A simple laser locking system based on a field-programmable gate array

Jørgensen, Nils B.; Birkmose, Dorthe; Trelborg, Karina Fogh; Wacker, L. J.; Winter, N.; Hilliard, Andrew J.; Bason, M. G.; Arlt, Jan J.

doi:10.1063/1.4959545

Cited by 15 publications

(8 citation statements)

References 24 publications

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“…Embedded devices with FPGA and microprocessor were successfully used to achieve similar tasks as we show here 5,6 . However they were developed in the framework of proprietary, platform-dependent software that limits the available tools for developing custom solutions and modifications.…”

Section: Introductionmentioning

confidence: 92%

Compact embedded device for lock-in measurements and experiment active control

Luda

Drechsler²,

Schmiegelow³

et al. 2019

Review of Scientific Instruments

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We present a multi-purpose toolkit for digital processing, acquisition and feedback control designed for physics labs. The kit provides in a compact device the functionalities of several instruments: function generator, oscilloscope, lock-in amplifier, proportional-integral-derivative filters, Ramp scan generator and a Lock-control. The design combines Field-Programmable-Gate-Array processing and microprocessor programing to get precision, ease of use and versatility. It can be remotely operated through the network with different levels of control: from simple out-of-the-shelve Web GUI to remote script control or in-device programmed operation. Three example applications are presented in this work on laser spectroscopy and laser locking experiments. The examples includes side-fringe locking, peak locking through lock-in demodulation, complete in-device Pound-Drever-Hall modulation and demodulation at 31.25 MHz and advanced acquisition examples like real-time data streaming for remote storage. Hardware / device FIG. 1: Layer structured design for the client-server architecture of the toolkit. The elements are grouped horizontally by site and type. In columns, the user possible strategies are shown. The first column follows the Red Pitaya STEMLab original design philosophy. The dashed line separates the client part (end-user device) and the server part (STEMLab device). The arrows show communication direction between elements.

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Section: Introductionmentioning

confidence: 92%

Compact embedded device for lock-in measurements and experiment active control

Luda

Drechsler²,

Schmiegelow³

et al. 2019

Review of Scientific Instruments

View full text Add to dashboard Cite

show abstract

“…For high-precision detection in the external referencing mode, the precision and stability of the reference signal generated by the ADPLL determines the accuracy of further calculation of outputs R and θ . Compared with an analog phase lock loop (PLL), an ADPLL has the advantages of the absence of thermal drift, better suppression of harmonics and interference, and flexible options for data processing [18,19]. Hence, an ADPLL was preferred in our design.…”

Section: The Digital Lock-in Amplifier Architecturementioning

confidence: 99%

A Wide-Band Digital Lock-In Amplifier and Its Application in Microfluidic Impedance Measurement

Huang

Geng

Zhang

et al. 2019

Sensors

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In this work, we report on the design of a wide-band digital lock-in amplifier (DLIA) of up to 65 MHz and its application for electrical impedance measurements in microfluidic devices. The DLIA is comprised of several dedicated technologies. First, it features a fully differential analog circuit, which includes a preamplifier with a low input noise of 4.4 nV/√Hz, a programmable-gain amplifier with a gain of 52 dB, and an anti-aliasing, fully differential low-pass filter with −76 dB stop-band attenuation. Second, the DLIA has an all-digital phase lock loop, which features a phase deviation of less than 0.02° throughout the frequency range. The phase lock loop utilizes an equally accurate period-frequency measurement, with a sub-ppm precision of frequency detection. Third, a modified clock link is implemented in the DLIA to improve the signal-to-noise ratio of the analog-to-digital converter affected by clock jitter of up to 20 dBc. A series of measurements were performed to characterize the DLIA, and the results showed an accurate performance. Additionally, impedance measurements of standard-size microparticles were performed by frequency sweep from 300 kHz to 30 MHz, using the DLIA in a microfluidic device. Different diameters of microparticle could be accurately distinguished according to the relative impedance at 2.5 MHz. The results confirm the promising applications of the DLIA in microfluidic electrical impedance measurements.

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“…The lock point of the target UV laser can be fine tuned by adjusting the lock point of the DAVLL in a huge real-time frequency tuning range up to GHz, which can cover the whole free spectral range (FSR) of conventional FP cavities. All frequency locking and shifting functions, including automatic lock-point finding and automatic two-way top-of-fringe transfer lock, are implemented by digital signal processing algorithms [32,33] based on field-programmable gate array (FPGA) technology. We build and test this approach in a trapped ion experiment.…”

Section: Introductionmentioning

confidence: 99%

High-performance frequency stabilization of ultraviolet diode lasers by using dichroic atomic vapor spectroscopy and transfer cavity*

Shen¹,

Ding²,

Zhang³

et al. 2020

Chinese Phys. B

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We develop a high-performance ultraviolet (UV) frequency stabilization technique implemented directly on UV diode lasers by combining the dichroic atomic vapor laser lock and the resonant transfer cavity lock. As an example, we demonstrate a stable locking with measured frequency standard deviations of approximately 200 kHz and 300 kHz for 399 nm and 370 nm diode lasers in 20 min. We achieve a long-term frequency drift of no more than 1 MHz for the target 370 nm laser within an hour, which is further verified with fluorescence count rates of a single trapped 171Yb+ ion. We also find strong linear correlations between lock points and environmental factors such as temperature and atmospheric pressure. Our approach provides a simple and stable solution at a relatively low cost, and features flexible control, high feedback bandwidth and minimal power consumption of the target UV laser.

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A simple laser locking system based on a field-programmable gate array

Cited by 15 publications

References 24 publications

Compact embedded device for lock-in measurements and experiment active control

Compact embedded device for lock-in measurements and experiment active control

A Wide-Band Digital Lock-In Amplifier and Its Application in Microfluidic Impedance Measurement

High-performance frequency stabilization of ultraviolet diode lasers by using dichroic atomic vapor spectroscopy and transfer cavity*

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