Infrared seed light source and laser system

The invention relates to the technical field of photoetching laser, and discloses an infrared seed light source and a laser system.The infrared seed light source comprises a first pumping source, a second pumping source, a first wavelength division multiplexer, a gain optical fiber, a second wavelength division multiplexer and an optical fiber coupler; laser output by the first pumping source enters the gain optical fiber from one end of the gain optical fiber to provide pumping energy for the gain optical fiber; laser output by the second pumping source enters the gain optical fiber from the other end of the gain optical fiber to provide pumping energy for the gain optical fiber; the gain optical fiber generates first infrared laser under excitation of pumping energy, and the first infrared laser is oscillated and amplified in the annular resonant cavity and is output through the optical fiber coupler. According to the invention, a bidirectional pumping mode is adopted, and by adjusting the power of the firs