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| Pakistan Research Repository | Home |
Title of Thesis |
| Author(s) Javed Anwar |
| Institute/University/Department Details Department of Physics/ Quaid-i-Azam University, Islamabad |
| Session 1993 |
| Subject Physics |
| Number of Pages 128 |
| Keywords (Extracted from title, table of contents and abstract of thesis) quantum statistical properties, noise, optical amplifiers, quantum optical systems, added noise, squeezed vacuum, phase fluctuations, squeeze parameter, noise-free amplification, three level laser |
Abstract Quantum statistics of added noise in a two-photon linear amplifier is presented. The phase-sensitivity is introduced by preparing three-level atoms in a coherent superposition of atomic states. We have shown that, under certain conditions, the additive noise is squeezed whose squeezing parameter depends on the initial atomic variables. The effect of the 'squeezed vacuum' reservoir on the degenerate parametric oscillator is studied. It is shown that when ordinary vacuum is replaced by a 'squeezed vacuum', the maximum 50 percent limit of second order squeezing inside the cavity can be crossed. The photon distribution function for the intracavity field is obtained and it is shown that, under certain conditions, the photon statistics of the intracavity field is identical to an ideal two-photon squeezed state. A study of quantum phase fluctuations in a three-level laser in the 'squeezed vacuum' environment is presented. It is shown that the anisotropic distribution of the phase fluctuations associated with the 'squeezed vacuum' reservoir leads to the reduction in phase fluctuations created by the spontaneous emission. Under a stable phase locking condition the phase diffusion coefficient is obtained. It is shown that the phase diffusion coefficient depends on squeeze parameter. For larger value of squeeze parameter the phase diffusion coefficient vanishes. |
| Download Full Thesis |  996.1 KB |
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| S. No. | Chapter | Title of the Chapters | Page | Size (KB) |
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| 1 | 0 | Contents | 0 | 83.71 KB |
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| 2 | 1 | Introduction | 1 | 94.58 KB |
| 1.1 | Noise-Free Amplification | 2 | ||
| 1.2 | Coherence in Atomic Systems | 3 | ||
| 1.3 | Squeezed States of the Radiation Field | 5 | ||
| 1.4 | Outline of the Thesis | 7 | ||
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| 3 | 2 | Quantum Theory Of Linear Amplifiers | 10 | 140.47 KB |
| 2.1 | Introduction | 10 | ||
| 2.2 | Linear Amplification Process | 12 | ||
| 2.3 | Classification of the Amplifiers | 16 | ||
| 2.4 | Atomic System | 17 | ||
| 2.5 | Phase-Sensitive Amplification in a Degenerate Parametric Amplifier | 22 | ||
| 2.6 | Conclusion | 24 | ||
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| 4 | 3 | Quantum Statistical Properties Of Noise In A Phase-Sensitive Linear Amplifier | 26 | 186.14 KB |
| 3.1 | Introduction | 26 | ||
| 3.2 | Noise-Free Amplification in a Two-Photon Phase Sensitive Amplifier | 29 | ||
| 3.3 | Quantum Statistics of Added Noise Sensitive Linear Amplifier In a Phase representation | 44 | ||
| 3.4 | Conclusion | 47 | ||
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| 5 | 4 | Intracavity Field Squeezing In A Degenerate Parametric Oscillator | 49 | 187.76 KB |
| 4.1 | Introduction | 49 | ||
| 4.2 | Degenerate Parametric Oscillator | 52 | ||
| 4.3 | Fokker-Planck Equation and its Exact Steady-State Solution Using the Q Representation | 59 | ||
| 4.4 | Higher Ordered Steady-State Squeezing | 67 | ||
| 4.5 | Conclusion | 70 | ||
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| 6 | 5 | Quantum Phase Fluctuations In A Three Level Laser | 73 | 133.8 KB |
| 5.1 | Introduction | 73 | ||
| 5.2 | Density Matrix Equation of Motion | 75 | ||
| 5.3 | Conclusion | 88 | ||
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| 7 | 6 | Bibliography | 89 | 312.46 KB |
| 6.1 | Appendix A Reprint of "Effect of squeezing on the Degenerate Parametric Oscillator", Phys. Rev. A 45, 1804(1992) | 97 | ||
| 6.2 | Appendix B Reprint of "Quantum Statistical Properties of Noise in a Phase Sensitive Linear Amplifier", Phys. Rev. A 48, (1993) | 103 | ||
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