Compact optical scheme for the generation of ultrafast mid-IR laser pulses

Rajput, Vinod K.; Jana, P. K.; Ponnan, Sajin; Taher, Md Abu; Naraharisetty, Sri Ram G.

doi:10.1007/s12043-022-02426-8

Cited by 3 publications

(2 citation statements)

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“…Two optical parametric amplifiers are pumped with a fundamental beam, and one optical parametric amplifier (OPA) output is used for the generation of a visible pulse either at 2.5 eV (500 nm) or 1.9 eV (650 nm), which is used as pump pulses in these experiments. Another OPA output is used as a tunable signal and idler source, used as input for a home-built difference frequency generation (DFG) setup to generate tunable mid-IR pulses . In the current work, we used 0.62 eV (2000 nm) and 0.31 eV (4000 nm) output from this DFG.…”

Section: Methodsmentioning

confidence: 99%

“…Another OPA output is used as a tunable signal and idler source, used as input for a home-built difference frequency generation (DFG) setup to generate tunable mid-IR pulses. 47 In the current work, we used 0.62 eV (2000 nm) and 0.31 eV (4000 nm) output from this DFG. The delay between the pump and probe beam is controlled using a motorized delay stage with 0.1 μm repeatability from Aerotech.…”

Section: Ultrafast Visible Pumpmentioning

confidence: 99%

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Anisotropic Nonradiative Recombination of Carriers in a Few-Layered MoS₂ Probed by Mid-IR Ultrafast Spectroscopy

et al. 2023

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Futuristic optoelectronic devices could be replaced by promising extremely thin layered transition-metal dichalcogenides (TMDCs) like MoS 2 . Often the efficiencies of TMDCs devices directly depend on the nonradiative decay dynamics of the carriers. The energy dissipation pathways are mainly mediated by defect states, and these detailed mechanisms are not entirely understood. Only low-energy mid-IR probes can reveal the carrier population dynamics near the band edge and the defect states. With ultrafast visible pump and mid-IR probe spectroscopy, carrier dynamics on chemical vapor deposition grown 3-to 4-layered MoS 2 system is presented. We optically pumped this system with energies at near bandgap 1.9 eV and at continuum 2.5 eV separately, while the excited nonequilibrium dynamics of carriers are probed with both 0.62 and 0.31 eV mid-IR pulses. Contrasting carrier dynamics are revealed at these probe wavelengths, and their dynamics is discussed in detail. Also, pump-power-dependent dynamics and polarization anisotropy at both pump wavelengths and at both probe wavelengths are presented. In all the cases, we obtained the carrier−carrier scattering time in the order of 2 to 3 ps and the carrier recombination time in the order of tens of picoseconds. Interestingly for the first time, we report the polarization anisotropic slow decay time constants when probed at 0.62 eV, which is not present for a 0.31 eV probe energy. Our experiments gave an intricate understanding of the defect-mediated carrier dynamics in a 3-to 4-layered MoS 2 system, where such defect states dictate the optoelectronic properties of TMDs.

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Section: Methodsmentioning

confidence: 99%

Section: Ultrafast Visible Pumpmentioning

confidence: 99%

Anisotropic Nonradiative Recombination of Carriers in a Few-Layered MoS₂ Probed by Mid-IR Ultrafast Spectroscopy

et al. 2023

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Excited state energy relaxation dynamics in near-infrared dye via transient absorption spectroscopy

Ponnan,

Mangalassery,

Desai

et al. 2024

J Opt

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Carrier dynamics of excited state absorption in germanium using Mid-IR probe pulses

Rajput,

Taher,

Jana

et al. 2024

Optical Materials

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Compact optical scheme for the generation of ultrafast mid-IR laser pulses

Cited by 3 publications

References 31 publications

Anisotropic Nonradiative Recombination of Carriers in a Few-Layered MoS₂ Probed by Mid-IR Ultrafast Spectroscopy

Anisotropic Nonradiative Recombination of Carriers in a Few-Layered MoS₂ Probed by Mid-IR Ultrafast Spectroscopy

Excited state energy relaxation dynamics in near-infrared dye via transient absorption spectroscopy

Carrier dynamics of excited state absorption in germanium using Mid-IR probe pulses

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Compact optical scheme for the generation of ultrafast mid-IR laser pulses

Cited by 3 publications

References 31 publications

Anisotropic Nonradiative Recombination of Carriers in a Few-Layered MoS2 Probed by Mid-IR Ultrafast Spectroscopy

Anisotropic Nonradiative Recombination of Carriers in a Few-Layered MoS2 Probed by Mid-IR Ultrafast Spectroscopy

Excited state energy relaxation dynamics in near-infrared dye via transient absorption spectroscopy

Carrier dynamics of excited state absorption in germanium using Mid-IR probe pulses

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Product

Resources

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Anisotropic Nonradiative Recombination of Carriers in a Few-Layered MoS₂ Probed by Mid-IR Ultrafast Spectroscopy

Anisotropic Nonradiative Recombination of Carriers in a Few-Layered MoS₂ Probed by Mid-IR Ultrafast Spectroscopy