We all know that laser diodes are widely used in daily life, so do you know what driving circuits are commonly used to drive laser diodes in daily life? Many friends will also ask whether QSI laser diodes can be made into modules.

In modern optoelectronic devices, laser diode has become the core component in many application fields. From optical communication, laser ranging, industrial processing to medical testing, and then to consumer electronic products, laser diodes are almost everywhere. However, the working characteristics of the laser diode itself determine that it must rely on the driving circuit to achieve stable, safe and efficient operation. So, what are the common driving circuits of laser diodes? Can Korean QSI laser diode be integrated into a standardized laser module? This article will give you a systematic answer.

1. Why does the laser diode have to cooperate with the driving circuit?

Different from ordinary LED, laser diode is extremely sensitive to working current. Even a small current fluctuation may lead to a drastic change in output power and even burn the device. The function of the driving circuit is mainly reflected in the following aspects:

1. Constant-current drive: ensure current stability and avoid laser diode damage due to current overshoot.

2. Power control: adjust the laser output power according to the actual application scenario.

3. Protection function: realize overcurrent protection, temperature protection and soft start function, and prolong the service life of the device.

4. Modulation function: meet the requirements of high-speed modulation in different scenes, such as optical communication or lidar.

Second, the common types of laser diode driving circuits

In practical application, according to different requirements, laser diode driving circuits can be roughly divided into the following categories:

1. Constant current source drive circuit

This is the most common and basic driving mode. The circuit ensures the constant output current by means of voltage stabilizing chip, triode or operational amplifier feedback.

Advantages: simple structure and low cost.

Disadvantages: single function, lack of protection and modulation ability.

Application scenarios: laser rangefinders and small laser pens with low power requirements.

2. Constant voltage+current limiting drive circuit

This kind of circuit can reduce current overshoot to some extent by adding current limiting protection on the basis of constant voltage power supply.

Advantages: it is relatively safe and can meet some adjustment requirements.

Disadvantages: the control accuracy is low, which is not suitable for high-performance scenes.

Application scenarios: laboratory testing, low-cost consumer electronics.

3. Dedicated laser driver chip circuit

With the increasing demand for laser applications, many special laser driver chips have emerged in the market. This kind of chip often integrates the functions of constant current control, overheating protection, APC (automatic power control) and so on.

Advantages: stable performance, rich functions, and can be directly combined with PD (photoelectric monitoring diode) to realize closed-loop control.

Disadvantages: the cost is high, and there are certain requirements for PCB design.

Application scenario: high-precision applications such as optical fiber communication, medical inspection and industrial measurement.

4. Digital control drive circuit

This kind of circuit combines MCU or FPGA, which can realize digital power regulation, PWM modulation and even temperature control management.

Advantages: high flexibility and programmable control according to requirements.

Disadvantages: complicated design and high cost.

Application scenarios: lidar, 3D sensing, intelligent manufacturing and other systems requiring complex control.

To sum up, different types of driving circuits have their own advantages, and enterprises and R&D personnel can choose the most suitable scheme according to the application requirements.

Third, the advantages of QSI laser diode

As a leading international laser diode manufacturer, QSI of Korea covers red, green, blue and infrared bands, and is widely used in industry, medical care, scientific research and consumer electronics. Its core advantages are mainly reflected in:

1. High reliability: Strict process control and aging screening ensure that the device still runs stably in harsh environments such as high temperature and high humidity.

2. Excellent performance: stable output power and good beam quality, suitable for high-precision optical applications.

3. Full range coverage: QSI has corresponding products for both low-power positioning and high-power cutting and welding.

4. Modularization support: supports customized development by customers and can be directly applied to system-level solutions.

4. Can QSI laser diode be made into laser module?

Laser module is a product that integrates laser diode, driving circuit, optical lens and heat dissipation structure. It can greatly reduce the customer's design threshold and realize plug and play. QSI laser diode has excellent consistency and stability, which is very suitable for making standardized or customized laser modules.

Advantages of modularity:

1. Simplify the application: customers do not need to design the driving circuit separately, but can integrate it directly into the equipment.

2. More stable performance: the module is tested uniformly, and the power output is more reliable.

3. Shorten the R&D cycle: Enterprises can quickly launch new products and seize market opportunities.

4. Multi-scene application: from laser projection, medical detection to intelligent security, it can be directly applied.

At present, QSI has jointly developed laser module products with many partners, and can flexibly customize wavelength, power, packaging form and optical design according to customer needs.

There are various types of driving circuits for laser diodes, ranging from the most basic constant current driving to intelligent digital control, covering different needs from low-cost applications to high-end scientific research fields. With its stability and high performance, Korean QSI laser diode can not only be used as a core device alone, but also be integrated into a fully functional laser module to meet the rapid application needs of customers.