Phase-synchronous detection of coherent and incoherent nonlinear signals

Khadga Jung Karki; Loni Kringle; Andrew H. Marcus; Tõnu Pullerits

doi:10.1088/2040-8978/18/1/015504

Phase-synchronous detection of coherent and incoherent nonlinear signals

Khadga Jung Karki, Loni Kringle, Andrew H. Marcus, Tõnu Pullerits

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

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 φ₁ and φ₂, respectively, nonlinear signals can be isolated at the frequencies n (φ₂-φ₁), where n = 0, 1, 2, ⋯. This approach holds promise for performing nonlinear spectroscopic measurements under low-signal conditions.

Original language	English
Article number	015504
Journal	Journal of Optics (United Kingdom)
Volume	18
Issue number	1
DOIs	https://doi.org/10.1088/2040-8978/18/1/015504
State	Published - 20 Nov 2015
Externally published	Yes

Keywords

nonlinear optics
phase-modulation
ultrafast optics

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10.1088/2040-8978/18/1/015504

Cite this

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abstract = "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 φ1 and φ2, respectively, nonlinear signals can be isolated at the frequencies n (φ2-φ1), where n = 0, 1, 2, ⋯. This approach holds promise for performing nonlinear spectroscopic measurements under low-signal conditions.",

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AU - Karki, Khadga Jung

AU - Kringle, Loni

AU - Marcus, Andrew H.

AU - Pullerits, Tõnu

PY - 2015/11/20

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N2 - 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 φ1 and φ2, respectively, nonlinear signals can be isolated at the frequencies n (φ2-φ1), where n = 0, 1, 2, ⋯. This approach holds promise for performing nonlinear spectroscopic measurements under low-signal conditions.

AB - 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 φ1 and φ2, respectively, nonlinear signals can be isolated at the frequencies n (φ2-φ1), where n = 0, 1, 2, ⋯. This approach holds promise for performing nonlinear spectroscopic measurements under low-signal conditions.

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Phase-synchronous detection of coherent and incoherent nonlinear signals

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Keywords

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