Measurement method for optical retardation based on the phase difference effect of laser feedback fringes

Zhang, Peng; Liu, Ning; Zhao, Shijie; Tan, Yidong; Zhang, Shulian

doi:10.1364/ao.54.000204

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…By adding a birefringence component into the laser feedback cavity, the polarization states of the feedback light can be shifted and the laser output intensities in the two orthogonal directions with the phase difference can be modulated. [31][32][33][34] The birefringence components are usually in the form of wave plates or quartz crystals. When the birefringence component is put into the external cavity, the original external cavity forms two different physical external cavities.…”

Section: Polarization-shifted Feedbackmentioning

confidence: 99%

Laser feedback interferometry and applications: a review

Niu

2017

Opt. Eng

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The progress on laser feedback interferometry technology is reviewed. Laser feedback interferometry is a demonstration of interferometry technology applying a laser reflected from an external surface, which has features including simple structure, easy alignment, and high sensitivity. Theoretical analysis including the Lang-Kobayashi model and three-mirror model are conducted to explain the modulation of the laser output properties under the feedback effect. In particular, the effect of frequency and polarization shift feedback effects are analyzed and discussed. Various applications on various types of lasers are introduced. The application fields range from metrology, to physical quantities, to laser parameters and other applications. The typical applications of laser feedback technology in industrial and research fields are discussed. Laser feedback interferometry has great potential to be further exploited and applied.

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Section: Polarization-shifted Feedbackmentioning

confidence: 99%

Laser feedback interferometry and applications: a review

Niu

2017

Opt. Eng

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“…In Nd:YAG lasers, the phase difference between orthogonal polarization components signal of optical feedback can be observed, which is about twice as large as the phase retardation of the birefringent element [15]. Further research has shown that the feedback laser component perpendicular to the initial polarized laser oscillate, and this effect is accompanied by a slight change in the polarization state of the laser [16][17][18]. However, in lasers with an anisotropic medium,these phenomena-primarily polarization flipping and phase difference of LBF have only sometimes been studied.…”

Section: Introductionmentioning

confidence: 99%

Amplitude and phase modulation of optical feedback in a-cut Nd:YVO₄ laser with a birefringent external cavity

Deng¹,

Zhang²,

Shen³

et al. 2022

Laser Phys. Lett.

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Considering only the self-mixing interference taking place, the modulation effect of optical feedback in a single polarization a-cut Nd:YVO4 laser is presented. The output intensity of the laser with anisotropic gain medium is modulated with a wave plate (WP) in the external cavity. The rotation orientation and phase retardation of the WP regularly determinate the amplitude and phase of laser intensity fringe, because the feedback light component at the same polarization direction as the output laser can interact with the light field in the cavity. The corresponding theoretical model is established and the windowed Fourier transform method is utilized to quantitatively explain this phenomenon. By introducing the amplitude and phase modulation coefficients, comparisons of experimental results with simulation analysis show good consistency.

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“…Some scholars have studied some other methods such as laser feedback [14], laser frequency splitting [15], and Mueller matrix ellipsometry [16,17]. The laser feedback method measures the phase retardation by inserting the MWP between the laser and a feedback mirror to gain a polarization jump, and analyzing the relationship between the measurement signals' phase difference and MWP's phase retardation at resonance state.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement of phase retardation and fast axis azimuth of wave plate based on equivalent component and phase detection

Chen¹,

Ding²,

Yu³

et al. 2022

Meas. Sci. Technol.

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Wave plates (WPs) are key components in optical polarization systems whose phase retardations and fast axis azimuths should be determined accurately. At present many measurement methods are based on light intensity detection which is inevitably affected by light intensity fluctuations so that the measurement accuracy is limited. What’s more, quite a few methods cannot measure WPs’ fast axis azimuths simultaneously. In this paper a method of simultaneously measuring the phase retardation and fast axis azimuth of arbitrary WP is proposed, which is based on equivalent component and phase detection. A rotatable half wave plate (HWP) and a retroreflector are used and its effect is equivalent to measuring an equivalent WP whose phase retardation is twice that of the measured wave plate, which is equivalent to doubling the measurement resolution. Phase detection is used to process the signals which means the measurement accuracy is better than that by usual light intensity detection. What’s more, the presented method eliminates the angle positioning errors of birefringent components in principle which exists in many present WP measurement methods. Finally, the measurement system setup is simple as well as the measurement process. The measurement formulae are deduced and corresponding WP measuring system is established. The error analysis shows that the system measurement uncertainty is about 3.9′ for the phase retardation and 5” for the fast axis azimuth. Experiment results and comparisons of quarter WPs and HWPs show that the presented method is in good agreement with other method. The phase retardation measurement repeatability is also good with a standard deviation about 2′.

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Measurement method for optical retardation based on the phase difference effect of laser feedback fringes

Cited by 5 publications

References 24 publications

Laser feedback interferometry and applications: a review

Laser feedback interferometry and applications: a review

Amplitude and phase modulation of optical feedback in a-cut Nd:YVO₄ laser with a birefringent external cavity

Simultaneous measurement of phase retardation and fast axis azimuth of wave plate based on equivalent component and phase detection

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Measurement method for optical retardation based on the phase difference effect of laser feedback fringes

Cited by 5 publications

References 24 publications

Laser feedback interferometry and applications: a review

Laser feedback interferometry and applications: a review

Amplitude and phase modulation of optical feedback in a-cut Nd:YVO4 laser with a birefringent external cavity

Simultaneous measurement of phase retardation and fast axis azimuth of wave plate based on equivalent component and phase detection

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Amplitude and phase modulation of optical feedback in a-cut Nd:YVO₄ laser with a birefringent external cavity