1 In situ wavefront distortion measurements Efim Khazanov, Anatoly Poteomkin, Anatoly Mal’shakov, Nikolay Andreev, Alexander Sergeev Institute of Applied.

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Presentation transcript:

1 In situ wavefront distortion measurements Efim Khazanov, Anatoly Poteomkin, Anatoly Mal’shakov, Nikolay Andreev, Alexander Sergeev Institute of Applied Physics, N.Novgorod, Russia March, 16, 2001 Core Optics Working Group Session LIGO-G Z

2 In situ wavefront distortion measurements – Introduction n I. Nonlinear Hartmann Sensor. n II. Polarization Phase-Modulation method. !New n III. Beam scanning technique. n IV. White Light In Situ Measurement Interferometer. – Conclusions

3 Nonlinear Hartmann Sensor. Idea. In linear electrodynamics the major limitation to measure wave front deviations angles comes from a finite size of the focal spot h=  /50 is achieved by an accurate measurement of the transverse beam distribution  /d - diffraction angle

4 Nonlinear Hartmann Sensor. Idea. How to get /1000 ? Use self-focusing to decrease the size of the focal spot At P=P critical a  0 and is determined by nonlinear medium properties a - size of self- focussing point nonlinear medium

5 Nonlinear Hartmann Sensor. Experimental setup with moving sample. X Y PC + DT HeNe laser, 2-Nd master oscillator, 3-single pulse selector, 4- /2, 5- /4, 6-Nd amplifier, 7– polarizer, 8,9,12,14-lenses, 10,11-pinholes, 13- bensen cell (L=40 cm), 15-attenuator, 16-CCD camera, 17- PC+Frame Grabber, 18- analog monitor, 19-sample.

6 Nonlinear Hartmann Sensor. Self-focusing points. difraction limited diameter

7 Nonlinear Hartmann Sensor. Results with moving sample. a b c

8 Polarization Phase-Modulation method. Idea. photo diode  mirror birefringence crystal Faraday modulator Digital voltmeter He-Ne laser polarizer First harmonic detector

9 Polarization Phase-Modulation method. First test.

10 Beam scanning technique. Idea. PC F Rotating mirror CW diode laser Sample CCD camera F F

11 Beam scanning technique. Noise measurements.

12 Beam scanning technique. First phase maps.

13 White Light In Situ Measurement Interferometer. Experimental setup. 1 - light source, 2 - objective, 3 - sample, 4 - ocular, 5 - measurement interferometer, 6 - unit for synchronization and control, 7 - CCD camera, 8 - PC computer, 9 - modulating mirror, 10 - adjusting mirror, 11, 13 - motors, 12 - wave front shaper

14 White Light In Situ Measurement Interferometer. First phase map.

15 Future research WLPMI, 2 - NHS, 3 - polarization technique Vacuum chamber CO 2 heating laser Sample Nd heating laser