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High-quality, 1-kHz, 20-fs, 0.15-TW Ti:sapphire Laser with a Single-stage Amplifier
성재희,유태준,정태문 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.8
We have demonstrated the generation of 20-fs, 0.15-TW laser pulses with high temporal and spatial qualities from a kHz femtosecond Ti:sapphire laser system with a single-stage amplifier. A maximum output energy of 4.1 mJ could be achieved from the amplifier by suppressing thermal lensing effect. The spectral bandwidth of 57 nm was obtained by maximizing reflection bandwidth that the amplifier could support and by compensating for gain narrowing. The temporal profile close to the Fourier-transform-limited pulse profile was obtained by minimizing the spectral phase error, and the pulse duration was 20 fs at FWHM. The measured beam quality factors were 1.2 and 1.4 in the horizontal and the vertical directions, respectively.
Numerical Analysis of Working Distance of Square-shaped Beam Homogenizer for Laser Shock Peening
김태신,유태준,황승진,홍경희 한국광학회 2017 Current Optics and Photonics Vol.1 No.3
To apply a square-shaped beam homogenizer to laser shock peening, it should be designed with a longworking distance and by considering metal targets with various shapes and textures. For long workingdistances, a square-shaped beam homogenizer with a long depth of focus is required. In the range ofworking distance, the laser beam is required to have not only high efficiency but high uniformity, in otherwords, a good peening quality is guaranteed. In this study, we defined this range as the working distancefor laser shock peening. We have simulated the effect of some parameters on the working distance. Theparameters include the focal length of the condenser lens, pitch size of the array lens, and plasma thresholdof the metal. The simulation was performed through numerical analysis by considering the diffraction effect.
윤진우,이성구,유태준,성재희,정태문,이종민 한국물리학회 2012 Current Applied Physics Vol.12 No.3
We design a two-stage non-collinear optical parametric chirped pulse amplifier using BBO crystals for a high-power Ti:sapphire laser system, and numerically analyze the output characteristics of the OPCPA system. We find optimal phase-matching conditions and calculate the parametric gains as a function of pump intensity and interaction length. By constructing a two-stage OPCPA system using two BBO crystals, we obtain 12 mJ output energy corresponding to a high gain of 107, a pulse duration of 37 fs, and a contrast ratio of 5×10-8.