Stabilization of a channeled spectropolarimeter by self-calibration

Taniguchi, Atsushi; Oka, Koichi; Okabe, Hiroshi; Hayakawa, Masayuki

doi:10.1364/ol.31.003279

Cited by 64 publications

(14 citation statements)

References 4 publications

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“…The second feature of this interferometer is that the unwanted effect of temperature variation can be compensated by use of the so-called self-calibration technique originally developed for the channeled spectropolarimeter [6], [7]. Even though the interferometer has no spatial separation and thereby is immune to mechanical vibration, the phase shifts φ 1 (σ) − φ 2 (σ) and φ 1 (σ)+φ 2 (σ) can fluctuate due to another environmental perturbation, specifically the temperature fluctuation.…”

Section: Principlementioning

confidence: 99%

Robust Wavelength-Scanning Interferometer Based on Channeled Spectropolarimetry

Oka

2014

2014 International Symposium on Optomechatronic Technologies

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A robust wavelength-scanning interferometer is developed by combining a channeled spectroscopic polarization state generator (CSPSG) and a polarimetric common-path cyclical interferometer. Unlike standard configurations of wavelengthscanning interferometers, the present configuration requires no spatially separated optical paths to introduce the phase-or frequency-shift due to the wavelength scanning, and hence it is almost immune to mechanical vibration. In addition, the selfcalibration technique associated with the CSPSG allows us to effectively compensate the fluctuation due to temperature change.

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Section: Principlementioning

confidence: 99%

Robust Wavelength-Scanning Interferometer Based on Channeled Spectropolarimetry

Oka

2014

2014 International Symposium on Optomechatronic Technologies

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“…Both of these solutions complicate field deployment significantly. An alternative self-calibration technique has been developed in attempts to circumvent these thermal errors [8]. However, this calibration method does not provide for direct measurement of all CSP retarder phase values, leading to uncertainty in the calibration.…”

Section: Thermal Instabilitymentioning

confidence: 99%

“…The demodulation is obtained through a polarimetric calibration technique. The technique used in the report is known as the reference beam calibration technique [8], although another method does exist [8]. The reference beam calibration technique accounts for the phase modulations by using a known reference measurement.…”

Section: Introduction To Channeled Spectropolarimetrymentioning

confidence: 99%

Athermalized channeled spectropolarimeter enhancement.

Jones¹,

Way²,

Mercier³

et al. 2013

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Channeled spectropolarimetry can measure the complete polarization state of light as a function of wavelength. Typically, a channeled spectropolarimeter uses high order retarders made of uniaxial crystal to amplitude modulate the measured spectrum with the spectrally-dependent Stokes polarization information. A primary limitation of conventional channeled spectropolarimeters is related to the thermal variability of the retarders. Thermal variation often forces frequent system recalibration, particularly for field deployed systems. However, implementing thermally stable retarders, made of biaxial crystal, results in an athermal channeled spectropolarimeter that relieves the need for frequent recalibration. This report presents experimental results for an anthermalized channeled spectropolarimeter prototype produced using potassium titanyl phosphate. The results of this prototype are compared to the current thermal stabilization state of the art. Finally, the application of the technique to the thermal infrared is studied, and the athermalization concept is applied to an infrared imaging spectropolarimeter design.4

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“…To overcome this drawback, we employ the self-calibration technique. 16 Since the technique was originally developed for use with the CSPSA, we modified it for use with the CSE.…”

Section: B Temperature Dependence Of High-order Retardersmentioning

confidence: 99%

“…Specifically, F 1 ͑ ͒, F − ͑ ͒, and F + ͑ ͒ can be demodulated from P͑ ͒ by use of the Fourier transform method. 2,16 On the other hand, K 1 ͑i͒ ͑ ͒, K − ͑i͒ ͑ ͒, and K + ͑i͒ ͑ ͒ can be calibrated in advance to the measurement, since they only include the parameters independent of both the sample and the retardation variations. This implies that we can compute ␦ 1 ͑ ͒ from the channeled spectrum P͑ ͒ even when an unknown sample is placed.…”

Section: B Temperature Dependence Of High-order Retardersmentioning

confidence: 99%

Error-reduced channeled spectroscopic ellipsometer with palm-size sensing head

Okabe

Hayakawa

Matoba

et al. 2009

Review of Scientific Instruments

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This paper describes a newly developed prototype system of the channeled spectroscopic ellipsometer ͑CSE͒. The new system has a feature that the major systematic and random error sources of the previous CSEs are effectively reduced or compensated for. In addition, the prototype preserves the advantageous features of the CSE in that it has a palm-size sensing head and that its acquisition time is as fast as 20 ms. Its performance is experimentally examined by use of 12 films whose thicknesses are ranging approximately from 3 to 4000 nm. The film thicknesses measured by the new CSE show good agreements with the ones by the rotating-compensator spectroscopic ellipsometer. The stability of the film-thickness measurement of the new CSE against the temperature change from 5 to 45°C is less than 0.11 nm. The CSE can open up new applications of the spectroscopic ellipsometers in which the compactness, the simplicity, and the rapid response are important.

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Stabilization of a channeled spectropolarimeter by self-calibration

Abstract: A novel method to stabilize the channeled spectropolarimeter is de- 40• C.

Cited by 64 publications

References 4 publications

Robust Wavelength-Scanning Interferometer Based on Channeled Spectropolarimetry

Robust Wavelength-Scanning Interferometer Based on Channeled Spectropolarimetry

Athermalized channeled spectropolarimeter enhancement.

Error-reduced channeled spectroscopic ellipsometer with palm-size sensing head

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