Patent ID: 9644805
Date: 2017-05-09
CPC Classifications: F21K,G02B,G03B,H01S

Claim:
1. An optical module that outputs multiplexed light containing red light, green light, and blue light, comprising: a first laser diode (LD) to emit a first light that is one of the red light, the green light or the blue light; a second LD to emit a second light that is one of the red light, the green light or the blue light excluding one used for the first LD; a third LD to emit third light that is one of the red light, the green light or the blue light excluding ones used for the first and second LDs; a first lens to collimate the first light emitted from the first LD to generate collimated first light; a second lens to collimate the second light emitted from the second LD to generate collimated second light; a third lens to collimate the third light emitted from the third LD to generate collimated third light; a package enclosing the first to third LDs and the first to third lenses; a first wavelength selective filter (WSF) that reflects one of the collimated first light and the collimated second light but transmits another of the collimated first and the collimated second light to generate mid-multiplexed light containing the collimated first light and the collimated second light whose optical axes are aligned to each other; and a second WSF that reflects one of the mid-multiplexed light and the collimated third light but transmits another of the mid-multiplexed light and the collimated third light, wherein the second WSF outputs the multiplexed light containing the collimated first light, the collimated second light, and the collimated third light whose optical axes are aligned to each other, wherein the collimated first light, the collimated second light, and the collimated third light are aligned with an optical axis of the optical module to be generated as the multiplexed light, wherein the first to third lenses and the first and second WSFs are mounted on a base, and wherein optical axes of the second and third LDs are substantially orthogonal to an optical axis of the first LD.