Highly Efficient Tunable Picosecond Deep Ultraviolet Laser System for Raman Spectroscopy
Overview
Affiliations
We present a narrowband laser system tunable from 219 to 236 nm for deep ultraviolet (DUV) Raman spectroscopy. The demonstrated laser system produces 6.7 ps nearly transform-limited pulses with energy up to 0.36 µJ at 100 kHz repetition rate. The system consists of a two-stage optical parametric amplifier (OPA) of a narrowband continuous wave diode laser and subsequent frequency conversion to the DUV radiation. We achieve more than 300 mW in the signal wave using ${{\rm LiB}_3}{{\rm O}_5}$LiBO (LBO) and ${{\rm BaB}_2}{{\rm O}_4}$BaBO (BBO) crystals, with the total 2.7 W pump after the two-stage OPA. We reach 12% conversion efficiency of the OPA signal wave into the DUV radiation using type-I phase matching in the BBO crystal. Finally, we demonstrate the applicability of the system for DUV Raman spectroscopy by collecting a high dynamic range, high spectral resolution spontaneous Raman spectrum of air.
Biomedical optics applications of advanced lasers and nonlinear optics.
Marble C, Yakovlev V J Biomed Opt. 2020; 25(4):1-9.
PMID: 32329266 PMC: 7177183. DOI: 10.1117/1.JBO.25.4.040902.