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Low noise butterfly laser diode controller

PRODUCTS > PHOTONICS > LASER DRIVERS > LOW NOISE BUTTERFLY LASER DIODE CONTROLLER
Low noise butterfly laser controller
Low noise butterfly laser controller CTL101 current noise CTL101 settling time CTL101 one hour stability CTL101 modulation transfer function

Koheron CTL101 is a low noise current driver with modulation combined with a temperature controller. It is designed to drive narrow-linewidth laser diodes in butterfly package. It is compatible with floating diodes, which means that neither the anode nor the cathode should be connected to the case. The CTL101 fits in a 75 mm x 75 mm square, uses a single 5 V supply, and can operate between 0 and 50°C. The CTL101 is conduction-cooled. It comes with an aluminum base plate and a zero insertion force socket for easy mounting.

990 €

CTL101-1-B-200

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Specifications

CTL101 laser controller is available for type 1 lasers (CTL101-1-) and type 2 lasers (CTL101-2-).

B-200 (200 mA) B-400 (400 mA) B-600 (600 mA) B-800 (800 mA)
Current driver
Laser current 0 - 220 mA 0 - 440 mA 0 - 660 mA 0 - 880 mA
Compliance voltage (5V supply) 2.2 V 2.2 V 2.2 V 2.2 V
Compliance voltage (6V supply) 3.2 V 3.2 V 3.2 V 3.2 V
RMS noise (10 Hz - 1 MHz) L/M gain 200 nArms 390 nArms 600 nArms 810 nArms
RMS noise (10 Hz - 1 MHz) H gain 280 nArms 560 nArms 860 nArms 1160 nArms
Current noise density (1 kHz) 220 pA/√Hz 420 pA/√Hz 620 pA/√Hz 820 pA/√Hz
Current limit (H / L) 250 / 150 mA 500 / 300 mA 750 / 450 mA 1000 / 600 mA
Modulation gains 1 mA/V, 10 mA/V, 100 mA/V 2 mA/V, 20 mA/V, 200 mA/V 3 mA/V, 30 mA/V, 300 mA/V 4 mA/V, 40 mA/V, 400 mA/V
3 dB modulation bandwidth 12 MHz 12 MHz 12 MHz 12 MHz
Temperature coefficient 15 ppm/°C 15 ppm/°C 15 ppm/°C 15 ppm/°C
Slow start (90 % setpoint) 250 ms 250 ms 250 ms 250 ms
AC modulation cutoff frequency 1.5 MHz 1.5 MHz 1.5 MHz 1.5 MHz
TEC controller
Maximum current 1.2 A 1.2 A 1.2 A 1.2 A
Temperature range (10 K thermistor) 10 °C to 35 °C 10 °C to 35 °C 10 °C to 35 °C 10 °C to 35 °C
Compliance voltage ±3 V ±3 V ±3 V ±3 V
Temperature stability 0.0015 °C/°C 0.0015 °C/°C 0.0015 °C/°C 0.0015 °C/°C
Laser power monitor
Photodiode current 0 - 1 mA 0 - 1 mA 0 - 1 mA 0 - 1 mA
Gain 3.9 V/mA 3.9 V/mA 3.9 V/mA 3.9 V/mA
Frequency range DC - 20 MHz DC - 20 MHz DC - 20 MHz DC - 20 MHz
Other
Outside Dimensions 75 mm x 85 mm x 27 mm 75 mm x 85 mm x 27 mm 75 mm x 85 mm x 27 mm 75 mm x 85 mm x 27 mm
Weight 103 g 103 g 103 g 103 g
Supply voltage 4.9 V to 6.5 V 4.9 V to 6.5 V 4.9 V to 6.5 V 4.9 V to 6.5 V
Operating temperature 0 °C - 60 °C 0 °C - 60 °C 0 °C - 55 °C 0 °C - 50 °C

More Laser Drivers

Current driver

The figure below shows the relative current change of the CTL101 laser controller set at 800 mA current (CTL101-2-B-800) during its first 100 hours of operation:

CTL101 early life drift

The current stability of the controller after 100 hours is shown below:

CTL101 one hour stability

After a subsequent power-on, the CTL101 controller takes only one minute to settle the laser current within 10 ppm of the setpoint value:

CTL101 settling time

Current modulation

The CTL101 controller has two current modulation inputs available on SMA connectors. The DC modulation input allows to modulate the current setpoint between DC and 10 MHz. A jumper allows to choose between 3 modulation gains (2 mA/V, 20 mA/V and 200 mA/V for the 400 mA version).

CTL101 DC modulation transfer function

The AC modulation input can be used to modulate the laser above 1 MHz with a modulation gain of 20 mA/V:

CTL101 AC modulation transfer function

Current noise

The figure below shows the current noise of the CTL101 controller at operating currents of 200, 400, 600 and 800 mA:

CTL101 current noise

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 a precision trimming potentiometer.

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CTL101
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