Spectroscopic diagnostics of chemical processes: applications of tunable optical parametric oscillators

被引：0
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作者：
G.W. Baxter
M.A. Payne
B.D.W. Austin
C.A. Halloway
J.G. Haub
Y. He
A.P. Milce
J.F. Nibler
B.J. Orr
机构：
[1] Department of Chemistry and Centre for Lasers & Applications,
[2] Macquarie University,undefined
[3] Sydney,undefined
[4] NSW 2109,undefined
[5] Australia (Fax: +61-2/9850-8313,undefined
[6] E-mail: brian.orr@mq.edu.au),undefined
[7] Macquarie University Visiting Research Fellow,undefined
[8] 1998; permanent address: Chemistry Department,undefined
[9] Oregon State University,undefined
[10] Corvallis,undefined
[11] Oregon 97331-9800,undefined
[12] USA (Fax: +1-541/737-2062,undefined
[13] E-mail: niblerj@chem.orst.edu),undefined
来源：
Applied Physics B | 2000年 / 71卷
关键词：
PACS: 33.20.-t; 42.62.Fi; 42.65.Yj;
D O I：
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中图分类号：
学科分类号：
摘要：
Optical parametric oscillator (OPO) and amplifier (OPA) devices are useful for spectroscopic sensing of chemical processes in laboratory, industrial, and environmental settings. This is particularly true of nanosecond-pulsed, continuously tunable OPO/OPA systems, for which we survey a variety of instrumental strategies, together with actual spectroscopic measurements. The relative merits of OPO wavelength control by intracavity gratings and by injection seeding are considered. A major innovation comprises an OPO with a ring cavity based on periodically poled lithium niobate (PPLN) and injection-seeded by a single-mode tunable diode laser (TDL). Active cavity control by an ‘intensity dip’ method yields an optical bandwidth ≤0.005 cm-1 (150 MHz), which compares favourably with the performance of advanced grating-tuned OPO/OPA systems. A novel adaptation of this TDL-seeded PPLN OPO employs a compact, inexpensive multimode pump laser, with which it is still possible to obtain continuously tunable single-mode signal output. Cavity ringdown (CRD) spectroscopy also figures prominently, with infrared (IR) CRD spectra from both grating-scanned and TDL-seeded OPOs reported. Finally, a tunable ultraviolet (UV) source, combining a TDL-seeded passive-cavity OPO and a sum-frequency generation stage, is developed for measurements of time-resolved IR-UV double resonance spectra of acetylene and UV laser-induced fluorescence spectra of nitric oxide.
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页码：651 / 663
页数：12
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