CC BY
10Sub-nanosecond light pulse generator based on FDML-laser
X. Yang1'2. R.V. Romashko1, J. Zhang2*
1-Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Science,
5 Radio Str., Vladivostok, Russia 2- Key Lab of In-Fiber Integrated Optics, Ministry Education of China, Harbin Engineering University,
Harbin 150001, China
Fourier-Domain Mode-Locked (FDML) laser represent a significant advancement in the fields of optical coherence tomography (OCT) and high-speed imaging applications [1]. Widely used in the detection of cancer, ophthalmology, and dermatological diseases [2-4]. FDML laser function as highspeed spectrometers in the time domain [5]. Ensuring the consistency between the cavity's fundamental frequency and the tunable filter's frequency across different wavelengths in the laser cavity is essential [6].
We address these challenges by using Fiber Bragg Gratings (FBG) for wavelength calibration to mitigate the inherent hysteresis and creep issues of the tunable filter, and dynamic PZT for dispersion compensation to counteract the dispersion caused by the kilometers-long fiber in the FDML system. These measures enable us to achieve a stable time-wavelength relationship and stable laser output. Additionally, we are developing an FDML laser-based bubble detection system and exploring its potential in marine resource development and medical isotope preparation.
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Fig. 1. (a) is the system installation diagram of FDML, and Fig. 1. (b) shows the wavelength calibration system of the FBG array, the hysteresis curve of the tunable filter, and the effect of temperature on the tunable filter. Fig. 1. (c) shows the solution of combining dynamic PZT and dispersion compensation fiber, the dispersion coefficient curves of 10.2km fiber and 1.023km dispersion compensation fiber, and the responsivity of PZT.
[1] R. Huber, M. Wojtkowski, J.G. Fujimoto, Fourier Domain Mode Locking (FDML): A new laser operating regime and applications for optical coherence tomography, Opt. Express 14(8), 3225-3237 (2006).
[2] R. Raghunathan, M. Singh, M.E. Dickinson, K.V. Larin, Optical coherence tomography for embryonic imaging: a review, J. Biomed. Opt. 21(05), 1 (2016).
[3] R.A. Leitgeb, En face optical coherence tomography: a technology review [Invited], Biomed. Opt. Express 10(5), 2177-2201 (2019).
[4] A. Zhang, Q. Zhang, C.-L. Chen, R.K. Wang, Methods and algorithms for optical coherence tomography-based angiography: a review and comparison, J. Biomed. Opt. 20(10), 100901 (2015).
[5] D. Huang, Y. Shi, F. Li, P.K.A. Wai, Fourier Domain Mode Locked Laser and Its Applications, Sensors 22(9), 3145 (2022).
[6] C. Jirauschek, B. Biedermann, R. Huber, A theoretical description of Fourier domain mode locked lasers, Opt. Express, 2009.
