We all know that many businesses will struggle whether to buy laser diodes made in China or QSI. Today, Longxingda Technology will give you a brief introduction.

In the laser device market, domestic lasers (including domestic laser diodes) have developed rapidly in recent years, and the gap between products and imported brands is also narrowing in price and some properties. But when it comes to overall comprehensive performance, especially in some key technologies or application scenarios, brands like QSI in South Korea still have many obvious advantages. Next, I will analyze the difference between QSI laser diodes and domestic ones from multiple dimensions, and why choosing QSI can be more reliable and more secure.

I. What are the advantages of QSI?

1. Strong integrity of technology and production chain.

QSI itself has complete capabilities in epitaxial wafer (EPI), wafer manufacturing (FAB) and packaging (PKG). It can control key processes and improve the consistency and reliability of devices.

In terms of packaging form, besides the standard TO package, there are also space-saving designs such as "D-cut/I-cut", which are suitable for small or integrated devices.

2. Better performance stability and consistency.

QSI's single-mode/multimode laser diode has been strictly verified in optical and electrical characteristics (such as threshold current, slope efficiency, output power stability, directivity, temperature drift, etc.). This consistency is very important for industrial applications or scientific research projects that require long-term stable work.

Under the change of working environment (temperature, vibration, power supply fluctuation, etc.), the performance degradation and failure rate are relatively lower.

3. Life and reliability

QSI products pay more attention to heat dissipation, temperature resistance, antistatic and overcurrent prevention in design and packaging. For example, in the datasheet, the labels of current, voltage, working temperature range, storage temperature range and limit value are strict.

In practical application, when the PD feedback loop (APC／AFC, etc.) is used, the optical power fluctuation can be effectively controlled, and the device life can be longer. Many low-power LD products of QSI are equipped with PD for power monitoring and stability control.

4. The wavelength and power specifications are complete.

The wavelength of QSI covers from visible red to near infrared (for example, 635nm, 650nm, 670nm, 780nm, 805-850nm, 905nm, etc.).

The output power can range from several milliwatts to several hundred milliwatts. For red light, medium and low power applications; For infrared, QSI also has a certain high-power model in IR band.

5. Product customization and packaging flexibility

QSI not only provides standard TO- packages, but also provides small packages (such as 3.3mm packages and space-saving D-cut/I-cut packages) to adapt to some products that require more space or integration.

For those with extreme performance or environmental requirements (high temperature, high humidity, strong vibration, etc.), there may also be reinforced packaging or environmental specifications to choose from.

QSI laser diode

Advantages and disadvantages of domestic laser diodes (compared with QSI)

For better comparison, we can also look at the advantages and disadvantages of domestic laser diodes in the market.

Advantages of domestic production

The price advantage is obvious: the cost, labor and taxes are usually lower than those of imported products. For application scenarios with low and medium power and less extreme performance requirements, domestic products are good enough and cost-effective.

Strong localization service: fast response time for mass production, samples, maintenance and technical support; No language/time difference barriers in communication; The lead time may be shorter.

In some special purpose/small batch markets: In order to seize the market, domestic manufacturers will be able to quickly follow up or even customize the specific wavelength or small power and small volume packaging.

Domestic disadvantages (compared with imported/international brands such as QSI)

There is a slight gap between stability and consistency: especially in mass production, temperature drift, power fluctuation and life difference may be greater.

Weak adaptability in extreme environment: the design and test of high temperature, long-term continuous operation, antistatic and ESD surge prevention may not be so perfect.

Technology accumulation time is short: the experience in epitaxial quality, wafer technology and internal design (thermal resistance, package heat dissipation, beam shaping, mode control, etc.) may not be as good as that of established foreign companies/enterprises like QSI.

Specification/certification may not be uniform: for the international market or industrial/medical/national defense fields with high safety standards, imported brands are usually more perfect in certification, documents and reliability test reports.

QSI laser diode

Third, why is QSI a better choice through Longxingda Technology?

Combining the above-mentioned technical advantages of QSI with the domestic status quo, and the role of Longxingda Technology as the general agent of QSI in China, it has the following advantages:

Authentic guarantee: avoid counterfeit, refurbished and low-quality products from entering the market.

Technical selection support: Longxingda can help users choose the most suitable model according to the application scenarios (temperature range, power demand, service life, beam quality, etc.) to avoid blind comparison and trampling.

After-sales service and guarantee: if there are problems that do not meet the specifications in use (such as life decay, insufficient output power, serious performance drift, etc.), there are regular agents to track replacement or maintenance.

Consistency between samples and bulk supply: in the development stage, the sample verification performance can be obtained first, and then consistency can be maintained during bulk purchase.

Localized logistics and cost control: Although it is an imported brand, logistics, customs clearance and cost can be optimized through the general agent.

Generally speaking, QSI laser diode has strong competitiveness in several key indexes (stability, consistency, lifetime, packaging, diversified wavelength and power selection, international quality standards, etc.). Although domestic laser diodes are more and more attractive in terms of price and local service, QSI still has obvious advantages in applications that require high performance and reliability, such as industrial automation, ranging navigation, medical care, security monitoring, scientific research instruments, etc.