Influence of ring-down cavity parameters on intensity transmission property in trace gas concentration measurement

Abstract

In this paper, we describe the basic principles and system design of continuous wave cavity ring-down spectroscopy (CWCRDS). We also particularly study the nature and the behavior of a novel method to detune a laser and apply it to a cavity ring-down spectroscopy experiment. Both simulations and experiments are completed on the relation between the transmission characteristic and different reflectivities, as well as scanning speed. Output electric field equation is deduced. It has been investigated that how photons are coupled to the cavity and how to accumulate the intensity and leak out of the cavity as a function of time. It is noted that both accumulation of intensity and decay times decrease, and the oscillation amplitude increases as the reflectivity increases. Relative intensity increases with decreasing scanning velocity. Additionally, the simulations show that a non-detuned cavity displays the transmitted signals which are highly dependent on the mirror reflectivity and piezoelectric translator (PZT) modulation speed. Simulations also display that the laser switching off is different from detuning.

Keywords

Cavity Mode / Cavity Length / Transmitted Intensity / Modulate Speed / Oscillation Amplitude Increase

References

[1] O’KeefeA., DeaconD. A. G.. Review of Scientific Instruments, 1988, 59: 2544

[2] HemerikM. M.. Design of a Mid-infrared Cavity Ring down Spectrometer, 2001, Netherlands, EU, Eindhoven University of Technology

[3] J. Remy, A. H. F. M. Baede, G. H. J. M. Groothuis, W. W. Stoffels and G. M. W. Kroesen, In-situ Infrared Cavity Ringdown Spectroscopy of a Capacitively Coupled RF Ar/SiH4 Dusty Plasma, 31st EPS Conference on Plasma Phys 9, (2004).

[4] JangJ., BaeJ.. Sensor and Actuators B, 2007, 122: 7

[5] YongS. K., HaS. C., YangH., KIMY. T.. Sensor and Actuators B, 2007, 122: 211

[6] TobiasD. E., PerlingerA. Judith., MorrowS. Patrick., DoskeyP. V., PerramD. L.. Journal of Chormatography A, 2007, 1140: 1

[7] HoH. L., HooY. L., JinW., JuJ., WangD. N., WindelerR. S., LiQ.. Sensor and Actuators B, 2007, 112: 289

[8] AnthonyO., DeaconD. A. G.. Review of Scientific Instruments, 2009, 59: 2544

[9] Jongma RienkT., MaartenB., Holleman IwanG. H., GerardM.. Review of Scientific Instruments, 2009, 66: 2821

[10] CrossonE. R.. Appl. Phy. B: Lasers and Optics, 2008, 92: 403

[11] ThorpeM. J., Balslev-ClausenD., KirchnerM. S., YeJ.. Optics Express, 2008, 16: 2387

[12] HahnJ. W., YooY. S., LeeJ. Y., KimJ. W., LeeH. W.. Applied Optics, 1999, 38: 1859

This work has been supported by the National Natural Science Foundation of China (No.60877047), the Natural Science Foundation of Hebei Province (No.F2008000873), and the Research Fund for the Doctoral Program of Higher Education (No.20070216004).