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Narrow Pulse Butterfly Laser Driver
Classification:
The maximum pulse peak current that the drive can provide is ≈ 2A, which may damage the drive. So don't try a peak current higher than 2A. The maximum pulse peak current that the laser can withstand is different, and the proportional relationship between the pulse width and the repetition frequency is relatively large. Usually, when the repetition frequency is low and the pulse width is narrow, the peak current that can be tolerated is greater.
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The maximum pulse peak current that the drive can provide is ≈ 2A, which may damage the drive. So don't try a peak current higher than 2A. The maximum pulse peak current that the laser can withstand is different, and the proportional relationship between the pulse width and the repetition frequency is relatively large. Usually, when the repetition frequency is low and the pulse width is narrow, the peak current that can be tolerated is greater.
Main Features Features
The laser is plug and play.
Compatible with 14PIN and 10PIN various wavelength butterfly laser
TTL, LVTTL rising edge trigger.
9V ~ 15V single power supply.
Laser current limit, temperature, power supply reverse connection protection.
Pulse width monitoring output.
Integrated temperature control.
0.5ns ~ 10ns pulse width adjustable range, repetition frequency 20Hz ~ 50MHz.
0.3A ~ 2A peak drive current.
Built-in 1MHz trigger.
Power consumption at full load <2W
62mm × 55mm small volume
Application field Applications
MOPA seed light source
Lidar
TOF imaging
laser ranging
OTDR
Testing and Screening of Pulsed Laser
First Use Guide
Due to the high frequency impedance of the laser socket, a bias voltage far exceeding the rated operating voltage of the laser is required to drive the loop to the target peak current. Therefore, please refer to the following instructions and steps before starting to use to ensure that the laser and drive work properly without accidental damage.
TEC default locking temperature: 25°C;TEC maximum operating voltage: 2V;TEC maximum operating current: 1A.
Operation steps:1. Do not install the laser for the first time, short-circuit "JP1" with a jumper cap, or connect "EXT IN" through an external signal source, and input a low-frequency TTL or LVTTL signal (10kHz ~ 1MHz) to trigger the driver.
2. Connect the "PW-OUT" to the oscilloscope, connect the power supply to the "DC IN", and observe the oscilloscope pulse waveform. Adjust "Rset-1" to determine whether the pulse width is within the range of 0.5ns ~ 10ns. If normal, adjust the pulse width to slightly less than the target value.
3. Disconnect the power supply, disconnect the "JP1" jumper, and disconnect the "EXT IN" input. After ensuring that no trigger signal is input to the driver, install, fix and power the laser. Wait for the temperature of the laser to stabilize to 25°C, "LED-4" will light up. Connect the voltmeter to "Vb-OUT" and "GND", adjust "Rset-2" and observe the change of voltmeter reading. The adjustment range is 4V ~ 30VDC. The Vb voltage is determined in combination with the target pulse width and the target peak optical power according to the corresponding relationship between the pulse width and the PIV given in the following figure. (You can also start directly from the lowest voltage).
4. Disconnect the power supply after adjusting Vb to the target value at a value lower than 30% or directly taking the lowest voltage. Connect the "JP-1" jumper cap or connect an external signal source to the "EXT IN", the initial value of the trigger signal is as low as possible, such as 100kHz.
5. Turn on the power supply, the system enters the normal working state after the "LED-4" is lit, and the pulse light signal can be observed through the optical power meter and the photoelectric detector. The repetition frequency, pulse width and bias voltage are further adjusted as needed until the output power and pulse width reach the target, and the operation flow ends.
Description of maximum working range and working principle of protection circuit:
The maximum pulse peak current that the drive can provide is ≈ 2A, which may damage the drive. So don't try a peak current higher than 2A. The maximum pulse peak current that the laser can withstand is different, and the proportional relationship between the pulse width and the repetition frequency is relatively large. Usually, when the repetition frequency is low and the pulse width is narrow, the peak current that can be tolerated is greater.
In order to avoid the laser damage caused by the fault of the laser cathode short circuit or anode overvoltage, the laser CW current limit point 100mA is set. While protecting the laser, it also limits the pulse current. Maximum pulse current = repetition period ÷ pulse width × 100mA. Laser temperature protection principle: Only when the internal temperature of the laser is stable at 25°C, "Vb" will have voltage after the "LED-4" is lit, otherwise the bias circuit will not work and the output will be zero. The bias circuit stops supplying current to the laser immediately after the laser has lost temperature. The driver also provides input reverse connection protection and surge protection, the principles of which are not detailed here.
For higher performance, the laser welding version can be selected.
FAQ Description:
Due to the different response of different lasers to the pulse current, waveform problems may occur, such as slow rising edge and high level oscillation. In addition to the stray inductance of the laser itself and the series effect of the package capacitance, light reflection may cause the above two situations. The peak power approaches or exceeds the upper limit of the nominal CW power, both of which may occur under long pulses. There is usually a visible critical point, showing that the optical power no longer rises with the rise of the current, or even falls. Take the CM96Z series laser as an example:
It can be seen that the narrow pulse is normal. For long pulses, the waveform oscillates after the peak current is greater than the nominal CW rated current, the drive current doubles, and the output power increases by only 30%. This oscillation mainly comes from the lens, the reflection coefficient of the fiber coupling and the FBG grating reflection. Different series of lasers perform very differently. In this case, the corresponding relationship between pulse width and current can be adjusted to find an acceptable balance point.
The correlation between the three parameters of pulse width, repetition frequency and peak current is difficult to balance perfectly due to the difference of lasers. The default typical circuit is set to 10ns pulse width, and the peak current in the range of 50Hz ~ 1MHz repetition frequency does not follow the repetition frequency change and remains stable. The duty cycle of 1% and below is recommended in the range of 0.5ns ~ 10ns pulse width. The smaller the duty cycle, the smaller the effect of repetition frequency.
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Model
Main featuresApplication areas
The laser is plug and play.
Compatible with 14PIN and 10PIN various wavelength butterfly laser
TTL, LVTTL rising edge trigger.
9V ~ 15V single power supply.
Laser current limit, temperature, power supply reverse connection protection.
Pulse width monitoring output.
Integrated temperature control.
0.5ns ~ 10ns pulse width adjustable range, repetition frequency 20Hz ~ 50MHz.
0.3A ~ 2A peak drive current.
Built-in 1MHz trigger.
Power consumption at full load <2W
62mm × 55mm small volume
MOPA seed light source
Lidar
TOF imaging
laser ranging
OTDR
Testing and Screening of Pulsed Laser
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Contact Information
Contact Phone
E-mail: sales@fiberlink.com.cn
Address: Building 1, No. 12 Miaoshan East Road, Jiangxia District, Wuhan, Hubei Province, 430073 P.R China