For processing signals in the time area an efficient tool is the acousto-optic delay line (AODL). The smoothly controlled delay of signals in a broad time interval permits to build high-performance radiolocation simulators. In the work, the design of the AODL has been considered, and the parameters, determining the limit of using its potential have been noted. The features of photoelastic interaction in AODL have been considered for the case when the duration of the input pulse is shorter than the time of crossing the optical beam by an elastic wave packet. It has been found that under these conditions the duration of the output response is determined by the time of crossing the optical beam by an elastic wave packet and does not depend on the duration of the input action. It has been shown that the AODL response to the input action in the form of a rectangular pulse is determined as the sum of three terms. In this case, the process of the entry of the elastic wave packet into the optical beam determines the first term, the second one - by the process of propagation of the elastic wave packet in the optical beam aperture, and the third - by the process of the exit of the elastic wave packet from the optical beam aperture. The corresponding equations have been obtained for calculating the pulse parameters at the AODL output. It has been shown that for a sufficiently short input pulse duration, the output signal parameters contain the information on the energy-geometric characteristics of the laser radiation. The results of numerical simulation have been tested experimentally on AODL layout with the direct detection. A comparative analysis of the results of theoretical and experimental studies have unambiguously has confirmed that AODL can also be used at frequencies above the cutoff frequency, both in terms of its main functional purpose and for solving a number of other engineering problems.
1. Shakin O.V., Nefedov V.G., Churkin P.A. Aplication of acoustooptics in electronic de-vices // Proc. of Conference «2018 Wave Electronics and its Application in Information and Tel-ecommunication Systems» (St. Petersburg, RUSSIA, Nov. 26–30, 2018). St. Petersburg. 2018. P. 1–4. DOI: 10.1109/WECONF.2018.8604351
2. Yushkov K.B., Molchanov V.Ya., Ovchinnikov A.V., Chefonov O.V. Acousto-optic rep-lication of ultrashort laser pulses // Physical Review. 2017. Vol. 96. Iss.4. P. 043866. DOI: 10.1103/PhysRevA.96.043866
3. Rapid-scan acousto-optical delay line with 34 kHz scan rate and 15 as precision / O. Schubert, M. Eisele, V. Crozatier et al. // Optics Letters. 2013. Vol. 38. P. 2907–2910. DOI: 10.1364/OL.38.002907
4. In-line femtosecond common-path interferometer in reflection mode / J. Chandezon, J.-M. Rampnoux, S. Dilhaire et al. // Optics Express. 2015. Vol. 23. P. 27011–27019. DOI: 10.1364/OE.23.027011
5. Okon-Fafara M., Kawalec A.M., Witczak A. Radar air picture simulator for military ra-dars // XII Conference on Reconnaissance and Electronic Warfare Systems. Proc. of SPIE. 2019. Vol. 11055. P. 1105519. DOI: 10.1117/12.2525032
6. Diewald A.R., Steins M., Müller S. Radar target simulator with complex-valued delay line modeling based on standard radar components // Advances in Radio Science. 2018. Vol. 16. P. 203–213. DOI: 10.5194/ars-16-203-2018
7. Гасанов А.Р., Гасанов Р.А., Ахмедов Р.А., Агаев Э.А. Временные и частотные ха-рактеристики акустооптической линии задержки с прямым детектированием // Измери-тельная техника. 2019. № 9. C. 46–52. DOI: 10.32446/0368-1025it.2019-9-46-52
8. Гасанов А.Р., Гасанов Р.А. Некоторые особенности практической реализации акустооптической линии задержки с прямым детектированием // ПТЭ. 2017. № 5. C. 112–115. DOI: 10.7868/S0032816217050081
9. Christopher C.D. Lasers and electro-optics. Cambridge University Press, 2014. 820 p. DOI: 10.1017/CBO9781139016629
10. Lee J.N., Van der Lugt A. Acousto-optic signal processing and computing // Proceedings of the IEEE. 1989. Vol. 77. No. 10. Р. 158–192.