Kang Kang Chen

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We demonstrate active pulse shaping using an Electro-Optic Modulator in order to compensate the pulse shaping effects caused by Gain Saturation in a high power Yb doped fiber amplifier chain and to generate various custom-defined output pulse shapes. Square, step and smooth pulse shapes are achieved, with mJ pulse energies. Use of a modulator to shape(More)
We demonstrate the selective excitation of individual Raman Stokes lines of up to the ninth order by pumping with rectangular-shaped optical pulses at 530 nm from a frequency-doubled adaptively pulse shaped fiber master oscillator power amplifier. We achieve extinction ratios of up to 15 dB between selected and adjacent Raman orders in a 1-km-long fiber.
We demonstrate a picosecond optical parametric oscillator (OPO) that is synchronously pumped by a fiber-amplified gain-switched laser diode. At 24W of pump power, up to 7.3W at 1.54microm and 3.1W at 3.4microm is obtained in separate output beams. The periodically poled MgO-doped LiNbO(3) OPO operates with ~17ps pulses at a fundamental repetition rate of(More)
Introduction High average power laser sources operating in the picosecond (ps) regime are useful for a wide range of applications including frequency-doubling and pumping of OPOs. Gain switching (GS) of laser diodes provides a practical and low cost method to generate ps pulses at GHz repetition rates and mW average power levels. Such devices represent(More)
We report a rapidly tunable, wavelength agile fiber laser system capable of the synchronous generation of sequences of pulses with different wavelengths in the visible region of the spectrum using stimulated Raman scattering of multi-step pump pulses in a 250 m length of fiber. The frequency doubled output of a single polarization all-fiber Yb-doped MOPA(More)
This paper demonstrates a single polarisation, 1.06 microm Yb-doped fiber MOPA, delivering 21 ps pulses in a diffraction limited beam at repetition rates of up to 908 MHz and average output power of 100 W. The maximum pulse energy was 1.7 microJ at a repetition rate of 56 MHz, with corresponding peak power of 85 kW. The 100 W power was limited by available(More)
We report a tunable synchronously pumped fiber Raman laser (SPFRL) in the near-infrared (NIR) and visible wavebands pumped by a pulsed, all-fiber PM 1060 nm master oscillator power amplifier (MOPA) and its frequency-doubled output, respectively. The seed was adaptively shaped to deliver rectangular output pulses, thereby enabling selective excitation of(More)