Using a cat's eye cavity to improve displacement self-sensing laser

Du, Wei; Li, Yan; Zhang, Shulian; Suo, Rui; Wan, Xia

doi:10.1016/j.sna.2005.04.007

Cited by 11 publications

(8 citation statements)

References 12 publications

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“…(1) Laser nanometer ruler [2] (2) Displacement sensor based on the feedback of HeNe dual frequency lasers [3] (3) Compact displacement sensor based on the birefringent external cavity feedback of microchip Nd:YAG lasers [4, 5] (4) Waveplate phase retardation measurement instrument based on frequency splitting [6,7] (5) Waveplate phase retardation measurement instrument based on optical feedback [8] (6) Quasi-common-path Nd:YAG laser feedback interferometer [9] (7) Nd:YAG laser feedback confocal frofilometry…”

Section: Laser Feedback Associate With External Cavity Tuningmentioning

confidence: 99%

Measurement technology based on laser internal/external cavity tuning

Zhang

2011

SPIE Proceedings

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For an ordinary laser with two cavity mirrors, if the length of laser cavity changes half wavelength the laser frequency changes one longitudinal mode separation. For a laser with three cavity mirrors, in which a feedback mirror is used to feed part of the laser output beam back into the laser cavity, the external cavity length changes half wavelength the laser intensity fluctuates one period. This presentation gives some research results in measurement field based on changing (tuning) the length of laser internal/external cavity, including 1) HeNe laser cavity-tuning nanometer displacement measurement instruments (laser nanometer rulers), 2) HeNe laser feedback displacement measurement, 3) Nd:YAG laser feedback nanometer displacement measurement, 4) benchmark of waveplate phase retardation measurement based on laser frequency splitting, 5) in-site waveplate phase retardation measurement instruments based on laser feedback and polarization hopping, 6) quasi-common-path microchip Nd:YAG laser feedback interferometer, 7) non-contact Nd:YAG laser feedback surface profile measurement. Some of these instruments have been put into application and display some irreplaceable advantages.

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Section: Laser Feedback Associate With External Cavity Tuningmentioning

confidence: 99%

Measurement technology based on laser internal/external cavity tuning

Zhang

2011

SPIE Proceedings

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“…But the attempt that a laser itself is a sensor used to measure displacement did not succeed. Zhang and his colleagues [5] created such a laser nanometer displacement ruler, also called a displacement self-sensing laser, using a 120-mm-long HeNe laser with a plate of quartz crystal in the cavity.…”

Section: Laser Nanometer Rulermentioning

confidence: 99%

Orthogonally polarized dual frequency lasers and applications in self-sensing metrology

Zhang

Tan

2010

Meas. Sci. Technol.

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The traditional Zeeman laser (Z-laser) outputs a frequency difference generally smaller than 2MHz, which has limited its applications. An orthogonally polarized laser is capable of outputting two frequencies with a 90-angle between their polarization directions. The difference between the two frequencies may range from 1MHz to 1GHz, determined by the birefringence within the resonance cavity of the laser. Because it is easy to adjust the frequency difference and to detect the intensities of the two frequencies separately, a number of unknown characteristics are observed in cavity tuning and optical feedback. These properties have turned and will turn into the working principles of self-sensing metrology instruments. That is to say that an orthogonally polarized laser, in addition to serve as a light source of a dual frequency laser, may be changed into a metrological apparatus. It has selfsensing ability, namely laser itself is just the instrument, e.g. nanometer displacement based on laser cavity tuning or feedback effects, retardation of a wave-plate based on frequency splitting or feedback effects, and non-contact high resolution laser feedback interferometer.

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“…In recent years, we have utilized the CER, which has a better property of retro-direction reflection than traditional reflection mirrors, to form He-Ne laser resonators and realized major improvement in laser stability [9,10]. The CER we used is composed of a convex lens and a concave mirror, as shown in figure 3, while the focal length of the convex lens f is designed to be equal to the radius of curvature of the concave mirror r, as well as the distance between the convex lens and concave mirror l. During our research, we find that the CER has a strong influence on laser transverse modes output [11].…”

Section: The Apparatusmentioning

confidence: 99%

A simple laser teaching aid for transverse mode structure demonstration

Ren¹,

Zhang²

2009

Eur. J. Phys.

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A teaching aid for demonstrating the transverse mode structure in lasers is described. A novel device called 'multi-dimension adjustable combined cateye reflector' has been constructed from easily available materials to form a He-Ne laser resonator. By finely adjusting the cat-eye, the boundary conditions of the laser cavity can be altered, which allows the transverse modes output by laser to be conveniently modulated. Equipped with a CCD imaging system, this apparatus allows more than 20 laser transverse modes to be visualized on the computer screen, provided a valuable teaching aid at an undergraduate level.

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Using a cat's eye cavity to improve displacement self-sensing laser

Cited by 11 publications

References 12 publications

Measurement technology based on laser internal/external cavity tuning

Measurement technology based on laser internal/external cavity tuning

Orthogonally polarized dual frequency lasers and applications in self-sensing metrology

A simple laser teaching aid for transverse mode structure demonstration

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