Czasopismo | ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA | Rocznik 2016 - zeszyt 12

Closed-loop Laser Stabilization System

10.15199/13.2016.12.3

nr katalogowy: 102954
10.15199/13.2016.12.3

European XFEL project developed in Hamburg by Deutsches Elektronen-Synchrotron contains a linear accelerator capable of generating light pulses at extremely short wavelengths, which will enable observing short lasting phenomena at atomic scale. Mode -locked lasers are commonly used in such facilities. Laser diode driver (LDD) is a significant element in the beam monitoring system, which will be used in the XFEL laser. Its role is to provide constant current source, linear, noiseless, and accurate, that delivers exactly the current to the laser diode that it needs to operate for a particular application. To ensure stable power output to the laser diode, PI controller was implemented. The code of the PI routine was optimized to enable higher frequency of its execution, which should improve the regulation parameters. This paper presents the microprocessor-based laser diode driver that can be used for a free electron laser system. It focuses on the firmware based on a real-time operating system (RTOS) developed to provide good stability of PI regulation combined with high flexibility in terms of system control. Keywords: laser stabilization, real-time operating system, closed- loop, European XFEL.European X-Ray Free Electron Laser (E-XFEL) project is developed by Deutsches Elektronen-Synchrotron (DESY) located in Hamburg. It contains a linear accelerator capable of accelerating particles up to 17.5 GeV. The laser will be able to generate light pulses at the wavelengths of 0.5 to 6 A, which will make it possible to observe objects at the atomic scale [1]. The discussed system will be used for the purpose of this project. In accelerator facilities, especially free-electron lasers (FEL), the use of mode locked lasers, which can produce pulses of light of extremely small duration, for electro-optical diagnostics is very common [2, 3]. Figure 1 presents a schematic of an example setup of a system using a laser diode. This paper prese[...]

Bibliografia

[1] S. Choroba, 2002, “Design and status of the XFEL RF system," 2007 IEEE Particle Accelerator Conference (PAC), Albuquerque, NM, 2007, pp. 841-845.
[2] Richard W. Fox, Chris W. Oates, Leo W. Hollberg, “Experimental Methods In The Physical Sciences", Elsevier Science Vol. 40, pp. 1-10.
[3] Axel Winter, 2008, “Fiber Laser Master Oscillators for Optical Synchronization Systems", Hamburg, pp. 30-40.
[4] Paweł Plewiński, 2016 “Microprocessor-based Closedloop Laser Stabilization System", Łódź.
[5] Wavelength Electronics, 2016 “Laser Diode Drivers", http://www.teamwavelength.com, accessed 20.05.
[6] Freescale Semiconductor, 2013 “Data Sheet: Technical Data, K60 Sub-Family", Rev. 3.
[7] Freescale Semiconductor, 2015 “Freescale MQX™ RTOS User’s Guide", Rev. 14.
[8] Information Sciences Institute, 1981 “Transmission Control Protocol, Protocol Specification", California.
[9] CAN in Automation , “CAN Specification 2.0".
[Online] Available: http://www.can-cia.org/fileadmin/cia/specifications/ CAN20A.pdf
[10] Freescale Semiconductor, “Robust Over-the-Air Firmware Updates Using Program Flash Memory Swap on Kinetis Microcontrollers", Rev. 0, 2012.
[11] Saleae, 2015 “Saleae Logic Pro 8 USB Logic Analyzer".
[12] Marjamäki, Daniel. 2013 “Cppcheck: a tool for static C/C++ code analysis".

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