660nm / 680nm / 940nm VCSEL Laser Light Sources

With the continuous advancement of VCSEL (Vertical-Cavity Surface-Emitting Laser) technology, its applications are expanding across medical aesthetics, wearable devices, consumer electronics, and short-range optical sensing.

The 660nm and 680nm wavelengths fall within the visible deep-red spectrum, making them suitable for selected illumination systems, optical sensing, and multi-wavelength applications. The 940nm wavelength belongs to the near-infrared spectrum and is widely used in 3D sensing, facial recognition, distance measurement, and infrared optical sensing.

Leveraging the advantages of VCSEL technology in beam output, wavelength control, and device integration, WEJ offers 660nm, 680nm, and 940nm VCSEL light sources to support diverse optical system designs.

The series features emission angles of approximately 20°, 25°, and 28°, along with multiple package options to meet different requirements for wavelength selection, beam direction, and device integration. These light sources can also be combined with other wavelengths to build multi-wavelength optical systems.

1. Key Product Features

VCSEL Vertical-Cavity Surface-Emitting Technology

Based on VCSEL technology, light is emitted vertically from the chip surface, providing distinctive laser output characteristics and flexibility in optical path design and system integration.

Multiple Beam Angles

Available with approximately 20°, 25°, and 28° emission angles, offering directional beam output and helping optimize illumination coverage and spot distribution.

High Photoelectric Conversion Efficiency

Taking a 680nm model as an example, it delivers a typical optical output power of 10mW at a driving current of 10mA, with a typical power conversion efficiency (PCE) of 32%, demonstrating excellent photoelectric performance.

Precise Wavelength and Narrow Spectral Linewidth

Available in 660nm, 680nm, and 940nm wavelength options. For example, a 660nm model features a peak wavelength range of 660–670nm, with a typical value of 665nm and a maximum full width at half maximum (FWHM) of 2nm, supporting applications requiring precise spectral characteristics.

Symmetrical Annular Far-Field Beam

The far-field beam exhibits a symmetrical annular distribution, providing flexibility in beam shaping and energy distribution for specific optical system designs.

SMD Packaging and Multiple Options

Featuring SMD packaging for convenient automated assembly and integration. Multiple package sizes are available to accommodate different PCB layouts, thermal requirements, and optical designs.

2. Main Applications

The following examples cover typical applications of VCSEL technology across different wavelength ranges. The actual wavelength and device model should be selected according to the optical design and requirements of the end application.

1. Smart Wearables

As wearable devices evolve toward advanced health monitoring and multifunctional integration, VCSEL light sources can be incorporated into optical sensing modules and combined with other wavelengths for physiological signal acquisition.

• Smart Bands and Smartwatches: Used in PPG (Photoplethysmography) sensing for heart rate monitoring, activity tracking, and sleep analysis.

• Blood Oxygen Monitoring: 660nm red light can serve as a candidate red-light channel, while 940nm near-infrared light can be used as a complementary channel for blood oxygen measurement.

• Sports and Health Monitoring Devices: Integrated into optical sensing modules to support activity recognition and physiological data collection.

2. Medical Aesthetics

With their optical output characteristics and compact packaging, VCSEL devices provide additional light source options for medical aesthetics and light-based equipment.

• Laser Hair Removal Devices: VCSEL technology can be incorporated into laser-based hair removal systems, with wavelength selection depending on the treatment design and melanin absorption characteristics.

• Photofacial Devices: Specific wavelengths provide light sources for skin care and aesthetic treatment equipment.

• Laser Therapy Devices: Used in selected light-based therapy systems requiring specific wavelengths.

• Laser Hair Growth Caps: Red and near-infrared light sources can be integrated into devices designed for scalp and hair follicle care.

• Laser Facial Masks and Therapy Devices: Array-based VCSEL integration enables targeted illumination for facial care and professional equipment.

3. Consumer Electronics

With consumer electronics becoming increasingly intelligent and multifunctional, VCSEL light sources offer solutions for short-range sensing, optical recognition, and interactive systems.

• TWS Wireless Earbuds: Near-infrared emission and reception detect changes in reflected signals to identify wearing status, enabling automatic playback, pause, and other smart functions.

• Robot Vacuum Cleaners: VCSEL sources work with optical sensing modules to support environmental perception, SLAM navigation, mapping, and obstacle avoidance.

• AR / VR / MR Devices: Integrated with dedicated optical sensing modules for spatial positioning, gesture recognition, and human-machine interaction.

4. Optical Sensing Applications

With fast response, beam control, and array integration capabilities, VCSEL devices can be combined with other wavelengths for optical sensing systems used in consumer electronics, industrial automation, automotive electronics, and smart home applications.

• 3D Facial Recognition and Biometric Sensing: Work with dedicated optical receivers to support facial recognition, depth sensing, and short-range detection.

• Industrial Robots and Automation: Provide light sources for optical inspection, object detection, and position recognition systems.

• Smart Home Devices: Can be integrated into security systems, smart lighting controls, and smart door locks for proximity sensing and intelligent interaction.

• Multi-Wavelength Optical Sensing Modules: 660nm / 680nm and 940nm sources can be combined according to application requirements to create multi-wavelength optical solutions.

Actual applications should be evaluated based on wavelength, optical output power, driving conditions, and the optical design of the end device.

3. WEJ Multi-Wavelength VCSEL Laser Light Sources

Featuring VCSEL technology, precise wavelength output, narrow spectral linewidth, and directional beam characteristics, WEJ's 660nm / 680nm / 940nm VCSEL series provides versatile light source options for medical aesthetics, smart wearables, consumer electronics, and specialized optical sensing systems.

With a strong focus on semiconductor optoelectronic device development and manufacturing, WEJ is committed to delivering reliable products and customized solutions through professional engineering and consistent quality.

Our expanding multi-wavelength product portfolio, flexible packaging options, and technical support help customers meet diverse requirements for optical