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CTL100 Low noise butterfly laser diode controller
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Specifications
| CTL100-A-400 | CTL100-B-400 | |
|---|---|---|
| Current driver | ||
| Laser current | 5 mA to 400 mA | 5 mA to 400 mA |
| Compliance voltage | 2.3 V | 2.3 V |
| RMS noise10 Hz to 1 MHz, M modulation gain | 386 nArms | 510 nArms |
| Current noise density1 kHz | 450 pA/√Hz | 450 pA/√Hz |
| 1/f corner noise | 20 Hz | 20 Hz |
| Temperature coefficient | 15 ppm/°C | 15 ppm/°C |
| Current limit | 420 mA | 420 mA |
| Slow start90 % setpoint | 1000 ms | 1000 ms |
| Modulation gainL setting | 2 mA/V | 2 mA/V |
| Modulation gainM setting | 20 mA/V | 20 mA/V |
| Modulation gainH setting | 200 mA/V | 200 mA/V |
| 3 dB modulation bandwidth | 150 kHz | 11 MHz |
| AC modulation cutoff frequency | 70 kHz | 1.5 MHz |
| TEC controller | ||
| Maximum current | 1.2 A | 1.2 A |
| Temperature range10 K thermistor | 12 °C to 25 °C | 12 °C to 25 °C |
| Compliance voltage | 3.4 V when cooling, 0.7 V when heating | 3.4 V when cooling, 0.7 V when heating |
| Temperature stability | 0.0015 °C/°C | 0.0015 °C/°C |
| Laser power monitor | ||
| Photodiode current | 0 mA to 1 mA | 0 mA to 1 mA |
| Gain | 3.9 V/mA | 3.9 V/mA |
| Bandwidth | 50 MHz | 50 MHz |
| Other | ||
| Outside dimensions | 75 mm x 85 mm x 27 mm | 75 mm x 85 mm x 27 mm |
| Weight | 103 g | 103 g |
| Supply voltage | 4.9 V to 5.5 V | 4.9 V to 5.5 V |
| Operating temperature | 0 °C to 50 °C | 0 °C to 50 °C |
| Compatible lasers | Type 2, Floating diodes / anode-grounded | Type 2, Floating diodes / anode-grounded |
More laser drivers
Current driver
Current stability
Current stability is depicted in the following figure showing a 24-hour long evolution of current, set to 350 mA at 25 °C ambient temperature. After a 2 h warm-up time, current is stable within ±5 ppm.
The figure below show the evolution of the CTL100 current, set at 350 mA, measured with a Keysight 34470A digital multimeter across a 5 Ω resistor.
The figure below shows the current variation for different ambient temperatures between 5 and 55 °C. Temperature coefficient is below 15 ppm/°C.
Current modulation
DC current modulation input
A modulation input from DC to 100 kHz is available (10 MHz for the CTL100-A-400).
A jumper selects one of 3 modulation gains (2 mA/V, 20 mA/V or 200 mA/V).
AC modulation input
An AC modulation input using a bias-tee is available for modulation frequencies above 100 kHz for the 100 kHz bandwidth version (A-400) and above 3 MHz for the 10 MHz bandwidth version (B-400). The actual modulation gain depends on the value of the resistor integrated in the laser.
Current noise
The power spectral density of the 100 kHz bandwidth version (A-400) current noise was characterized for the 3 modulation gains.
Current noise integrated between 10 Hz and 1 MHz is 385 nA, 386 nA and 406 nA RMS at the low, medium and high gain settings respectively.
Temperature controller
The temperature controller consists of a precision Wheatstone bridge, an analog PID controller and a linear current driving stage. PID gains are fixed and have been adjusted for a typical butterfly laser diode. Temperature setpoint is adjusted with an ultra high precision trimming potentiometer.
