Ali Khalatpour
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View article: Roughness-Limited Performance in Ultra-Low-Loss Lithium Niobate Cavities
Roughness-Limited Performance in Ultra-Low-Loss Lithium Niobate Cavities Open
Achieving low optical loss is critical for scaling complex photonic systems. Thin-film lithium niobate (TFLN) offers strong electro-optic and nonlinear properties in a compact platform, making it ideal for quantum and nonlinear optics. Whi…
View article: Surface and Bulk Two-Level System Losses in Lithium Niobate Acoustic Resonators
Surface and Bulk Two-Level System Losses in Lithium Niobate Acoustic Resonators Open
Lithium niobate (LN) is a promising material for building acoustic resonators used in quantum applications, but its performance is limited by poorly understood material defects called two-level systems (TLS). In this work, we fabricate hig…
View article: A Tunable Unidirectional Source for GUSTO’s Local Oscillator at 4.74 THz
A Tunable Unidirectional Source for GUSTO’s Local Oscillator at 4.74 THz Open
The Galactic/Extra Ultra long Duration Balloon Spectroscopic-Stratospheric Terahertz Observatory (GUSTO), is a NASA balloon-borne project and is scheduled for launch in late 2022. The balloon will carry a spectroscopic telescope that will …
View article: 3.9 THz spatial filter based on a back-to-back Si-lens system
3.9 THz spatial filter based on a back-to-back Si-lens system Open
We present a terahertz spatial filter consisting of two back-to-back (B2B) mounted elliptical silicon lenses and an opening aperture defined on a thin gold layer between the lenses. The beam filtering efficiency of the B2B lens system is i…
View article: 81 supra-THz beams generated by a Fourier grating and a quantum cascade laser
81 supra-THz beams generated by a Fourier grating and a quantum cascade laser Open
Large heterodyne receiver arrays (~100 pixel) allow astronomical instrumentations to map more area within limited space mission lifetime. One challenge is to generate multiple local oscillator (LO) beams. Here, we succeeded in generating 8…