Raman Amplifier Based on Amorphous Silicon Nanoparticles

Figure 2

Experimental setup for SRS measurements: pump-Raman laser; IRC: infrared collimator; F₁: bandpass filter at 1427 nm; probe: ECDL external cavity diode laser (tunable); OI: optical insulator; DF: dichroic filter; OB₁ (OB₂): microscope objective lens 50x (20x); F₂: long pass filter at 1500 nm; Ch: Chopper; PD: optically broadband photodetector; LIA: lock-in amplifier. Black lines represent electrical connections and wiring, green lines represent free-space optical beams, and magenta lines represent optical fiber. The inset shows how the pump and the probe interact with the sample.