QSI Laser DiodeLG UVLEDLG White LED English中文    Oct 14,2025
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PRODUCT
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Address:7th Floor, Gaofeng Building, Dalang Street, Longhua District, Shenzhen

Website:www.longstartech.com.cn

TEL:0755-2556 9680

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Email:James@longstartech.com.cn

Contact Person :Zheng

Korean QSI 635nm 5mw laser diode

QL63E4SX

Part Name:Korean QSI 635nm 5mw laser diode

Part No:QL63E4SX

Wavelength:635nm

IOP:23mA

Optical Power:5mw

Part Package:TO-56

APPLICATION

◆ Architectural decoration instrument market: 1. Line-throwing instrument manufacturers 2. Leveling instrument manufacturers ◆ Measuring instrument market: 1. Manufacturers of laser range finders, total station instruments, etc. ◆ Toy and stage lighting market: 1. Laser pointers, finger Pen display manufacturers 2. Stage, karaoke booth and other equipment manufacturers ◆ Barcode scanner market ◆ Other markets 1. Gun sight manufacturers 2. Laser treatment instrument manufacturers 3. Sensors, laser headlights, etc

SPECIFICATION

SPECIFICATION: Know

PRODUCT DETAILS

We all know that QSI laser diodes occupy a very large market share, but many domestic enterprises have not used QSI laser diodes. Today, I will briefly introduce the quality of QSI laser diodes to you.

Laser Diode Company Background & Product Category Situation

1. Basic information and capabilities of the company

QSI is a laser diode/semiconductor laser manufacturer in South Korea. QSI possesses integrated manufacturing capabilities ranging from EPI (epitaxial wafers), Fab (wafer processing), to PKG (packaging). In other words, its manufacturing process covers core aspects from chip design/epitaxial growth to packaging.

2. Product line and technical specifications

QSI's products include red lasers (wavelength 635-680nm), near-infrared/infrared laser diodes (bands such as 780-940nm), and infrared VCSELs. Their applications span laser scanning, printers, LiDAR, facial recognition, sensors, and more.  

In terms of power and wavelength, there are types with short wavelengths and low power (such as 5-100mW, etc.), as well as models with medium power. For example, models with 808nm/200-500mW are mentioned in the product line.

3. Declared quality/reliability

"From chip design to packaging, we achieve full-process independent production and continuously innovate to meet 100% of our customers' product needs." Such statements are a sign of manufacturers claiming to have high control capabilities and quality control.

The situation of Longxingda Technology as the general agent of QSI in South Korea

1. Business and positioning

Shenzhen Longxingda Technology Co., Ltd. is a general supplier specializing in deep ultraviolet (UVC) LEDs and Korean QSI laser diodes. Specifically, in the Chinese market, it introduces QSI products to the country and serves as the general agent.

It primarily specializes in QSI laser diodes, UV LEDs, laser modules, epitaxial wafers, etc. It also promotes certain typical models, such as 780nm 30mW for lidar, 830nm for projection, and 650nm for PM2.5 detection.  

Quality assessment & pros and cons (based on existing data + industry norms)

Based on the above, my comprehensive evaluation is:

Advantages:

Comprehensive manufacturing capabilities: QSI's full-process manufacturing capabilities (epitaxy + packaging + finished products) mean a strong grasp of quality control. For devices such as laser diodes, which are sensitive to reliability, wavelength stability, temperature rise, lifespan, etc., full-process control is a plus.

Wide product range: Diverse wavelengths and a large span of power levels provide flexible selection options.

The market validation has a certain foundation: the manufacturer claims that it has been "validated in the global market", with export and application cases (such as sensors, printers, LiDAR, etc.). The agent has also applied it in multiple scenarios. Such background indicates that the product is at least accepted in certain applications.

The agent is present and provides detailed promotion: As the general agent, Longxingda has a clear product line, along with project areas and application descriptions, and can offer advantages such as domestic support, after-sales service, and inventory preparation.

Overall, based on public information, QSI's laser diodes are quality and competitive products. As the general agent, Longxingda has certain strength and channels in the Chinese market. If your application has high requirements for stability, lifespan, temperature drift, and wavelength accuracy, QSI is a brand to consider;


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