Wavelength scanning interferometry using a Ti:Sapphire laser with wide tuning range

Wavelength scanning interferometry using a Ti:Sapphire laser with wide tuning range
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使用具有宽调谐范围的钛蓝宝石激光器进行波长扫描干涉测量

DOI:
10.1016/j.optlaseng.2012.02.005
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发表时间:
2012
影响因子:
4.6
通讯作者:
Davila A
Davila A
中科院分区:
工程技术2区
文献类型:
--
作者:
Davila A

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可见光或近红外波长扫描干涉测量通常仅限于相对较窄的波长调谐范围,与扫描白光干涉测量等相关技术相比,这导致深度分辨率较差。我们描述了如何定制扫描范围大于 100 nm 的市售 Ti:Sapphire 激光器,以允许以高达 30framess−1 的速率高速扫描数万帧,并采用可变曝光时间来补偿激光功率输出和相机灵敏度的波长变化。扫描中的模式跳跃和其他非线性阻碍了通过时间傅里叶变换的标准方法成功进行深度重建,通过测量一组四个楔块的干涉图中的相位变化,并对均匀间隔的波数向量上的强度信号进行重新采样来处理。通过这些改变,深度分辨率提高了 100 倍以上,并且接近扫描范围高达 37 nm 的理论极限。
Wavelength scanning interferometry in the visible or near-infra red is normally restricted to relatively narrow wavelength tuning ranges, which results in poor depth resolution compared to related techniques such as scanning white light interferometry. We describe how a commercially-available Ti:Sapphire laser with>100nm scan range has been customized to allow high speed scans of several tens of thousands of frames at rates of up to 30framess−1, with variable exposure time to compensate for wavelength variation of laser power output and camera sensitivity. Mode hops and other nonlinearities in the scans, which prevent successful depth reconstructions by the standard approach of temporal Fourier transformation, are handled by measuring phase changes in the interferograms from a set of four wedges, and resampling the intensity signals on a uniformly-spaced vector of wavenumbers. With these changes, the depth-resolution is improved by a factor of more than 100x, and is found to approach the theoretical limit for scan ranges of up to 37nm.
DOI: 10.1364/ao.51.000558
发表时间: 2012-02
期刊: Applied optics
影响因子: 1.9
作者:
Abundio Davila;J. M. Huntley;C. Pallikarakis;Pablo D. Ruiz;J. Coupland
通讯作者: Abundio Davila;J. M. Huntley;C. Pallikarakis;Pablo D. Ruiz;J. Coupland
光学相干断层扫描中扫频源的相位计算:抖动影响
DOI: 10.1016/j.optlaseng.2011.01.026
发表时间: 2011
影响因子: 4.6
作者:
G. Moreno;N. Ochoa
通讯作者: N. Ochoa
DOI: 10.1088/0957-0233/18/11/016
发表时间: 2007-11-01
影响因子: 2.4
作者:
Tomlins, Peter H.;Wang, Ruikang
通讯作者: Wang, Ruikang
DOI: --
发表时间: 2011
期刊:
影响因子: --
作者:
J. M. Huntley;P. D. Ruiz
通讯作者: P. D. Ruiz