Dual-frequency laser Doppler velocimeter for speckle noise reduction and coherence enhancement

被引：63

作者：

Cheng, Chih-Hao ^{[1
]}

Lee, Chia-Wei ^{[1
]}

Lin, Tzu-Wei ^{[1
]}

Lin, Fan-Yi ^{[1
]}

机构：

[1] Natl Tsing Hua Univ, Dept Elect Engn, Inst Photon Technol, Hsinchu 300, Taiwan

来源：

OPTICS EXPRESS | 2012年 / 20卷 / 18期

关键词：

INJECTED SEMICONDUCTOR-LASER; VIBROMETRY; DYNAMICS; LIDAR;

D O I：

10.1364/OE.20.020255

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the characteristics of a dual-frequency laser Doppler velocimeter (DF-LDV) based on an optically injected semiconductor laser. The laser operated in a period-one (P1) dynamical state with two optical frequencies separated by 11.25 GHz is used as the dual-frequency light source. With a microwave beat signal carried by the light, the DF-LDV possesses both the advantages of good directionality, high intensity, and high spatial resolution from the light and low speckle noise and good coherence from the microwave, respectively. By phase-locking the two frequency components with a microwave signal, the coherence of the dual-frequency light source can be further improved and the detection range can be much extended. In this paper, velocity resolutions of the DF-LDV with different amounts of speckle noise and at different detection ranges are experimentally measured and analyzed. Compared with the conventional single-frequency LDV (SF-LDV), the velocity resolution of the DF-LDV is improved by 8x10(3) times from 2.5 m/s to 0.31 mm/s for a target with a longitudinal velocity v(z) - 4 cm/s, a transverse velocity v(t) - 5 m/s, and at a detection range of 108 m. (C) 2012 Optical Society of America

引用

页码：20255 / 20265

页数：11

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