a multiplexer optically coupled to a distal end of fewer than all of the input optical fibers, the multiplexer optically coupling multiplexed laser light from the fewer than all of the input optical fibers to a proximal end of a pitch side optical fiber; a coupler optically coupled to a distal end of the pitch side optical fiber and a distal end of an un-multiplexed input optical fiber, the coupler optically coupling multiplexed laser light from the pitch side optical fiber and un-multiplexed laser light from the un-multiplexed input optical fiber to a proximal end of a transmission optical fiber; and a pitch optic optically coupled to a distal end of the transmission optical fiber.