With the popularity of laser diodes, many people confuse red laser diodes with light-emitting diodes. Do you know the difference between red laser diodes and light-emitting diodes? Where is Korean QSI red laser diode? Today, Xiaobian will answer it together.

In recent years, with the continuous progress of optoelectronic technology, lasers and LED devices are widely used in many fields such as communication, display, medical treatment, detection and consumer electronics. Among them, Red Laser Diode and Red LED are the two most common light sources. However, because they are similar in appearance, some users often confuse them and even think that they are a kind of products. In fact, there are essential differences between these two types of devices in terms of luminous principle, performance characteristics and application fields.

First, the difference in the principle of luminescence

1. Red light emitting diode (LED)

LED works through the electroluminescent effect of semiconductor PN junction. When the current is injected forward, electrons and holes recombine to release photons, thus emitting red light. Its emission spectrum is wide (usually above 20nm), the output light is incoherent, and the beam divergence is large.

2. Red Laser Diode, LD)

Laser diode is also based on semiconductor material, but it has an optical resonator in structure. After current injection, the number of particles in the device is reversed, and photons are amplified and fed back in the resonant cavity, finally producing coherent, monochromatic and directional laser. Its emission wavelength is usually concentrated in the range of 630nm-690nm, and the beam collimation is much higher than that of LED.

It can be seen that LED is a common spontaneous radiation source, while laser diode is a stimulated radiation source, which is the fundamental difference between them.

Second, the difference in optical performance

1. Spectral width

LED: Wide emission bandwidth and obvious dispersion.

Laser diode: the line width is extremely narrow, which can realize single longitudinal mode or multi-longitudinal mode output and is suitable for high-precision applications.

2. Brightness and visibility

LED: the brightness is limited, and the light spot is not obvious under long-distance conditions.

Laser diode: under the same power, the brightness and visibility are significantly better than LED, and it is still clearly visible within hundreds of meters or even thousands of meters.

3. Divergence angle

LED: The divergence angle is large, and extra lenses are needed to collect light.

Laser diode: small divergence angle, easy to focus into a high energy density spot.

4. Modulation response

LED: The modulation speed is slow, which is suitable for low-speed indication and lighting scenes.

Laser diode: high modulation rate, which can meet the requirements of high-speed optical communication and optical storage.

Third, the differences in application fields

1. Red LED

Mainly used in lighting, display, indicator light, backlight, automobile lamps, etc., characterized by low cost, long life and soft light source.

2. Red laser diode

It is widely used in:

Optical storage devices (such as DVD, Blu-ray drive)

Laser printer, bar code scanner

Optical fiber communication system

Medical and biological testing

Laser ranging and positioning

Stage Performing Arts and Laser Lighting

High-precision industrial detection and scientific research experiments

It can be said that red laser diode is the core light source for precision applications and high-performance scenes, while LED is more suitable for daily lighting and display.

Fourth, the advantages of QSI red laser diode

As an internationally renowned semiconductor laser manufacturer, QSI of South Korea has a mature technology accumulation and a wide product line in the field of red laser diodes:

1. Multi-wavelength coverage

QSI red laser diode covers the range of 630 nm–690 nm, which can meet the different needs of consumer electronics, industrial measurement and medical detection.

2. Rich power range

Products ranging from milliwatt to hundreds of milliwatt are complete, which can be used for handheld devices, scientific research and industrial laser systems.

3. Stability and reliability

QSI products adopt advanced epitaxial technology and strict quality inspection, which have the characteristics of low threshold current, high photoelectric conversion efficiency and long life.

4. A variety of packaging forms

TO-Can, C-Mount, butterfly package and other diversified options, which is convenient for customers to integrate applications in different systems.

5. Where can I get QSI red laser diode?

As the general agent of Korean QSI in China, we have long been committed to providing domestic users with laser diode products directly supplied by the original factory and guaranteed by genuine products, and providing supporting technical support and application consultation.

1. Regular channel supply

Users can obtain QSI red laser diode through our company's official channels to ensure the reliable source of products and avoid the risk of counterfeiting.

2. Professional technical services

We not only provide product sales, but also provide selection guidance, application scheme design and after-sales service to help users integrate laser devices into practical applications more efficiently.

3. Covering a wide range of industries

At present, QSI red laser diode has served many fields in China market, such as optical communication, laser ranging, medical treatment, scientific research and education, consumer electronics and so on.

4. Exhibition and cooperation opportunities

We will continue to participate in domestic and international optoelectronic industry exhibitions, display the latest QSI products, and share technological achievements with industrial chain partners.

To sum up, although red laser diode and red light emitting diode are similar in appearance, there are significant differences in luminous mechanism, performance, application field and market positioning. Laser diode has become an indispensable device in modern optoelectronics industry because of its high brightness, narrow spectral line and excellent directivity.

Korean QSI, as the world's leading laser diode manufacturer, is providing strong support for China and the global market with its advanced technology and stable quality. As the general agent of QSI in China, we will continue to adhere to the principle of "professionalism, reliability and service first", bring more high-quality red laser diode products and overall solutions to our customers, and help the high-quality development of China's laser industry.