Laser spectroscopy with a pulsed, narrowband infrared optical parametric oscillator system: a practical, modular approach

G. W. Baxter, H.-D. Barth, B. J. Orr*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

A pulsed optical parametric oscillator (OPO), based on bulk lithium niobate pumped at 1.064 μm and injection-seeded at ∼1.55 μm by a single-mode tunable diode laser, has been developed to serve as a narrowband coherent infrared spectroscopic source. The OPO cavity comprises a slightly misaligned three-mirror ring that is operated passively, to provide continuous tunability of the signal (∼1.55 μm) and idler (∼3.4 μm) output radiation over several cm-1 in a single scan. The potential of the OPO system for linear and nonlinear-optical spectroscopy is demonstrated by recording high-resolution photoacoustic absorption and coherent anti-Stokes Raman spectra of methane, as a gas and in a pulsed supersonic free jet. This narrowband tunable infrared source is shown to scan reliably with an optical bandwidth as small as 0.007 cm-1 (210 MHz) full width half maximum (fwhm), close to the fourier-transform limit.

Original languageEnglish
Pages (from-to)653-657
Number of pages5
JournalApplied Physics B: Lasers and Optics
Volume66
Issue number5
DOIs
Publication statusPublished - May 1998

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