Laser diodes are one of the most sensitive to static electricity among the devices currently manufactured. Generally, laser diodes are equipped with instructions for use. If you use them according to the instructions, laser diodes have an extremely long service life. This is because the laser diodes are damaged. Most of the reason lies in incorrect operation or use exceeding the laser's rated value. Therefore, appropriate electrostatic protection measures should be taken when handling laser diodes at any time. Because laser diodes are extremely sensitive to static electricity, they will not be returned after unpacking. If the laser diode is kept in the original package, it can be returned or exchanged. Therefore, you must have the knowledge of the correct use of the laser diode before you buy it to prevent unnecessary losses! Handling and storage measures 1. Electrostatic bracelet: when handling the laser diode A grounded anti-static wrist strap should be used. The anti-static wristband can safely remove static electricity from people who are in contact with laser diodes, amplified photodetectors and other electrostatic sensitive devices. The grounding wire contains a resistance of 1 megohm to ensure the safety of users. If the wrist strap is used with the static control platform pad, the anti-static effect will be better. 2. Anti-static table mat: It should be operated on a grounded anti-static table mat. The electrostatic relaxation time is 50 milliseconds, and the anti-static pad can protect sensitive optoelectronic devices from electrostatic discharge damage. These heavy duty pads have an electrostatic relaxation time of 50 milliseconds, ensuring protection under extreme conditions. The electrostatic protection wrist strap can generally be connected to the platform pad. When touching sensitive electronic devices, it is very necessary to ground the operator through the wrist strap. 3. Laser diode storage: When the laser diode is not applicable, short the wire of the laser diode to prevent ESD damage. Picture Operation and safety measures 1 Use a suitable driver: The laser diode requires precise control of the operating current and voltage to prevent the laser diode from overloading. In addition, the laser driver should provide protection against power transients. Based on the above considerations, users should choose a laser driver suitable for their application. A voltage source with a current-limiting resistor cannot be used, and it cannot provide sufficient measures to protect the laser. 2. Reflection: The plane in front of the laser diode in the optical system will cause a certain amount of laser energy to be reflected back to the monitoring photodiode in the laser, thereby falsely giving a higher photodiode current. If the optical components in the system move and the reflected light energy is no longer incident on the monitoring photodiode, the Hengdian power feedback circuit in the laser will sense the decrease in the photodiode current and increase the laser drive current to compensate the photodiode. The current, in this way, may overdrive the laser. Back reflections can also cause other failures and damages to the laser diode. In order to prevent these damages, please ensure that the surfaces of all devices have an inclination angle of 5-10°. If necessary, an optical isolator can be used to attenuate the direct feedback of the laser. 3. Voltage and current overload: When using a laser diode, you should be careful not to exceed the corresponding maximum voltage and drive current in the specification table, even in a short time, it cannot exceed its specified value. In addition, even a 3-volt response voltage can damage the laser diode. 4. ON/OFF and power coupling transient: Since laser diodes have a very open response time, they are easily damaged in transients of less than 1 microsecond. High-current devices, such as soldering irons, vacuum pumps, and fluorescent lamps, can cause severe transient transients. Therefore, shock protection sockets should be used. 5. Power meter: When setting and calibrating the laser diode through the driver, a NIST traceable power meter can be used to accurately measure the laser output. Measuring the output of the laser directly before adding it to the optical system is usually the safest measurement method. If this measurement is not possible, make sure to consider all optical losses (transmission, aperture stop, etc.) when determining the total output of the laser. Picture 6. Radiator: The life of the laser diode is inversely proportional to the operating temperature. The laser diode should be installed in a suitable heat sink, so that the excessive heat on the laser package can be transferred out in time. 7. ESD sensitive devices: At present, the operation of laser diodes is extremely vulnerable to ESD damage. This situation is particularly serious when long wires are used between the laser diode and its driver. Avoid exposing the laser or its installation device to the ESD environment at any time. To sum up, as long as you master the correct rating method and use method, the laser diode can be used to the greatest extent!
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