Molecular fingerprint-region spectroscopy from 5-12 \mu m using an orientation-patterned gallium phosphide optical parametric oscillator

TL;DR

This paper introduces a novel femtosecond optical parametric oscillator based on orientation-patterned gallium phosphide, capable of broadband spectroscopy in the molecular fingerprint region, enabling new applications in chemical analysis.

Contribution

The first broadband OPO operating across 5-12 μm using OP-GaP, demonstrating high-repetition-rate femtosecond pulses for molecular spectroscopy.

Findings

Successful generation of 5-12 μm femtosecond pulses

First broadband OPO in the molecular fingerprint region

Effective spectroscopy of water vapor and polystyrene

Abstract

We report a femtosecond optical parametric oscillator (OPO) based on the new semiconductor gain material orientation patterned gallium phosphide (OP-GaP), which enables the production of high-repetition-rate femtosecond pulses spanning 5-12 \mu m with average powers in the few to tens of milliwatts range. This is the first example of a broadband OPO operating across the molecular fingerprint region, and we demonstrate its potential by conducting broadband Fourier-transform spectroscopy using water vapor and a polystyrene reference standard.