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Lasers & Sources

Digital laser control and laser frequency stabilization


TOPTICA's DigiLock 110 is more than just the best digital solution for laser stabilization. It can additionally be used to computer control and analyze the laser digitally. The latest software version enables one computer to control up to four DigiLocks and a comprehensive interface is available for remote TCP/IP access to all functions.

The DigiLock 110 is a module for TOPTICA's SYS DC diode laser driving system. DigiLock's basic capabilities include multi channel oscilloscope functionality, control over laser frequency and frequency scan, two integrated PIDs (e.g. for feedback to Piezo and laser current), a Lock-In regulator, and Pound-Drever-Hall stabilization. Click & Lock, Lock-detection, Auto-Lock and Relock as well as simulation of controller parameters and network analysis are only a few examples of more advanced features.

The FPGA (field programmable gate array) based hardware makes the DigiLock flexible and at the same time very fast and enables its deployment in a wide range of applications. The unit features numerous inputs and outputs, up to 100 MHz sampling rate or up to 21 bit precision to perfectly match the user's needs. With a total delay time of less than 200ns, its digital locking bandwidth is several MHz and an FPGA controlled analog bypass allows for even higher bandwidths e.g. for laser linewidth reduction.

The DigiLock can now easily be integrated into complex experiments. It enables not only lock monitoring and control, but also adjustment of many laser parameters like laser current, temperature and scan offset.