LINTZ , Michel

Alors que les techniques de mesure de déplacements par interférométrie laser ont atteint leur maturité, la mesure des distances à très haute résolution/exactitude est plus délicate. Elle est pourtant indispensable, par exemple dans la mise en œuvre des instruments d'observation à haute résolution angulaire, où des chemins optiques de plusieurs...

Alors que les techniques de mesure de déplacements par interférométrie laser ont atteint leur maturité, la mesure des distances à très haute résolution/exactitude est plus délicate. Elle est pourtant indispensable, par exemple dans la mise en œuvre des instruments d'observation à haute résolution angulaire, où des chemins optiques de plusieurs...

Characterization of stray light at component level is now a well-established domain, with various techniques and excellent noise floors. The cheracterization of stray light at system level is more delicate, as the final equipment may not allow the implementation of a dedicated instrumentation for the stray light measurement.For the LISA space...

This paper describes the design of a unit called Tx Attenuating Photoreceiver (TAP), dedicated to the measuring and dumping of a 2 W beam with 300 mm diameter. This unit is a part of an instrumentation called Stray Light Optical Ground Segment Equipment for the test of the Interferometric Measurement System (IMS) of the LISA mission. The...

It is shown that the results presented in the above letter, and attributed by the authors to amplitude-to-phase conversion in the photodetector, do not originate in the photodetector under test, due to the power dependence observed. More recent results show that conversion effects with the same size and frequency dependence are observed in...

This poster describes the design of a unit called Tx Attenuating Photoreceiver (TAP), dedicated to the measuring and dumping of a 2 W beam with 300 mm diameter. This unit is part of an optical demonstrator which will be created for stray light testing in the LISA mission. The geometry of the instrument is studied to reduce the size of the beam,...

When implementing a diluted telescope with large dimensions, one has to reach the equal path condition to the different segments of the primary mirror. In this work we suggest a way to implement a fast laser ranging method able to provide the error signal, using phase detection of the microwave modulation of a laser beam.

Interferometry is often used as a means for providing high sensitivity measurements. But interferometric measurements can also be easily affected by coherent stray light. In many fields, a correct estimation of the amount of stray light is necessary to assess the system performances and to guide the choice of the correct design. The LISA (Laser...

International audience

We demonstrate a laser ranging scheme that uses a high-frequency modulated beam to achieve subnanometer precision by the combined use of interferometric and time-of-flight measurements. We first describe how the absolute distance is extracted from a two-mode interference signal. In particular, we show that the signal, which presents both...

Scattered light can disrupt heterodyne measurements in the ZIFO test bench for LISAmission. This study shows a method to find all possible scattering paths and calculate their power, confirming the feasibility of the system.

We demonstrate a laser ranging scheme that uses a high-frequency modulated beam to achieve subnanometer precision by the combined use of interferometric and time-of-flight measurements. We first describe how the absolute distance is extracted from a two-mode interference signal. In particular, we show that the signal, which presents both...

We present a simple two-mode telemetry procedure which eliminates cyclic errors, to allow accurate absolute distance measurements. We show that phase drifts and cyclic errors are suppressed using a fast polarization switch that exchanges the roles of the reference and measurement paths. Preliminary measurements obtained using this novel design...

A laser ranging method is described that uses the phase of an amplitude-modulated laser beam: the frequency of the modulation is permanently adjusted to maintain a constant dephasing, and the distance is deduced from its measurement. We show that phase drifts and cyclic errors are suppressed using a fast polarization switch that interchanges...

We present a laser ranging system, under development, that uses a high frequency modulated beam to achieve sub-nm resolution by the combined use of interferometric and time-of-flight measurements. We first describe how the absolute distance is extracted from a two-mode interference signal. In particular we show that the signal, which presents...

Nous présentons deux télémètres basés sur un faisceau laser modulé en amplitude à haute fréquence (HF). L'information de distance est extraite de la phase du faisceau renvoyé par la cible. Dans la première mise en oeuvre proposée, l'erreur cyclique associée à une diaphonie optique entre la voie de référence et la voie de mesure est absente,...

We present a laser ranging system, under development, that uses a high frequency modulated beam to achieve sub-nm resolution by the combined use of interferometric and time-of-flight measurements. We first describe how the absolute distance is extracted from a two-mode interference signal. In particular we show that the signal, which presents...

Absolute distance measurement with accuracy below the micron scale is important in astronomical optical interferometry. We present here an absolute laser rangefinder which relies on the detection of a two mode interference signal. We exploit the specific signature of the signal to extract both the interferometric and synthetic phase...

Les photodiodes rapides sont un composant crucial des dispositifs opto-microondes. Les défauts desphotodiodes (non-linéarités, diaphonies, couplages amplitude-phase, ?) interviennent à des degrésdivers dans les utilisations qui en sont faites pour transformer en un photocourant les informationstransportées par le faisceau. Le couplage AM-PM est...

High accuracy and low noise measurement of the phase of a microwave signal requires that spurious contributions are adequately dealt with. In this paper we investigate the power-to-phase coupling in two commercial high bandwidth P-I-N, near-IR photodetectors. We observe that a sudden change of the optical power induces a transient of the phase...

We investigate the power-to-phase coupling in two commercial high bandwidth P-i-N near-IR photodetectors. We observe that a sudden change of the optical power induces a transient of the phase of the 20 GHz signal, at different time scales. The temperature rise of the photodetector junction is likely to be involved in this dynamical behaviour....

Le vol en formation de satellites et l'alignement des collisionneurs de particules sont deux domainesoù la mesure de distance doit être faite avec une haute résolution et une haute exactitude.L'interférence hétérodyne utilisée pour les mesures de déplacement atteint des résolutions subnanométriques,mais il s'agit d'une mesure de phase: elle...

A novel laser ranging method is described that uses a two-mode laser source, and detection of the phase of the return beam. The design eliminates the cyclic error usually associated with phase measurements and provides unambiguous, absolute distance determination. Measurements of an 8m path are obtained at a beat frequency of 13 GHz. We analyse...

Dans ce travail, nous mettons en évidence l'influence d'une modulation de phase anti-Brillouin sur la gigue temporelle d'un train d'impulsions picosecondes généré par compression non-linéaire d'un battement sinusoïdal au sein d'une fibre optique.

We present two different laser ranging systems under development, both based on the use of a high frequency modulated beam. The first range meter makes no use of interferometry: only the phase of the return beam is detected, in a way that rejects cyclic errors due to optical and electronic crosstalk. An Allan deviation slightly better than 10nm...