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|October 29, 2020

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This study introduces a terahertz spatial filter using silicon lenses to shape beams from quantum cascade lasers (QCLs). The filter effectively improves beam quality for terahertz applications.

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Area of Science:

Optics and Photonics
Terahertz Technology
Quantum Cascade Lasers

Background:

Quantum cascade lasers (QCLs) are crucial terahertz (THz) sources but often emit non-Gaussian beams.
Efficient beam shaping is necessary to adapt QCLs for applications like local oscillators.

Purpose of the Study:

To develop and evaluate a terahertz spatial filter for improving QCL beam quality.
To demonstrate the effectiveness of a back-to-back (B2B) elliptical silicon lens system for beam shaping.

Main Methods:

A terahertz spatial filter was designed using two back-to-back (B2B) elliptical silicon lenses with an aperture.
Simulations and experiments were conducted using a 3.86 THz distributed feedback (DFB) QCL as the source.
Beam transmissivity and Gaussicity were measured before and after filtering.

Main Results:

The B2B lens system achieved 72% experimental transmissivity with a Gaussian input, closely matching the simulated 80%.
The filter enhanced beam Gaussicity from 74% to 99% for the QCL's non-Gaussian output.
Transmissivity greater than 30% was achieved for the filtered, near-Gaussian beam.

Conclusions:

The B2B lens system is an effective beam shaping technique for terahertz QCLs.
This method enables QCLs to produce Gaussian beams suitable for local oscillator applications.
The B2B lens system is adaptable for a broad range of frequencies with appropriate scaling.