Phase-synchronous detection of coherent and incoherent nonlinear signals
| Autor: | Andrew H. Marcus, Khadga Jung Karki, Tõnu Pullerits, Loni Kringle |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
business.industry Nonlinear optics 02 engineering and technology 021001 nanoscience & nanotechnology Laser Polarization (waves) 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Nonlinear system Optics law Harmonics 0103 physical sciences 010306 general physics 0210 nano-technology business Ultrashort pulse Phase modulation Excitation |
| Zdroj: | Journal of Optics. 18:015504 |
| ISSN: | 2040-8986 2040-8978 |
| DOI: | 10.1088/2040-8978/18/1/015504 |
| Popis: | The nonlinear optical response of a material system contains detailed information about its electronic structure. Standard approaches to nonlinear spectroscopy often use multiple beams crossed in a sample, and detect the wave vector matched polarization in transmission. Here, we apply a phase-synchronous digital detection scheme using an excitation geometry with two phase-modulated collinear ultrafast pulses. This scheme can be used to efficiently detect nonlinear coherent signals and incoherent signals, such as higher harmonics and multiphoton fluorescence and photocurrent, from various systems including a photocell device. We present theory and experiment to demonstrate that when the phase of each laser pulse is modulated at the frequency phi(1) and phi(2), respectively, nonlinear signals can be isolated at the frequencies n(phi(2) - phi(1)), where n = 0, 1, 2, ... . This approach holds promise for performing nonlinear spectroscopic measurements under low-signal conditions. (Less) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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