We propose a novel fiber Bragg grating (FBG) sensor interrogation using a Raman-based Fourier-domain mode locking (FDML) fiber laser for a high speed and long distance measurement. A residual Raman pump after the generation of the Raman-based FDML fiber laser is recycled for secondary signal amplification in a 2-m erbium-doped fiber (EDF) to further enhance the output power. The chromatic dispe...

Raman amplification of short laser pulses in plasma is a promising scheme for reaching extreme laser powers. This talk reviews recent progress in development of a plasma amplifier with ns pump pulses.

We demonstrate in-situ Raman measurements of individual silicon nanowires (100 nm diameter, 10-20 m in length) which are trapped using optoelectronic tweezers (OET). OCIS codes: (300.0300) Spectroscopy, Raman; (140.7010) Trapping. Optoelectronic tweezers (OET) is a dynamic, non-invasive optical manipulation tool that works based on the principle of light-induced dielectrophoretic force. It is c...

The effect of asymmetric laser pulses on plasma wave excitation in a self-modulated laser wakefield accelerator is examined. Laser pulse shape and frequency chirp asymmetries, controlled experimentally in the laser system through a grating pair compressor, are shown to strongly enhance measured electron yields for certain asymmetries. It is shown analytically that a positive (negative) frequenc...

In this work a remote Raman system has been designed, assembled and tested for detecting explosives, Toxic Industrial Compounds (TIC) and Chemical Warfare Agents Simulants (CWAS) at laboratory scale up to 7 m target-telescope distance. The prototype system consists of a Renishaw Raman Microspectrometer, model RM2000, equipped with a charge-coupled device (CCD) detector, a telescope, a fiber opt...

Several continuous-wave Nd:YVO(4) self-Raman lasers based on the primary and secondary Raman transitions of YVO(4) (893cm(-1) and 379cm(-1) respectively) are reported in this paper. Laser outputs were obtained at a wavelength of 1109nm, 1158nm and 1231nm with maximum output powers of 1.0W, 700mW and 540mW respectively. The respective absorbed pump power to Raman output power conversion efficien...

We experimentally analyze the impact of front-FBG reflectivity in ultra-long Raman laser amplifiers performance, showing Q-factor penalties in excess of 1 dB for FBG reflectivities above 10% in a 30 GBaud DP-QPSK transmission system. © 2016 OSA. DOCUMENT TYPE: Conference Paper 2. Impact of input FBG reflectivity and forward pump power on RIN transfer in ultralong Raman laser amplifiers (2016) O...

Physics) TWO-PHOTON RAMAN GAIN IN A LASER DRIVEN POTASSIUM VAPOR by

We demonstrate a tunable deep-ultraviolet coherent source generated by the beating of a tunable UV laser and strongly driven vibrational Raman coherence in hydrogen. The total energy conversion efficiency reaches a maximum of 50% at the phase side of the Raman coherence. The generated spectrum of Raman sidebands tunes with the input and extends from 435 to 146 nm for an input at 282 nm.

The observation of pure phonon confinement effect in germanium nanowires is limited due to the illumination sensitivity of Raman spectra. In this paper we measured Raman spectra for different size germanium nanowires with different excitation laser powers and wavelengths. By eliminating the local heating effect, the phonon confinement effect for small size nanowires was clearly identified. We h...