Determination of the Subpicosecond Laser Pulse Chirp in the Middle IR Range Based on the Fourth Harmonic Noncollinear Generation
- Authors: Hovhannisyan D.L.1, Vardanyan A.H.1, Hovhannisyan G.D.2
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Affiliations:
- National Institute of Metrology
- Yerevan State University
- Issue: Vol 53, No 2 (2018)
- Pages: 112-128
- Section: Article
- URL: https://journals.rcsi.science/1068-3372/article/view/228606
- DOI: https://doi.org/10.3103/S1068337218020032
- ID: 228606
Cite item
Abstract
A new method is proposed to determine the subpicosecond laser pulse chirp in the middle IR range at the central wavelength of 10 μm, based on the generation of the second-harmonic pulses both by the bandwidth-limited and frequency-modulated subpicosecond pulses and the subsequent noncollinear generation of the fourth-harmonic radiation by the corresponding second-harmonic pulses. The time dependences are given of the instantaneous frequency of the frequency-modulated second-harmonic pulse at the central wavelength of 5 μm, generated in the field of the frequency-modulated subpicosecond IR pulse, propagating in the negative uniaxial AgGaS2 crystal along the direction of 61°36′ relative to the optical axis. These results can be used in designing a nonlinear optical phase correlator to determine the phase and time profile of the subpicosecond laser pulse in the middle IR range.
Keywords
About the authors
D. L. Hovhannisyan
National Institute of Metrology
Author for correspondence.
Email: davidhl@ysu.am
Armenia, Yerevan
A. H. Vardanyan
National Institute of Metrology
Email: davidhl@ysu.am
Armenia, Yerevan
G. D. Hovhannisyan
Yerevan State University
Email: davidhl@ysu.am
Armenia, Yerevan