Fiber phase conjugators: time- and frequency-resolved reflectivity

Summary form only given. Undoped multimode quartz fibers based on stimulated Brillouin scattering (SBS) can be used as effective phase conjugators with low power threshold and high fidelity in a broad wavelength range from the near infrared over the visible down to the near ultraviolet. In the first investigation of fiber phase conjugators for input pulses with a coherence length of about 50 cm at 1064-nm wavelength, a saturation of the SBS reflectivity was observed at a value of about 50%, not considering the reflection losses on the fiber surface. To understand this saturation phenomenon, we analyzed the temporal and spectral structures of the transmitted and reflected light.