Hundred-kilowatts-level monolithic fiber laser based on auxiliary lasers and hybrid cladding pumping scheme

A hundred-kilowatts-level monolithic fiber laser based on multi-wavelength auxiliary lasers and hybrid cladding pumping, comprising the following operations:

• outputting, by a signal laser seed source, a signal laser with a central wavelength of λs, outputting, by a first auxiliary laser source, a second auxiliary laser source, . . . , and an Nth auxiliary laser source, auxiliary lasers with central wavelengths of λP1, λP2, λP3, . . . and λPN respectively;
• the signal laser seed source, the first auxiliary laser source, the second auxiliary laser source, . . . and the Nth auxiliary laser source are coupled into the core of gain fiber through a signal port of a cladding pumping combiner;
• outputting, by a first cladding pumping laser, a second cladding pumping laser, a third cladding pumping laser, . . . and an Nth cladding pumping laser, cladding pumping lasers with gradually-increased central wavelengths of λPC1, λPC2, . . . and λPCN respectively, and the cladding pumping lasers enter the cladding of gain fiber of power amplifier stage through the cladding pumping combiner;
• sequentially amplifying the first auxiliary laser source, the second auxiliary laser source, . . . and the Nth auxiliary laser source and the signal laser seed source in the gain fiber;
• and the amplification of signal laser is suppressed at a front segment of the gain fiber;
• and with the power decreasing of cladding pumping lasers, the first auxiliary laser source, the second auxiliary laser, . . . and the Nth auxiliary laser source in the fiber core will be gradually reabsorbed by gain fiber;
• then the 1090 nm single-mode laser can be effectively amplified at a rear segment of the gain fiber, and hundred-kilowatts-level near-diffraction-limited 1090 nm single-mode laser is achieved after the end cap.