In this paper, we demonstrated a 2815-W bidirectonal side-pumped DSCCP fiber master oscillator power amplifier (MOPA) configuration within the 250 μm cladding fiber, with the slope efficiency of 77.8%. And the output power is limited by the pump power. As we know, it is very difficult to get multi kW output power in 250μm general double cladding fiber. If a two cascaded amplifiers is employed, a 6 kW output power can be expected.
The side-coupled cladding-pumped fiber has many advantages in terms of system design, ease of pump injection, signal extraction and power scalability over traditional double cladding fiber. We demonstrate a 290-W all home-made side-coupled cladding-pumped fiber laser with the slope efficiency of 67.8%. To the best of our knowledge, the slope efficiency is the highest for the published high power fiber laser based on the DSCCP fiber. The slope efficiency of the home-made side-coupled cladding-pumped fiber amplifier is mainly limited by the background loss, pump light coupling and pump light absorption. The results show that the power ratio of signal light to residual pump light is near 20 dB. The pump light is not absorbed enough that the slope efficiency can be further improved by optimizing the amplifier structure.
Current research on Surface plasmon polaritons (SPPs) is widely spread to surface adsorption, surface roughness and
other related phenomena. It has also been used in the chemical and biological high-precision detection fields. More and
more high-precision sensors have been created. Supercontinuum (SC) is a laser source with advantages as broad and flat
spectra, high brightness and good coherent characters. By researching the SC laser source based surface plasmon
resonance (SPR) effect, we can get a more comprehensive reflection of the SPR effect from factors as the light intensity
reflectivity and the phase change. The SC laser source based SPR effect is a subject with important theoretical and
practical significance. The testing principles and testing methods of the SPR effect in the installations with the Au-coated
prism structure were studied. Using a SC laser, the wavelength-scanning and angle-scanning methods can be carried out
in one system. The SC laser source based SPR effect in the installations with the Au-coated prism structure was tested.
The SPR effect sensors based on SC were designed and realized. The theoretical results matched with the experimental
results. Through the relation between the refractive index and the resonance wavelength, we could demarcate different
substances.
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