초록 ▼

1. 고출력 펨토초 레이저를 이용하여 결맞는 X-선 광원을 개발함. 펄스폭 20-30 fs, 출력 1-3 TW 레이저 펄스를Ar, Ne, He등의 기체 원자에 접속하여 극자외선/연 X-선 영역의파를 발생하고 이의 분광구조를 연구함．이를 통해 하고 고차조화파의 비점진적 청색변이 특성을 규명하고 고차조화파 발생 과정의 결맞는 조정 (coherent control)을 성취함. 연속적으로 파장 가변할 수 있는 고차조화파 X-선 발생을 입증함．
2. 고차조화파 발생과정을 이론적으로 연구함．강한 레이저장내의 원자상태를 양자역학적으로 계산

1. 고출력 펨토초 레이저를 이용하여 결맞는 X-선 광원을 개발함. 펄스폭 20-30 fs, 출력 1-3 TW 레이저 펄스를Ar, Ne, He등의 기체 원자에 접속하여 극자외선/연 X-선 영역의파를 발생하고 이의 분광구조를 연구함．이를 통해 하고 고차조화파의 비점진적 청색변이 특성을 규명하고 고차조화파 발생 과정의 결맞는 조정 (coherent control)을 성취함. 연속적으로 파장 가변할 수 있는 고차조화파 X-선 발생을 입증함．
2. 고차조화파 발생과정을 이론적으로 연구함．강한 레이저장내의 원자상태를 양자역학적으로 계산하여 고차조화파의 분광구조를 설명할 수 있는 이론적 방법을 개발함．단일원자 계산결과를 토대로 결맞는 합과 Wigner 분포 함수 방법을 도입하여 고차조화파 실험결과를 설명함．
3. 강력한 레이저와 원자와의 상호작용을 연구하기 위해 IkHz의 반복율을 갖는 10펨토초 0.1테라와트의 고출력 고반복 펨토초 티타늄 사파이어 레이저를 개발과 개발된 고출력 펨토초 레이저의 시공간적 특성을 조사함．10펨토초 이하의 극초단 펄스(8,3 펨토초)를 갖는 기술을 확보함．기사 용중인 10Hz, 20 펨토초 3 테라와트 티타늄 사파이어 레이저의 최적상태 운전과 개발된 고출력 펨토초 레이저의 시공간적인 특성을 SPIDER 장치와 CCD를 이용하여 조사하고 이를 바탕으로 레이저 성능의 최적화를 수행함．

Abstract ▼

(1) Realization of a tunable coherent femtosecond X-ray source. -
- Coherent control of high harmonics to realize a continuously tunable, coherent, femtosecond x-ray source, i.e. a tabletop synchrotron.
(2) Understanding the fundamental physical process in laser-atom interaction.
- The nu

(1) Realization of a tunable coherent femtosecond X-ray source. -
- Coherent control of high harmonics to realize a continuously tunable, coherent, femtosecond x-ray source, i.e. a tabletop synchrotron.
(2) Understanding the fundamental physical process in laser-atom interaction.
- The numberical simulation and the theoretical investigation of high-order harmonic generation for the deeper understanding of its generation mechanism and to explain some experimental results.
(3) Development of high power femtosecond laser technology.
- Generation of 10-fs, 0.1-TW Pulses at 1 kHz repetition rate and characterization of the femtosecond pulse.

목차 Contents

• 표지...1
• 제출문...2
• 보고서 초록...3
• 요약문...4
• SUMMARY...7
• CRI Form 4...9
• 1. Research Objectives and Evaluation Criteria...10
• A. Proposed objectives...10
• B. Evaluation criteria...11
• 2. Current Thrend and Future Directions...12
• (1) High harmonic X-ray generation...12
• (2) Theory development of high harmonic generation...15
• (3) Up-to-date femotosecond laser technologies...16
• References...17
• 4. Progress Analysis...20
• A. Degree of objectives fulfillment...20
• B. Self evaluation...29
• 4. Planned Approaches for the Research (methods)...32
• (a) First year (1999)...32
• (b) Second year (2000)...33
• (c) Third year (2001)...34
• 5. Result...37
• A. Research details...37
• B. Research results...47
• 6. Details of Research Achievements...51
• A. Journal Papers...51
• B. International Conferences...53
• A.1. High Harmonic X-Ray Generation...56
• A.1.1. Continously Tunable High Harmonic X-Ray Generation from Atoms in an Intense Femtosecond Laser Field...56
• References...62
• A.1.2. Nonadiabatic Blueshift of High Harmonics from Ar and Ne Atoms in an Intense Femtosecond Lase Field...65
• References...79
• A.1.3. Control of the Spectral Structure og High Harmonics using Chirped Lase Pulses...87
• References...93
• A.1.4. Selection of High Harmonics from a Single Quantum Path for Attosecond Pulse GEneration...97
• Refernces...105
• A.2. Theory Development of High Harmonic Generation...108
• A.2.1. Coherent Sum Technique...109
• A.2.2. Time-Frequency Analysis...116
• References...123
• A.3. Operation and Development of Femtosecond Terawatt Lasers...134
• A.3.1. Development of a 1 kHz Femtosecond Terawatt Laser...134
• References...141
• A.3.2. Temporal Structure of Chirped Laser Pulses...142
• References...149
• A.3.3. Focused Spot Size and Intensity MEasurement in a Femtosecond Terawatt Ti:sapphire Laser...150
• References...153
• A.3.4. Incorporation of a Cavity-Dumped Oscillator in a Femtosecond Terawatt Ti:sapphire Laser...154
• References...160
• A.1. High Harmonic X-Ray Generation...161
• A.1.1. Coherent Control of High-Order Harmonious with Chirped Femtosecond Laser Pulses...161
• References...167
• A.1.2. Continously Tunable High-Harmonic X-rays from Atoms in an Intense Femtosecond Laser Field...170
• References...177
• A.1.3. Bright, low-divergence high-order harmonic generation in a long gas jet...182
• References...186
• A.2. Theory development of high harmonic generation...190
• A.2.1. Self-phase modulation of laser pulse propagating in an ionizing medium...190
• A.2.2. Propagation of high-order harmonics...194
• A.2.3. Attosecond pulse generation...197
• References...199
• A.3. Operation and Development of Femtosecond Terawatt Lasers...207
• A.3.1. Development of a 1-kHz Femtosecond Terawatt Laser...207
• References...214
• A.3.2. Graphical Interpretation of Instantaneous Carrier Frequency of Chirped Gemtosecond Pulses using the Wingner Time-Frequency Distribution...228
• References...234
• A.3.3. Adaptive pulse compression using a micro-machined deformable mirror...255
• References...258
• A.4. Emission of a hot electrom jet from intense femtosecond laser-cluster interactions...265
• References...272
• A.1. High Harmonic X-Ray Generation...279
• A.1.1. Chirp analysis og high-order harmonics from atoms driven by intense femtosecond laser pulses...279
• References...285
• A.1.2. Generation of high harmonics with low beam devergence and good wavelength thmability...291
• References...294
• A.1.3. Wave-front phase measurement of high-order harmonic beams using the point-diffraction interferometry...298
• References...302
• A.2. Theory of high harmonic generation...307
• A.2.1 Time-frequency analysis of high harmonic generation...307
• References...311
• A.2.2. Ion momentum distributions for He single and double ionization in stron laser fields...313
• References...322
• A.2.3. Frequency dependence of non-sequential double ionization...328
• References...334
• A.3. Development of high power femtosecond laser technology...338
• A.3.1. Performance improvement of a 1 kHz femtosecond high-power laser...338
• References...343
• A.3.2. Electric-field recovery of sub-10-fs laser pulses from intergerometric autocorrelation using an evolutionaty strategy...347
• References...356
• A.3.3. Measurement of shot-to-shot carrier-envelope phase ship of femtosecond laser pulses...361
• References...370
• A.3.3. Temporal characterization of femtosecond laser pulsed using spectral phase interferometry for direct electric-field reconstruction (SPIDER)...241
• References...246