We all know that QSI laser diodes are widely used in daily life, so how should users use them after purchasing QSI laser diodes? What are the precautions for using QSI laser diode in Korea?

First, the basic use of QSI laser diode

1. Selection of driving circuit

Laser diode is a highly sensitive device to current and must be driven by a constant current source. It is recommended to use a dedicated laser diode driving circuit instead of a common power supply or a simple current limiting resistor.

Constant current drive: ensure stable output current and avoid current overshoot.

Soft start function: gradually increase the current to protect the laser chip.

Circuit with monitoring (PD port): it can realize power feedback control and ensure the stability of output optical power.

2. Optical system matching

QSI laser diode can be used in combination with collimating lens, focusing lens or optical fiber coupling system. According to the application scenarios (such as sensors, rangefinders, barcode scanner, etc.), it is necessary to choose appropriate optical devices to optimize the beam quality.

3. Heat dissipation management

Laser diode will generate heat when it works, and too high temperature will lead to wavelength drift and shortened life.

Low-power products: can dissipate heat through metal base or PCB.

Medium and high power products: need to be used with aluminum-based heat sinks or semiconductor refrigeration fins (TEC).

Long-term operation: It is recommended to equip with a temperature monitoring circuit to ensure that the laser chip is in a stable temperature range.

4. Correct packaging and installation

QSI laser diodes are available in different packaging forms, such as TO-CAN, C-Mount, optical fiber coupling, etc. Users should ensure that the devices are firmly fixed when installing, and avoid imposing mechanical stress on the pins and light-emitting windows.

Second, the use of QSI laser diode matters needing attention

1. Avoid electrostatic damage

Laser diode is very sensitive to static electricity, so you must wear an anti-static bracelet when operating, and the workbench should also be grounded. During transportation and storage, anti-static packaging should be used.

2. Current control is very important

Do not directly use batteries or ordinary power supply to drive.

Before using the laser, make sure that the parameters of the driving circuit are correct.

Instantaneous overcurrent will cause permanent damage to the device.

3. Environmental requirements

The working temperature is usually between -10℃ \~ +60℃, with slight differences among different models.

Avoid high humidity and dust environment and prevent the laser window from being polluted.

It should be stored in a dry and antistatic environment.

4. Optical safety protection

Laser beam has high concentration and energy density, so it must comply with laser safety regulations when using:

Equipped with laser protective glasses with suitable wavelength.

Avoid looking directly at the laser or reflecting the beam to the human eye.

In the laboratory or factory environment, there should be clear laser warning signs.

5. Long-term use and maintenance

Regularly check whether the cooling module and optical components are clean.

Whether the driving circuit runs stably and whether there is abnormal fluctuation.

Power feedback control is recommended for long-term application to keep the output stable.

Third, the advantages of QSI laser diode

High reliability: after strict aging and stability tests, it ensures stable operation in industrial environment.

Various packages: including TO package, optical fiber coupling module, array package and other forms to meet different customer needs.

Widely used: there are successful application cases in displacement sensor, laser ranging, bar code recognition, optical communication, medical equipment and other fields.

QSI laser diode pursues stability and high performance in design and manufacturing process. Proper use and standardized operation can significantly prolong its service life and ensure stable output performance. In the application process, users should pay special attention to the driving circuit, current control, heat dissipation management and anti-static measures, and at the same time abide by the laser safety specifications.