Mid-infrared spectroscopy with a broadly tunable thin-film lithium niobate optical parametric oscillator

• URL: http://arxiv.org/abs/2307.04199v1
• Date: Sun, 9 Jul 2023 15:08:35 GMT
• Title: Mid-infrared spectroscopy with a broadly tunable thin-film lithium niobate optical parametric oscillator
• Authors: Alexander Y. Hwang, Hubert S. Stokowski, Taewon Park, Marc Jankowski, Timothy P. McKenna, Carsten Langrock, Jatadhari Mishra, Vahid Ansari, Martin M. Fejer, and Amir H. Safavi-Naeini
• Abstract summary: Device generates 25 mW of mid-infrared light at 3.2 microns, offering a power conversion efficiency of 15%. We demonstrate the tuning and performance of the device by successfully measuring the spectra of methane and ammonia.
• Score: 45.82374977939355
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Mid-infrared spectroscopy, an important and widespread technique for sensing molecules, has encountered barriers stemming from sources either limited in tuning range or excessively bulky for practical field use. We present a compact, efficient, and broadly tunable optical parametric oscillator (OPO) device surmounting these challenges. Leveraging a dispersion-engineered singly-resonant OPO implemented in thin-film lithium niobate-on-sapphire, we achieve broad and controlled tuning over an octave, from 1.5 to 3.3 microns by combining laser and temperature tuning. The device generates > 25 mW of mid-infrared light at 3.2 microns, offering a power conversion efficiency of 15% (45% quantum efficiency). We demonstrate the tuning and performance of the device by successfully measuring the spectra of methane and ammonia, verifying our approach's relevance for gas sensing. Our device signifies an important advance in nonlinear photonics miniaturization and brings practical field applications of high-speed and broadband mid-infrared spectroscopy closer to reality.

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