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Papers by S. Bahk

Research paper thumbnail of Calculation of power density directly from diffraction integrals

Research paper thumbnail of Generation, Amplitude and Phase Characterization of 1021W/cm2 Intensity

Springer Series in OPTICAL SCIENCES, 2004

ABSTRACT The intensity of 1021 W/cm2 was generated by correcting F/1 off-axis paraboloid aberrati... more ABSTRACT The intensity of 1021 W/cm2 was generated by correcting F/1 off-axis paraboloid aberration in 30TW diffraction limited laser system. The importance of using diffraction calculation over spot size measurement in determining intensity is discussed.

Research paper thumbnail of Near diffraction limited high-contrast 10 terawatt laser

Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges

Research paper thumbnail of Suppression of parasitic lasing in multi-pass Ti-sapphire amplifiers

Infosecurity Today, 2003

ABSTRACT

Research paper thumbnail of Generation and characterization of the highest laser intensities (10^22 W/cm^2)

Optics Letters, 2004

We generated a record peak intensity of0.7 x 1022 W fcm2 by focusing a 45-TW laser beam with an f... more We generated a record peak intensity of0.7 x 1022 W fcm2 by focusing a 45-TW laser beam with an f/0.6 off-axis paraboloid. The aberrations of the paraboloid and the low-energy reference laser beam were measured and corrected, and a focal spot size of 0.8 pm was achieved. It is shown that the peak intensity can be increased to 1.0 x 1022'V'lf cm2 by correction of the wave front of a 45-TW beam relative to the reference beam. The phase and amplitude measurement provides for an efficient full characterization of the focal fieid.

Research paper thumbnail of ATI with ultra-relativistic laser in tightly focused regime

We report on optical field ionization of Ne, Ar and Kr atoms by 10 TW Ti:sapphire laser with dura... more We report on optical field ionization of Ne, Ar and Kr atoms by 10 TW Ti:sapphire laser with duration of 30 fs focused with f/2 parabola to a spot size of 2 microns and to a peak intensity of 10^20 W/cm^2. The comparison between the experiment and the Ammosov-Delone-Krainov model will be presented. The dynamics of electrons ionized from high

Research paper thumbnail of Yb:GdCOB regenerative amplifier

Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH37170), 2001

Summary form only given. In this summary, we present the first Yb:GdCOB regenerative chirped puls... more Summary form only given. In this summary, we present the first Yb:GdCOB regenerative chirped pulse amplification system to produce 12-mJ, and 350-fs pulses. We have extracted reasonable amount of energy from Yb:GdCOB. If we employ a diode-pumping scheme, we could obtain hundreds, of milli-joule pulses with high repetition rate

Research paper thumbnail of Relativistic generation of isolated attosecond pulses: a different route to extreme intensity

Journal of Modern Optics, 2005

Isolated attosecond pulses and electron bunches can be efficiently generated in the interaction o... more Isolated attosecond pulses and electron bunches can be efficiently generated in the interaction of intense lasers with plasma in the confined volume of the 3 regime. Scaling with intensity is found to improve pulse brevity and focusability greatly while the efficiency of the attosecond pulse generation continues to remain high. Practical consideration of the tools needed to generate such pulses indicates that such interactions are surprisingly accessible. We mention some introductory experiments whereby we may verify the theoretical predictions of this new class of attosecond pulses. This technique may enable us to reach the Schwinger intensity 10 29 W cm À2 .

Research paper thumbnail of Calculation of power density directly from diffraction integrals

Research paper thumbnail of Generation, Amplitude and Phase Characterization of 1021W/cm2 Intensity

Springer Series in OPTICAL SCIENCES, 2004

ABSTRACT The intensity of 1021 W/cm2 was generated by correcting F/1 off-axis paraboloid aberrati... more ABSTRACT The intensity of 1021 W/cm2 was generated by correcting F/1 off-axis paraboloid aberration in 30TW diffraction limited laser system. The importance of using diffraction calculation over spot size measurement in determining intensity is discussed.

Research paper thumbnail of Near diffraction limited high-contrast 10 terawatt laser

Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges

Research paper thumbnail of Suppression of parasitic lasing in multi-pass Ti-sapphire amplifiers

Infosecurity Today, 2003

ABSTRACT

Research paper thumbnail of Generation and characterization of the highest laser intensities (10^22 W/cm^2)

Optics Letters, 2004

We generated a record peak intensity of0.7 x 1022 W fcm2 by focusing a 45-TW laser beam with an f... more We generated a record peak intensity of0.7 x 1022 W fcm2 by focusing a 45-TW laser beam with an f/0.6 off-axis paraboloid. The aberrations of the paraboloid and the low-energy reference laser beam were measured and corrected, and a focal spot size of 0.8 pm was achieved. It is shown that the peak intensity can be increased to 1.0 x 1022'V'lf cm2 by correction of the wave front of a 45-TW beam relative to the reference beam. The phase and amplitude measurement provides for an efficient full characterization of the focal fieid.

Research paper thumbnail of ATI with ultra-relativistic laser in tightly focused regime

We report on optical field ionization of Ne, Ar and Kr atoms by 10 TW Ti:sapphire laser with dura... more We report on optical field ionization of Ne, Ar and Kr atoms by 10 TW Ti:sapphire laser with duration of 30 fs focused with f/2 parabola to a spot size of 2 microns and to a peak intensity of 10^20 W/cm^2. The comparison between the experiment and the Ammosov-Delone-Krainov model will be presented. The dynamics of electrons ionized from high

Research paper thumbnail of Yb:GdCOB regenerative amplifier

Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH37170), 2001

Summary form only given. In this summary, we present the first Yb:GdCOB regenerative chirped puls... more Summary form only given. In this summary, we present the first Yb:GdCOB regenerative chirped pulse amplification system to produce 12-mJ, and 350-fs pulses. We have extracted reasonable amount of energy from Yb:GdCOB. If we employ a diode-pumping scheme, we could obtain hundreds, of milli-joule pulses with high repetition rate

Research paper thumbnail of Relativistic generation of isolated attosecond pulses: a different route to extreme intensity

Journal of Modern Optics, 2005

Isolated attosecond pulses and electron bunches can be efficiently generated in the interaction o... more Isolated attosecond pulses and electron bunches can be efficiently generated in the interaction of intense lasers with plasma in the confined volume of the 3 regime. Scaling with intensity is found to improve pulse brevity and focusability greatly while the efficiency of the attosecond pulse generation continues to remain high. Practical consideration of the tools needed to generate such pulses indicates that such interactions are surprisingly accessible. We mention some introductory experiments whereby we may verify the theoretical predictions of this new class of attosecond pulses. This technique may enable us to reach the Schwinger intensity 10 29 W cm À2 .

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