Molecular spectroscopy with a terahertz quantum-cascade laser by illumination-induced frequency tuning

Alam, Tasmim; Wienold, Martin; Hübers, Heinz‐Wilhelm

doi:10.1109/irmmw-thz.2018.8510048

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…In recent years, driven by the development of optical computing technology, research on monolithic photonics and optoelectronic integration technology has gradually become a hot focus, with many studies being performed such as the development of integrated laser sources, the exploration of waveguide grating array wavelength division multiplexing (WDM) technology, and further understanding of optical and electrical components, such as optical modulators and couplers. − The innovation of WDM technology is a representative one. As traditional single input and output functions in chips are difficult to meet the needs of integrated optical circuits in the aspects of miniaturization and high efficiency, a rapid development of tunable laser research is urgently needed (shown in Figure a). , Common laser tuning technology currently takes a laser, a working medium, and the interaction between them as the main basis and gets results achieved through the modification of the working environment, the insertion of optical components, or the continuous variable radiation within a certain range generated by their interaction. − Compared with those methods, laser tuning based on the principle of variable-temperature Raman scattering is a very competitive technology.…”

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Laser Tuning in Layered h-BN Crystals

Ding

Zheng

Zhu

et al. 2021

J. Phys. Chem. Lett.

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Integrated optics shows great potential in the current optical communication systems, sensor technology, optical computers, and other fields. Tunable laser technology within a certain range is the key to achieving on-chip optical integration; to realize which, Raman scattering is a competitive method that can effectively transfer incident laser energy to optical phonons due to the photon−phonon interaction. Here, we take hexagonal boron nitride as the energy conversion medium, and based on the angle-resolved polarized Raman spectroscopy, it is found that when laser polarization vector e i ⊥ c axis, the spectrum obtains maximal scattering across the cross section and a minimal depolarization ratio. At room temperature, h-BN obtains an output signal with a wavelength of 522.8 nm and a full-width at half-maximum of 0.24 nm under the excitation of 488 nm pump laser, and the depolarization ratio is 0.09 (theoretically, it is 0, and this difference is due to experimental errors). And then, within the temperature range of 80∼420 K, the scattered light wavelength shows a high-precision shift of 0.006 nm/25 K, indicating that continuous wavelength tuning has been successfully achieved in h-BN.

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