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Field-programmable gate array based arbitrary signal generator and oscilloscope for use in slow light and storage of light experiments
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10.1063/1.4811147
/content/aip/journal/rsi/84/6/10.1063/1.4811147
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/6/10.1063/1.4811147
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) The simplified FPGA program algorithm and (b) the block diagram showing how the data between the PC and the FPGA board are exchanged. The explanation of all FPGA signals and registers are provided in the supplementary material. Note that the blocks (I), (II), and (III) in (a) are all run in parallel by the FPGA chip.

Image of FIG. 2.
FIG. 2.

The simplified scheme of the analog electronic circuit attached to the FPGA board. The circuit contains the power supply unit, the voltage regulators, the ADC chips, and the amplifying and offsetting stages for both input and output voltages.

Image of FIG. 3.
FIG. 3.

The device photograph: (a) Digilent Nexys-2 board, (b) Spartan 3E-1200 FPGA chip, (c) printed circuit board, (d) two DAC chips, (e) two ADC chips, (f) the copper plate for grounding the board, (g) voltage regulators from 15 V AC down to +3.3 V, ±5 V, and ±12 V DC, (h) BNC connectors for the two analog voltage inputs, (i) BNC connectors for the two analog voltage outputs, and (j) 15 V AC power supply of the board.

Image of FIG. 4.
FIG. 4.

Experimental setup and the atomic transition used in the experiment. ECDL: external cavity diode laser; OI: optical isolator; DDAVLL: Doppler-free dichroic atomic vapor laser lock; BS: beam splitter; FC: fiber coupler; SMF: single-mode fiber; FCL: fiber collimator; AOM: acousto-optic modulator; P: polarizer; PBS: polarizing beamsplitter; PD: large area photodetector. Output voltage signals from FPGA device control the AOM and the Pockels cell, while signals from the two photodetectors are input signals to the FPGA device.

Image of FIG. 5.
FIG. 5.

Two output DAC signals from the FPGA device that control the AOM and the Pockels cell in the slow light experiment: (a) single Gaussian σ light pulse of duration with AOM turned on all the time, and (b) preparation Π-shaped σ light pulse of duration followed by the AOM turned off during time and Gaussian σ light pulse of duration .

Image of FIG. 6.
FIG. 6.

Screenshots of real-time monitoring of the two photodetectors' signals that measure slow (i) and fast (ii) σ light pulses: (a) no preparation pulse with the AOM turned on all the time, (b) preparation Π-shaped σ light pulse followed by the AOM turned off and Gaussian-shaped σ pulse. Parameters’ values: = 2 ms, = 200 μs, = 500 μs, = 100 μs, η = 0.15, and = 1.3 mW. Note the different voltage scalings for curves (i) in (a) and (b).

Image of FIG. 7.
FIG. 7.

Two output DAC signals from the FPGA device that control the AOM and the Pockels cell in the storage of light experiment: (a) single Gaussian-shaped σ light pulse of duration + with AOM turned off for the storage time + , and (b) preparation Π-shaped σ light pulse of duration followed by the AOM turned off during the time prior to the storage of light signals’ conditioning.

Image of FIG. 8.
FIG. 8.

Screenshots of real-time monitoring of the two photodetectors' signals that measure slow (i) and fast (ii) σ light pulses: (a) no preparation pulse with the AOM turned on all the time, (b) preparation Π-shaped σ light pulse followed by the AOM turned off and Gaussian σ pulse. Parameters’ values: = 4 ms, = 400 μs, = 160 μs, = 50 μs, = 50 μs, = 20 μs, η = 0.30, and = 1.7 mW.

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/content/aip/journal/rsi/84/6/10.1063/1.4811147
2013-06-19
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Field-programmable gate array based arbitrary signal generator and oscilloscope for use in slow light and storage of light experiments
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/6/10.1063/1.4811147
10.1063/1.4811147
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