Digital butterfly laser diode controller

PRODUCTS > PHOTONICS > LASER DRIVERS > DIGITAL BUTTERFLY LASER DIODE CONTROLLER
Digital butterfly laser controller
Digital butterfly laser controller CTL200 mechanical drawing CTL200 Graphical User Interface CTL200 current stability CTL200 current linearity CTL200 modulation CTL200 temperature coefficient

Koheron CTL200 is the digital version of the popular CTL100 analog laser controller. It drives up to 200 / 400 / 600 mA laser current with a current noise density of only 230 / 450 / 670 pA / √Hz. The CTL200 fits in a 75 mm x 75 mm square, uses a single 5.9 V supply, and can operate between 0 and 50°C. The CTL200 is conduction-cooled. It comes with an aluminum base plate and a zero insertion force socket for easy mounting.

1245 €

CTL200-1-B-200

Quantity Price
1+ 1245 €
4+ 1045 €
20+ 890 €


Resources

Includes

  • CTL200 digital laser controller
  • 5.9 V 3 A power supply

Specifications

CTL200 laser controller is available for type 1 lasers (CTL200-1-) and type 2 lasers (CTL200-2).

Option B-200 (200 mA)
B-400 (400 mA)
B-600 (600 mA)
Compatible lasers Floating diodes / anode-grounded (isolation pad available upon request) Floating diodes / anode-grounded (isolation pad available upon request) Floating diodes / anode-grounded (isolation pad available upon request)
Current driver
Laser current 5 - 225 mA 10 - 450 mA 15 - 675 mA
Laser current resolution 5 µA 10 µA 15 µA
Compliance voltage at max. current 3.0 V 3.0 V 2.9 V
RMS noise (10 Hz - 1 MHz) 220 nArms 430 nArms 650 nArms
Current noise density (1 kHz) 230 pA / Hz1/2 450 pA / Hz1/2 670 pA / Hz1/2
1 / f corner noise 100 Hz 100 Hz 100 Hz
Temperature coefficient 35 ppm / °C 35 ppm / °C 35 ppm / °C
Slow start (90 % setpoint) 5000 ms 5000 ms 5000 ms
Modulation gains 250 µA / V, 2.5 mA / V, 25 mA / V 500 µA / V, 5 mA / V, 50 mA / V 750 µA / V, 7.5 mA / V, 75 mA / V
3 dB modulation bandwidth 10 MHz 10 MHz 10 MHz
AC modulation cutoff frequency 80 kHz 80 kHz 80 kHz
TEC controller
Maximum current 1.5 A 1.5 A 1.5 A
Compliance voltage +/- 3 V +/- 3 V +/- 3 V
Temperature stability 0.002 °C / °C 0.002 °C / °C 0.002 °C / °C
Laser power monitor
Photodiode current 0 - 2.5 mA 0 - 2.5 mA 0 - 2.5 mA
Other
Dimensions 78.5 mm x 84.7 mm x 20 mm 78.5 mm x 84.7 mm x 20 mm 78.5 mm x 84.7 mm x 20 mm
Weight 104 g 104 g 104 g
Supply voltage 5.7 V to 6.5 V 5.7 V to 6.5 V 5.7 V to 6.5 V
Operating temperature 0 °C - 50 °C 0 °C - 50 °C 0 °C - 50 °C

More Laser Drivers


Current driver

Current stability

Current stability is depicted in the following figure showing a 12-hour long evolution of current at 25 °C ambient temperature. A controller with 200 mA laser current (B-200) set at 200 mA was used for this measurement.

CTL200 laser diode controller current linearity

Current is stable within +/- 10 ppm.

Temperature coefficient

The figure below shows the current variation of the controller for the 600 mA laser current version (B-600) operated at 550 mA for different ambient temperatures between 0 and 55 °C. The current is measured using a high precision 5 Ohm resistor and a 7.5-digit digital voltmeter. Temperature coefficient is below 30 ppm/°C.

CTL200 laser diode controller temperature coefficient

Current linearity

CTL200 controllers are calibrated at 21 °C by measuring the voltage across a high-precision 5 Ohm resistor with a 7.5-digit digital voltmeter. Here is a typical result for the calibration for the 400 mA laser current version (B-400):

CTL200 laser diode controller current linearity

Relative residuals from a linear fit show that linearity is better than 0.1% for currents above 50 mA.

Modulation

The CTL200 laser diode controller features a DC modulation which controls the current setpoint input with 10 MHz bandwidth. An AC input provides direct laser diode RF modulation for frequencies above 100 kHz.

CTL200 laser diode controller modulation



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