Industrial laser diode controller
Koheron CTL300E is a rugged laser diode controller with the following features:
- High-efficiency current driver up to 1600 mA.
- ±4.5 V / 2 A TEC controller.
- Wide input supply voltage range: 6 V to 33 V.
- -40°C to 85 °C operating temperature range.
- On-board monitoring and diagnostics.
- Modulation input port with 5 MHz bandwidth.
- Fast switching between two independent current setpoints via digital input.
- Mates with the TB300 breakout board sold separately.
CTL300E laser controller is available for type 1 lasers (CTL300E-1-) and type 2 lasers (CTL300E-2-).
|Laser current||10 - 425 mA||15 - 850 mA||15 - 1275 mA||15 - 1700 mA|
|Laser current resolution||7 µA||14 µA||21 µA||28 µA|
|Compliance voltage at max. current||3.8 V||3.8 V||3.7 V||3.7 V|
|RMS noise (10 Hz - 1 MHz)||0.85 µArms||1.7 µArms||2.5 µArms||3.5 µArms|
|Current noise density (10 kHz)||0.8 nA/√Hz||1.7 nA/√Hz||2.7 nA/√Hz||3.4 nA/√Hz|
|Temperature coefficient||15 ppm/°C||15 ppm/°C||15 ppm/°C||25 ppm/°C|
|Modulation gain||40 mA/V||80 mA/V||120 mA/V||160 mA/V|
|3 dB modulation bandwidth||5 MHz||5 MHz||5 MHz||4 MHz|
|Maximum current||2 A||2 A||2 A||2 A|
|Compliance voltage||±4.5 V||±4.5 V||±4.5 V||±4.5 V|
|Temperature stability||0.002 °C/°C||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||0 - 2.5 mA|
|Outside Dimensions||131 mm x 41.5 mm x 27.7 mm||131 mm x 41.5 mm x 27.7 mm||131 mm x 41.5 mm x 27.7 mm||131 mm x 41.5 mm x 27.7 mm|
|Weight||95 g||95 g||95 g||95 g|
|Supply voltage||6 V to 33 V||6 V to 33 V||6 V to 33 V||6 V to 33 V|
|Operating temperature||-40 - 85 °C||-40 - 85 °C||-40 - 85 °C||-40 - 85 °C|
|Compatible lasers||Floating diodes||Floating diodes||Floating diodes||Floating diodes|
More Laser drivers
The CTL300E offers fast switching between two independent current setpoints. The two setpoints are defined using the UART interface and the BSEL logic input is used to select the desired setpoint channel. Transition time is about 400 ns.
Example of switching between 100 mA and 600 mA using a Thorlabs BL976-SAG300 pump laser diode with 400 mV laser driver voltage drop (yellow: BSEL signal 3.3 V 100 kHz, green: laser diode output power):
Modulation frequency response
The figure below shows the modulation frequency response of the CTL300E controller measured with 1 Vpp input modulation voltage amplitude and 400 mV laser driver voltage drop.
The figure below shows the current stability of the CTL300-1-1200 controller operated at 1200 mA.
The figure below shows the allan deviation of the CTL300E controller operating at rated current.
Current noise density
The figure below shows the current noise density of the CTL300E controller operating at rated current with 400 mV laser driver voltage drop.
The figure below shows the variation of the output current against the ambient temperature of the CTL300E controller operating at rated current.
The CTL300E controller's laser driver is designed to offer a high energy conversion efficiency together with a low current noise. The CTL300E controller maintains high efficiency over a wide range of laser currents and input voltages.
The figure belows shows the overall load efficiency (= laser electrical power / input power) of a CTL300E-1-1200 controller with 200 mV laser driver voltage drop.