頁籤選單縮合
題 名 | Cavity Ringdown Spectroscopy: New Approaches and Outcomes |
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作 者 | He,Yabai; Orr,Brian J.; | 書刊名 | Journal of the Chinese Chemical Society |
卷 期 | 48:3 2001.06[民90.06] |
頁 次 | 頁591-601 |
分類號 | 336 |
關鍵詞 | Cavity ringdown spectroscopy; Optical parametric oscillator; Injection seeding; Tunable diode laser; Optical heterodyne detection; Carbon dioxide; Rovibrational spectra; Near-infrared spectroscopy; Trace gas analysis; |
語 文 | 英文(English) |
英文摘要 | Cavity ringdown (CRD) absorption spectroscopy provides high sensitivity and photometric precision in the measurement of weak optical absorption spectra. We report several innovations in CRD technique involving either pulsed or continuous-wave (cw) tunable coherent sources. In the former case, we use narrowband, injection-seeded optical parametric oscillator (OPO) devices based on quasi phase-matched nonlinear-optical media and a novel intensity-dip cavity control scheme; one such pulsed OPO is pumped by a compact, inexpensive multimode laser but still delivers single-mode OPO signal output. The latter area concerns cw-CRD spectroscopy with a single-mode tunable diode laser (TDL) and a rapidly swept ringdown cavity, most recently enhanced by a novel optical heterodyne approach that yields a noise-limited absorption sensitivity of 3 �e 10-9 cm-1. Such pulsed and cw CRD methods are used to record weak rovibrational spectra of carbon dioxide gas (CO2) with high resolution in the 1.5-�慆 near-infrared region. Emphasis is on high-performance spectroscopic systems with relatively simple, inexpensive, compact instrumentation. |
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