Digital Diode Laser Controller (dDLC)
The MOGLabs Digital Diode Laser Controller is our next-generation controller for precision tunable lasers. It combines the ergonomic ease-of-use of our classic analogue DLC, with the flexibility and performance of a fully digital system.
It offers a combination of impressive performance and ease-of-use, using the front panel with high resolution display, or our comprehensive Windows app, or your own code using the simple text-based command language that MOGLabs is famous for.
The dDLC is designed for the ultimate applications in quantum computing, quantum sensing, time and frequency standards, gas sensing, and spectroscopy.
Features
- - Intuitive fully-feature controls for standalone operation
- - FFT spectrum analyzer
- - Oscilloscope functionality built-in
- - Ultra-low noise current source
- - Temperature controller
- - Demodulator (lock-in amplifier)
- - Feedback servos: locking is included
- - Auto-lock and auto-relock (in development)
- - Modulator driver (dual channel DDS)
- - Sweep ramp generator
- - TCP/IP, USB2
- - LabVIEW, MATLAB and python drivers
Specifications
Current
| Output current | 0 to 800mA ±5uA setpoint (display ±10uA), control ±8nA |
|---|---|
| Noise* | 240pA/√Hz @ 1 kHz, 250nA (rms) 1 Hz – 1 MHz |
| Stability and accuracy | ± 0.2ppm/°C and 0.1% from setpoint |
| Compliance voltage | 8 V at 400mA, 4 V at 800mA |
| Current modulation | 1. ±25mA Direct analogue, Sweep 2. ±1mA Direct analogue, Dither, Control DAC 1, Control DAC 2 3. ±250uA Dither, Control DAC 2 DAC1, DAC2: 16 bits at 3.125MHz |
| Current modulation bandwidth | Direct analogue mode: 1.2 MHz (–3dB) DAC control (fast): 3.2 MHz (28-bit depth) |
Temperature
| Range | 7.5 – 49.5°C ±1mK resolution |
|---|---|
| Stability | Better than ±1mK/°C |
| TEC power | ±2A, ±12V (24W) |
| Sensor | NTC 10kΩ |
| Control | PID with variable sample rate, bandwidth 50 Hz |
| Protection | PCB over temp, TEC over current, open/short circuit |
Piezo
| Piezo output | Two independent channels 0 – 150V, ±10mA (charge and discharge) |
|---|---|
| Piezo Sweep/Control DAC | Individual Sweep and Control DACs, 16 bits unipolar |
| Resolution | Sweep: 2.5mV resolution at maximum range Control: variable gain from 240µV to 16µV per LSB |
| Noise | 80nV/√Hz |
| Sweep | Internal 0.1 Hz to 62.5 Hz; auxiliary inputs ChA, ChB; programmable |
| Monitoring | Voltage and current measurement for each channel |
| Protection | Leakage, PCB over temperature |
Frequency stabilization
| Dither for AC locking | 0 to 2.5 MHz ±0.058 Hz (default 250kHz) Dither to diode current (±250µA or ±1mA) or external (±150mA or ±4 V) |
|---|---|
| Bandwidth | 3.2 MHz (DAC control) |
| Phase | 0 − 360°, 0.022° resolution |
| Error signal | 32-bits signed, sampling at 6.25 MHz |
| Post demodulator filter | 5 stage IIR and user adjustable response including bypass option |
| Servo Controls | Slow (piezo) and Fast (current) servo controllers with individual offset |
| Gain Controls | ±18dB master plus ±18dB on slow, fast channels |
| Slow Controller Inputs | 1. Slow Error Signal (after offset and master gain) 2. Auxiliary A 3. Auxiliary B 4. Photodetector DC Input 5. Fast controller Output |
| Slow Controller Action | PI with 20 dB/dec gain with user-adjustable response |
| Fast Controller Input Selection | 1. Fast Error Signal (after offset and master gain) 2. DC Block Output (AC coupled error signal) |
| Fast Controller Action | PI with 20 dB/dec gain with user-adjustable response |
Signal input/output
| Signal input/output | 8 BNC connectors
- Mod out 1 MOGLabs DVI-D DL socket Option: Toptica DL Pro |
|---|---|
| Analogue inputs (4) | Signal range ±4.096 V (protected to ± 15 V) Photodetector AC: 12.5 MHz > 150dB dynamic range DC: 1 MHz > 110dB dynamic range Auxiliary A and B: DC 1 MHz > 110dB dynamic range Direct: analogue input direct to diode current modulation |
| Analogue outputs (2) | Monitor A and B, 16 user-selectable signals; output range ±4 V. Sampling up to 3.25 MHz @ 16 bits / BW 1 MHz Dither Voltage/Current Driver (user selectable): output ±4.096 V ±150mA |
| Digital inputs | TTL compatible, 0 – 6.5 V tolerant and protected, active low <0.8 V: a) 3.5mm stereo jack (external Fast/Slow Lock inputs) b) 3.5mm stereo jack (External Laser1/Laser2 interlocks) |
| Digital outputs | TTL compatible, 0 – 6.5 V tolerant and protected, active high >2.4 V: a) Trigger (sweep mid-point) b) 3.5mm stereo jack (Fast/Slow Lock outputs) |
Front panel user interface
| Operator controls | 1 key switch STANDBY/RUN 6 dedicated rotary encoders: diode current, input offset, frequency, span, slow gain, fast gain, each with press-function 3 dedicated pushbuttons: diode on/off, slow lock, fast lock 1 menu adjust encoder 2 menu step pushbuttons |
|---|---|
| LED indicators | Four 3-colour LEDs: standby/run, laser diode, slow lock, fast lock |
| Digital outputs | 127mm, 800x480 pixels, full colour |
Connectivity
| Communications | TCP/IP ethernet (10/100); USB 2.0 Type B |
|---|---|
| Laser | Standard: MOGLabs DVI-D DL socket; Option: Toptica DLPro |
| Power out | Photodetector supply (M8-3 Thorlabs-compatible), ±15 V |
Power and dimensions
IEC input 90 – 264 Vac @ 47 – 63 Hz Power 28 W (laser off) Dimensions 19” 2U, 88x422x270 mm (H x W x D),
optional rack-mount ears, 3.5kg
Operating Temperature 10 - 35°C
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Digital Diode Laser Controller (dDLC) | MOGLabs
