Broadband Continuously Tunable All-Fiber Laser Based on OPG for CARS Imaging

A broadband continuously tunable SESAM all-fiber laser based on optical parametric generation (OPG) for coherent anti-stokes Raman scattering (CARS) imaging applications is presented in this article. This structure built all-polarization maintaining fibers yielding high environmental stability. The OPG PM photonic crystal fiber as gain pumped by a wavelength-tunable (1025 to 1055 nm) and repetition rate-tunable (3 MHz 500 KHz) Yb-doped pulsed laser. features free polarization adjustment slow-axis operation with wavelength range from 770 940 nm signal radiation 1225 1510 idler radiation. pump pulses (CARS-Stokes CARS-pump respectively) are intrinsically overlapped, both spatially temporarily, due the four-wave mixing (FWM) emitted single end. CARS-Stokes pulse duration vary between 25 32 ps 21 24 ps, respectively whole band, ensuring good overlap of generated signals, exhibit Gaussian profile spatial beam quality. frequency conversion allows obtain difference signals 1100 3300 cm - 1 . reported low-cost source ideal bio-imaging applications, especially CARS imaging, its compactness, simplicity, robustness ease handling. patent has been filed technology.