company blog about Supply Rohm Laser Diodes:High Output/Multi Beam/Red/Infrared/Dual Wavelength Laser Diodes

Supply Rohm Laser Diodes:High Output/Multi Beam/Red/Infrared/Dual Wavelength Laser Diodes

Shenzhen Mingjiada Electronics Co., Ltd. specialises in the distribution of electronic components, supplying genuine, original manufacturer products. With stable stock levels, original manufacturer quality assurance and technical support capabilities, we provide our customers with chip solutions.

Key Supply Advantages

Genuine, original manufacturer products with guaranteed quality: All products are genuine, original manufacturer products. We provide comprehensive traceability documentation, eliminating refurbished or loose new chips to ensure the stable operation of equipment;

Full-range stock, rapid delivery: We maintain a substantial inventory of chips, supporting both small-batch trial orders and large-scale supply, thereby shortening lead times;

Two-way supply and demand services: In addition to supply, we offer long-term buy-back services for various electronic chips, helping businesses clear idle stock and reduce costs.

I. Red Laser Diodes (635nm/658nm/660nm Bands)

Core Wavelengths and Representative Models

Mainstream 635nm pure red light, 658nm/660nm standard red light; benchmark models: RLD65MZT7, RLD63NPC5; standard packaging: φ5.6mm metal tube housing.

Key Product Features

Low threshold, high-speed response: Optimised active layer structure, threshold current as low as 20mA, fast pulse response, suitable for high-speed barcode scanning and positioning sensors;

Controllable beam: Vertical divergence angle of 8°, horizontal divergence angle of 27°, uniform spot with no stray light, built-in PD photodetector monitoring pin for real-time, stable optical power output;

Wide-temperature stability: Maximum operating temperature of 85°C; minimal wavelength temperature drift; no brightness degradation during long-term operation in outdoor and industrial environments;

Comprehensive power coverage: Continuous optical output ranging from 7 mW to 30 mW, with sub-categories including low-power and medium-power high-brightness variants.

Typical Applications

Barcode scanners, laser line projectors, vision-based positioning for humanoid robots, medical optical inspection, DVD reading, and laser pointer modules.

II. Infrared Laser Diodes (Two major wavelength bands: 780 nm and 905 nm, including high-output pulsed variants)

The infrared product line is divided into two main branches: general-purpose low-power infrared and LiDAR ultra-high-pulse-output infrared, serving as core light sources for ranging and spatial perception.

780nm General-Purpose Infrared (RLD78NZM5 Series)

Specifications: Centre wavelength 793nm, continuous output 6–20mW, stable single-mode beam;

Advantages: High reliability, low power consumption; suitable for CD drives, laser printers and short-range infrared sensing;

905 nm High-Output Pulsed Infrared (RLD90 Series, industry benchmark)

Representative models: RLD90QZW5 (25 W), RLD90QZW3 (75 W), RLD90QZW8 (120 W), RLD8BQAB3 (8-channel array, 1 kW class);

Key technical highlights:

Ultra-narrow emission width of 225 μm, 22% narrower than competing products, significantly improving ranging resolution;

Industry-leading photoelectric conversion efficiency of 21%, reducing overall system power consumption;

Wavelength temperature drift of 0.15 nm/°C, a 40% improvement over standard devices, allowing for the use of narrow-band filters to enhance the signal-to-noise ratio;

The multi-channel array solution integrates eight laser emitters into a single chip, significantly reducing the size of the LiDAR module;

Applications: In-vehicle ADAS LiDAR, 3D ToF ranging for robotic vacuum cleaners and humanoid robots, AGV industrial navigation, drone obstacle avoidance, long-range security surveillance, and laser rangefinders.

III. Multi-beam Laser Diodes (Dual-beam / Quad-beam, flagship products for 3D printing)

ROHM leads the global market share for multi-beam laser diodes, specialising in dual-wavelength multi-channel parallel emission designs for 780 nm infrared and 660 nm red light.

Product Specifications

Mature mass production of 780nm dual-beam models; concurrent development of 780nm quad-beam and 660nm red dual-beam/quad-beam series; standardised beam spacing of 110μm; excellent synchronisation across multiple emission channels;

Key Advantages

Synchronised multi-beam emission increases the scanning speed of printing equipment by 2 to 4 times; standard light source for high-speed photocopiers and laser printers;

Integration of multiple laser beams into a single device reduces the number of components, simplifies optical path design and lowers overall equipment costs;

Power consistency deviation between beams is <5 per cent, ensuring no variations in print density and delivering uniform, fine imaging;

Application Scenarios

High-speed laser printers, digital multifunction devices, industrial laser exposure equipment, and multi-line optical scanning modules.

IV. Red + Infrared Dual-Wavelength Laser Diodes (658 nm red + 782 nm infrared integrated on a single chip)

Representative Models: RLD2WMUL3, RLD2WMFV2, RLD2WMUV2. Utilising a proprietary integrated process with a real-index waveguide, a single package houses two independent laser emitting cavities for red and infrared light, in a 4-pin φ5.6 standard package.

Key Features

Integrated Design: A single device simultaneously emits 658 nm red light (for DVD reading) and 782 nm infrared light (for CD reading), supporting dual-medium optical reading;

Independent dual-channel control: The red and infrared drive circuits are completely isolated; the threshold currents and output powers of both channels are independent and stable, with no mutual interference;

Low optical loss: The real-index waveguide eliminates light absorption within the cavity, resulting in output stability in high-temperature environments that is significantly superior to traditional lossy waveguide solutions;

Built-in dual-channel PD monitoring: Both the red and infrared channels are equipped with photodetector pins, enabling real-time closed-loop control of both optical power channels;

Application Areas

Portable DVD/CD drives, in-car audio-visual optical heads, ultra-slim recorders, compatible optical reading modules, and compact integrated barcode scanning devices.

V. Summary of ROHM’s Core Advantages for Laser Diodes

Full power and wavelength coverage: Comprehensive coverage ranging from low-power continuous wave (mW-level) to ultra-high-output pulsed (kW-level) applications, with complete wavelength bands available for red light (635–660 nm) and infrared (780/905 nm);

Diverse optical path configurations: Three architectural types—single-beam, multi-beam array and integrated red-infrared dual-wavelength—provide a one-stop solution for both single-function and multi-function optical equipment;

High-reliability industrial-grade standards: Wide operating temperature range of –40°C to 85°C, shock-resistant metal CAN packaging, long service life with low degradation, suitable for the demanding operating conditions of automotive and industrial robotics applications;

Simplified optical system integration: Standardised beam divergence angles and low wavelength temperature drift enable high-precision ranging and imaging when paired with low-cost optical filters.

VI. Application Scenarios in Specific Industries

Humanoid robots: 905 nm high-output infrared LDs for 3D ToF depth sensing, 660 nm red LDs for visual positioning, and multi-beam array modules for comprehensive obstacle scanning;

Automotive Electronics (ADAS): 120W pulsed infrared laser diodes are used to create long-range automotive LiDAR, enabling obstacle detection at distances of up to 100 metres;

Office Printing Equipment: 780nm dual/quad-beam infrared LDs for high-speed black-and-white and colour laser printing;

Consumer optoelectronics: Dual-wavelength LDs for portable optical drives; single-tube red light for barcode scanning and laser line marking;

Industrial automation: High-power pulsed infrared light sources for AGV navigation, production line visual inspection, and long-range infrared security detection.