Product technical note
PLD905-180W-M low-temperature-drift six-emitter pulsed laser diode
A model-level technical page covering the six-layer nanostack emitter, 180 W pulsed output, low wavelength temperature drift, optical spot structure, specifications and integration notes.
One Chip,
Six-Layer Emission Structure
Release High Peak Pulse Energy
PLD905-180W-M Using nanostack laser technology, six epitaxial stacked emitters are integrated within a single laser chip. The 110 × 30 μm emitting area, 905 nm near-infrared wavelength, and low wavelength temperature coefficient provide a compact pulse emission solution for ranging and outdoor optoelectronic systems.
Not six discrete chips,
But six epitaxial stacked emitters within a single chip
The core lies in integrating multiple emission layers into a single semiconductor laser chip. Compared with the method of installing multiple independent chips separately, single-chip integration helps to reduce the layout of the light source, minimize assembly differences of discrete components, and provides design space for compact pulsed emission modules.
Integrate multiple emission layers on the same chip to form a six-layer light-emitting structure
The datasheet for the PLD905-180W-M indicates the use of nanostack laser technology, containing 6 epitaxial stacked emitters; the corresponding product’s spot image shows six parallel line-shaped spots. It does not package six individual TO modules together, but achieves integration at the semiconductor chip structural level.
The small-sized emitting window provides a design foundation for a compact transmitter optical engine structure. Here, the size refers to the aperture size given in the specification, not the overall device light spot size.
A multi-layer active emission structure is integrated into a single chip, aiming to achieve higher pulse peak output in a smaller device.
The final spot size, spacing, and uniformity are also affected by packaging, collimating/shaping optics, and driving conditions, and should be verified with actual system testing.
High Peak Pulse Output
Targeting the short-pulse ranging transmitter. High peak output helps increase the instantaneous light intensity of a single emission, but the system's ranging distance also depends on the receiver, target, and optical link.
Single-Chip Integration
A compact emission window combined with a single-chip six-emitter structure can reduce the complexity caused by individually positioning, wiring, and assembling multiple independent laser chips.
Six Linear Light Spots
The specification diagram presents six parallel linear light emission effects and can serve as an intuitive basis for explaining the multi-emission layer structure. Actual energy uniformity should be confirmed by supplier test data.
Six-layer linear beam: makes the structural advantages more intuitive
The original specification diagram shows six parallel magenta linear light spots. This diagram is used to demonstrate the light spot shape and is not intended as quantitative proof of light power uniformity, far-field size, or system-measured distance.
Near-Infrared Laser, one of the common emission bands in ranging systems
905 nm lies in the near-infrared range, which the human eye usually cannot see, so one cannot rely on sight to determine whether it is emitting light, the direction of the beam, or the existence of exposure risks. With appropriate pulse driving and receiver links, it can be used for laser ranging, laser sensing, and lidar applications.
The drive circuit provides controlled peak current to the laser diode, forming nanosecond-level laser pulses.
The target surface reflects part of the incident energy back to the receiving optical system; target reflectivity and orientation will change the echo strength.
The receiver records the echo arrival time, and the controller estimates distance using round-trip flight time. The laser chip is one part of the transmission link, not a complete rangefinder.
Low Wavelength Temperature Coefficient,
Provides the basis for stable light output design under outdoor temperature variations
Outdoor equipment may experience cold mornings, sun heating, and changes in body temperature. The emission wavelength of the laser diode will vary with junction temperature, so in addition to peak power, attention should be paid to the wavelength temperature coefficient, operating temperature range, and system temperature compensation strategy.
Wavelength Temperature Coefficient
A typical indicator of the change in emission wavelength for each 1 K change in representative temperature. Understand the temperature difference increment as 1 K = 1°C, with a typical temperature coefficient of about 0.10 nm per degree Celsius.
Component selection for outdoor conditions
The operating temperature range refers to the device's specified working environmental conditions and does not mean that all temperature points maintain exactly the same wavelength, power, or beam shape. Drive strategy, thermal resistance, mounting heat dissipation, and duty cycle all need to be considered in system design.
Predictable Temperature Variation
The temperature coefficient provides a typical reference for wavelength changes with temperature, helping system engineers plan temperature compensation, calibration, and environmental testing.
For Outdoor Systems
An operating temperature range of −40°C to 85°C helps assess the device's adaptability for unmanned platforms, field sensors, and outdoor ranging equipment.
Consistency Depends More on Data
Integration of multiple emission layers in a single chip can reduce differences in discrete chip assembly; batch consistency, light spot uniformity, and power distribution should be verified through mass production sampling, grading, and reliability reports.
From drone range measurement to special optoelectronics,
Make the emitting end smaller, stronger, and integrable
As a pulsed laser emitter, the PLD905-180W-M can be evaluated for use in the following ranging and sensing devices based on system optics, detectors, and drive design. The descriptions here indicate potential application directions and do not imply that a single device alone can achieve a complete system function.
Drone Ranging and Obstacle Avoidance
It can be evaluated for airborne altitude measurement, short-range obstacle sensing, and airborne laser ranging subsystems. The compact TO56 package is favorable for embedding in space-constrained transmitter modules.
Lightweight Integration DirectionLiDAR / Laser Sensor
Nanosecond-level pulses combined with a time-measuring receiving link can be used for evaluating distance sensing solutions. The final detection capability depends on the transmit and receive optics, detector, ambient light, and algorithm.
Pulse Time-of-Flight RangingMilitary and special optoelectronic equipment
It can be used as the laser emission end device for ranging, platform environmental sensing, and other specialized optoelectronic equipment for system-level selection. Verification should be carried out according to the environmental, reliability, electrical, and optical requirements of the complete device.
System-Level Evaluation and VerificationHandheld Laser Rangefinder
Designed for portable distance measurement devices, overall solutions can be balanced around peak output, pulse width, receiving aperture, and power consumption.
Portable RangefindingOutdoor engineering and topographic survey
Under conditions where target distance, ambient light, and target reflectivity allow, it can be used for laser source selection in civil engineering and outdoor distance sensing devices.
Outdoor MeasurementHigh-Reliability Optoelectronic Module
Single-chip multi-emission-layer structure, metal TO56 packaging, and clearly defined operating temperature range provide the basis for mechanical, electrical, and environmental adaptation of the emitter module.
Device-Level PlatformApplication note: This article introduces the device's application directions and does not constitute a commitment to specific terminal performance. Long-distance measurement capabilities should be confirmed through testing of the complete equipment under target operating conditions.
Understand peak power, pulse energy, and average power
"180 W peak power" describes the instantaneous optical power during the pulse and does not mean the device continuously outputs 180 W. By modifying the pulse width and repetition frequency below, you can directly observe how the theoretical pulse energy and average optical power estimates change.
The above results are only intended to understand the relationship between pulse parameters; they are not product test values and do not replace the rated conditions in the specification. The calculator alone should not be used to judge whether the device can operate under any combination.
905 nm wavelength drift calculation compared with ordinary devices
Using 25°C and 905 nm as the reference, input the actual operating temperature to compare the low-wavelength temperature coefficient of the PLD905-180W-M with the 0.28 nm/°C reference shift of ordinary devices.
Set Operating Temperature
0°C temperature change relative to the 25°C reference point.
The result is a linear estimate based on the typical temperature coefficient, used to compare temperature drift trends. The actual wavelength is also affected by chip batch, junction temperature distribution, drive, and thermal design, and is ultimately subject to test data and the official datasheet.
Overview of Key Parameters
The following parameters are organized according to the PLD905-180W-M (2.0-MP-M/Z) product datasheet. The specified ambient temperature for conventional characteristic parameters is 25°C; typical values do not guarantee exact consistency with every device.
| Parameters | Symbol | Minimum Value | Typical Value | Maximum / Rated Value | Unit |
|---|---|---|---|---|---|
| Emission Wavelength | λpeak | 895 | 905 | 915 | nm |
| Spectral width (FWHM) | Δλ | — | 7 | — | nm |
| Wavelength Temperature Coefficient | Δλ/ΔT | — | 0.10 | — | nm/K |
| Peak Output Power (Characteristic Parameters) | Popt | 124 | 144 | 182 | W |
| Peak output power (short-term operating rated value) | Ppeak | — | — | 180 | W |
| Threshold current | Ith | 0.5 | 0.75 | 1 | A |
| Operating Current | Iop | 20 | 25 | 35 | A |
| Operating Voltage | Vop | 19.6 | 22 | 26.2 | V |
| Light-Emitting Area Size (Aperture Size) | — | — | 110 × 30 | — | μm |
| Beam Divergence Angle (Parallel to PN Junction, FWHM) | Θ∥ | — | 9 | 10 | ° |
| Beam Divergence Angle (Perpendicular to PN Junction, FWHM) | Θ⊥ | — | 25 | 28 | ° |
| Pulse width (FWHM) | TP | — | — | 100 | ns |
| Duty cycle (maximum rated value) | Dc | — | — | 0.1 | % |
| Reverse Voltage | VR | — | — | 20 | V |
| Operating Temperature | Top | −40 | — | +85 | °C |
| Storage Temperature | Tstg | −40 | — | +100 | °C |
Standard working conditions in the datasheet: pulse width 100 ns, frequency 3 kHz, operating current 25 A, ambient temperature 25°C. The product introduction mentions suitability for 1–100 ns short pulse operation, but actual use must follow the corresponding drive, thermal design, and duty cycle limitations. The typical value of 144 W and the maximum value of 182 W in the peak power characteristics table, along with the short-term rated value of 180 W, belong to different parameter categories; when selecting, the test and usage conditions confirmed by both parties should be taken as the standard.
Understanding working window using device curves
The specification provides the power-voltage-current relationship and spectral curves, which can serve as a reference starting point for selecting drive circuits and optical receiving chains. The data in the figures should be interpreted in the context of their test conditions.
Power / Voltage / Current characteristicsDatasheet Conditions: Pulse Width 100 ns, Frequency 3 kHz, Ambient Temperature 25°C
Emission Spectral CharacteristicsTypical central wavelength 905 nm, typical spectral width 7 nmLaser chip performance requires coordination of driving, thermal design, and optical system
For high peak pulse laser diodes, the device is not a plug-and-play "independent ranging module." To achieve stable light output, it is recommended to simultaneously verify drive pulses, package thermal paths, beam shaping, and receiver synchronization during the prototype stage.
- Confirm that the driver peak current, pulse width, and repetition rate comply with the datasheet limits.
- Evaluate average thermal load, thermal installation, and junction temperature changes based on pulse energy and duty cycle.
- Collimate or shape optics for six-line spot configuration, measure spot spacing and energy uniformity of each layer.
- Check center wavelength, peak power, direction, and receiver link sensitivity within the target temperature range.
- Perform ESD protection, soldering process control, condensation protection, and overall laser safety assessment.
Laser Safety Tip: 905 nm belongs to the invisible near-infrared range
It should not be considered safe simply because the beam is invisible to the naked eye. The datasheet indicates that such devices may emit highly concentrated invisible infrared light, which poses potential hazards to the eyes; the entire product should be evaluated and equipped with protection according to applicable laser product safety requirements such as IEC 60825-1. During device operation, the beam should be kept away from eyes and skin, and electrostatic protection measures should be taken.
Looking for a suitable solution for high-peak, low-temperature-drift 905 nm emitters
Sample evaluation and system integration requirements can be discussed based on pulse width, repetition frequency, operating temperature range, package pins, and beam structure.
