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KERI, South Korea

Kim G.H.,Korea Center | Kang U.,Korea Center | Heo D.,Korea Center | Yashin V.E.,S. I. Vavilov State Optical Institute | And 3 more authors.
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2010

A femtosecond laser based on an Yb:KYW crystal with direct longitudinal pumping by a high-power semiconductor injection laser with a fiber output is described. Femtosecond pulses were generated in the self-longitudinal-mode- locking operating condition due to the use of a semiconductor saturable absorber. The average power of the oscillator was as high as 3.5 W at a central wavelength of 1035 nm, the pulse length and pulse repetition rate being 200 fs and 85.5 MHz, respectively. The product of the pulse length and the radiation spectrum width was 1.3 times higher than the theoretical limit for the pulse shape described by the function sech2. The designed master oscillator can be also used as a stand-alone source of femtosecond radiation pulses for material microprocessing and primary source for femtosecond laser amplification systems. © 2010 Pleiades Publishing, Ltd. Source


Kim G.H.,Korea Center | Kang U.,Korea Center | Heo D.,Korea Center | Yashina V.E.,S. I. Vavilov State Optical Institute | And 3 more authors.
Journal of Optical Technology (A Translation of Opticheskii Zhurnal) | Year: 2010

This paper describes a femtosecond laser based on Yb:KYW with direct pumping by a semiconductor injection laser. The Yb:KYW laser crystal was pumped longitudinally with the radiation of an InGaAs semiconductor injection laser with fiber output of the radiation. The spatial structure of the radiation of the semiconductor laser was reshaped by a lens-based optical system in order to maximize its power concentration in the volume of the laser medium. Femtosecond pulses were generated in the longitudinal mode-locking regime by using a semiconductor saturable absorber. The generator's mean power exceeded 1 W at the central wavelength of 1043 nm, with a pulse about 90 fs wide. The master oscillator thus developed can be used both as a self-contained source of femtosecond light pulses and as a priming source for femtosecond laser amplifier systems. © 2010 Optical Society of America. Source

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