Product technical note
A model-level technical page covering the 40 x 18 um emitter, four-layer stack, FAC fast-axis compression, 40 W pulsed output, spot characteristics and single-photon ranging integration.
PLD905-40W-MCL is based on a 40 × 18 μm tiny emission area, using FAC fast-axis compression design and a single-chip four-epitaxial-stacked emitter structure, targeting system requirements such as small spot, long-distance ranging, and precise target selection.
For ranging systems, the transmitting end must not only provide sufficient peak power but also be designed together with collimating optics, receiving field of view, and target size. A finer spot helps improve target selectivity, but the final performance must be confirmed through complete optical system testing.
The small-sized chip emission area provides a design basis for compact optical systems. Combined with suitable collimation and shaping lens sets, it helps control the emitted beam and is optimized for smaller target illumination areas.
The product specification clearly adopts a Fast Axis Collimation (FAC) design. It is aimed at shaping the laser diode output light to help the system deal with the divergence of light emitted from the chip; lens configuration and assembly quality affect the final beam size.
A single chip contains 4 epitaxially stacked emitters, forming the four-layer lighting effect shown in the datasheet. The integrated design reduces the discrete installation and alignment steps required for multiple separate emitter chips.
When facing golf flags, small reflective targets, or complex backgrounds, a small spot can reduce the proportion of the beam covering the surrounding background, helping the system concentrate ranging energy on the desired measurement point.
Select two 905 nm lasers above and below, set up collimating lenses for each, and compare the 1200 m spot results with simulated spot changes side by side on the right.
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Calculate the typical luminous area and FWHM divergence angle using the database, and make a simplified estimate according to the Gaussian beam far field and diffraction limit. The simulated spot uses a logarithmic scale, making it easier to observe both meter-scale original spots and sub-meter collimated spots; actual results still require full system testing.
The multi-emitter layer structure inside the chip is not the same concept as the final spot at the target. Below we explain the relationship between 'chip structure — emitted divergence — optical shaping — target spot' separately.
The image comes from the PLD905-40W-MCL (V3.0) datasheet. It shows the near-field/emission effect of the device and is not equivalent to a far-field target spot test.
The schematic structure is used to help understand the stacking relationship; the actual internal epitaxial structure of the chip is subject to the manufacturing process and device cross-section data.
Small emission area and four-layer epitaxial stack structure provide pulsed light output.
Use optical elements to control the divergence angle in different directions.
Beam size varies with distance, optical design, and assembly errors.
Confirm spot size, uniformity, and energy distribution through prototype testing.
PLD905-40W-MCL can serve as a 905 nm pulsed emission source, embedded in laser rangefinders, laser sensors, and drone ranging systems. Ranging distance, accuracy, and anti-interference ability are determined by the complete transmit/receive link.
Targets like flagpoles are relatively small with rich surrounding backgrounds. Small spot emission design helps reduce the proportion of the beam covering background areas, improving target selectivity together with the receiving field of view and algorithms.
FLAG LOCK · TARGET SELECTIVITYCombined with high-sensitivity single-photon detectors, narrow-band filters, time-correlated detection electronics, and an appropriate receiving aperture, a long-distance weak-echo ranging link can be constructed. The specific ranging distance in kilometers cannot be guaranteed by the transmitter parameters alone.
SINGLE-PHOTON RECEIVER SYSTEMThe lightweight TO56 transmitter can be used for the development of airborne ranging sensors, near-to-far distance measurements, and emission-end solutions for spatial perception. The full system needs to verify vibration, temperature, power consumption, and eye safety requirements.
UAV RANGING · OBSTACLE AWARENESSSuitable for evaluation in professional laser rangefinders, industrial measurement, and special optoelectronic systems. Its advantages lie in the compact device, short pulse output, and compatibility with small spot optical schemes for system integration.
SPECIALTY OPTOELECTRONICSRegarding "obstacle penetration": A small spot does not mean the laser can penetrate opaque objects. A more accurate system benefit is in sparse occlusion environments like branches and leaves, combined with pointing and echo processing, trying to select targets behind gaps while suppressing part of the background mixed echo; actual effects must be confirmed by field testing.
Compared with a solution consisting of multiple independent laser chips, single-chip four-emission-layer integration can reduce the assembly and alignment steps between discrete chips; the specific mass production consistency still needs to be evaluated based on batch data, aging tests, and full system verification.
The following images are taken from the typical characteristic curves in the product datasheet to show device characteristic trends; actual values and discrete ranges are subject to the corresponding test reports.
Specification standard conditions: Pulse width 100 ns, frequency 3 kHz, ambient temperature 25°C.
Typical spectral width approximately 7 nm; emission wavelength varies with junction temperature and operating conditions.
Used to understand divergence distribution in different directions; final collimation effect depends on system optical design.
Includes the PLD905-40W-MCL and PLD905-40W-MCL-2.0 versions. Before procurement and assembly, please verify mechanical dimensions and pin definitions against the current official drawings.
The following parameters are from the "PLD905-40W-MCL (V3.0)" datasheet. Unless otherwise specified, characteristic parameters are defined at TA = 25°C.
| Parameters | Typical values / range | Unit | Description |
|---|---|---|---|
| Product Model | PLD905-40W-MCL / PLD905-40W-MCL-2.0 | — | TO56 Metal Package |
| Peak Output Power | 40（37–44） | W | Typical value 40 W; maximum rated value in datasheet 44 W (short-term operation) |
| Emission Wavelength | 905（895–915） | nm | Specification Characteristics Parameters |
| Spectral width (FWHM) | 7 | nm | Typical Value |
| Wavelength Temperature Coefficient | 0.28 | nm/K | Typical value; wavelength is not constant |
| Epitaxial stacked emitter | 4 | Layer | Single-Chip Integration |
| Light-emitting area size | 40 × 18 | μm | Chip light-emitting area, not the spot size on the target surface |
| Operating Pulse Width Range | 1–100 | ns | Applicable range given by product characteristics; ultimately based on driving conditions. |
| Standard operating conditions (datasheet terminology) | 100 ns / 3 kHz / 12 A / 25°C | — | For Typical Characteristic Curve Conditions |
| Operating Voltage | 12.6（12–13.2） | V | Typical values (TA = 25°C) |
| Operating Current | 12（11–13） | A | Typical values (TA = 25°C) |
| Threshold current | 0.75（0.5–1） | A | Typical values (TA = 25°C) |
| Beam Divergence Angle (Parallel to PN Junction, FWHM) | Typical 9 / Maximum 10 | ° | Specification Definition |
| Beam Divergence Angle (Perpendicular to PN Junction, FWHM) | Typical 6 / Max 8 | ° | Specification Definition |
| Operating Temperature | −40 to 85 | °C | Device Operating Range |
| Storage Temperature | −40 to 100 | °C | Storage Range |
| Reverse Voltage | 20 | V | Maximum rating |
| Duty cycle | 0.1 | % | Short-term operating conditions in the maximum rated value table |
Parameter note: The typical data in the datasheet are statistical results and do not guarantee that each device exactly equals the typical value. Device operating conditions, pulse shapes, junction temperature, and driving circuits all affect the actual output.
High peak power does not necessarily mean high average power. For a pulsed laser, pulse width and repetition rate jointly determine energy output and duty cycle.
Drag the parameters on the left to observe the duty cycle changes. The device's actual operation must simultaneously meet pulse width, peak current, temperature rise, maximum rated value, and driving circuit constraints.
The current duty cycle is below the 0.1% maximum rated reference in the datasheet, but specific test conditions and the full device ratings still need to be confirmed.
Estimation formula: Single pulse energy ≈ peak power × pulse width; average power ≈ single pulse energy × repetition rate. The calculation assumes a rectangular pulse; the actual pulse energy needs to be measured based on the real waveform integration; the calculated results must not replace product specifications or safety evaluations.
No. This is the chip’s emitting area size. The spot on the target is also affected by divergence angle, collimating lens focal length, lens aperture, assembly, and propagation distance. It is recommended to confirm via complete system spot testing.
No. This model is a pulsed laser diode, and 40 W is the typical peak output power. The average optical power depends on the pulse waveform, pulse width, and repetition rate.
It cannot be guaranteed by the transmitter alone. Long-distance single-photon ranging requires supporting detectors, receiving optics, narrow-band filtering, time measurement electronics, and background suppression algorithms, combined with target reflectivity and environmental testing.
Not implied. A small spot mainly helps with target selection and reducing part of the background mixing. For opaque objects, 905 nm laser cannot be simply advertised as penetrative; scenarios like gaps in sparse vegetation should be described according to actual test results.
905 nm is invisible near-infrared light and may cause eye damage. The specification requires that devices follow the IEC 60825-1 laser product safety requirements. During testing and integration, light shielding, interlocks, beam termination, and appropriate protective measures should be set up to avoid direct viewing or reflection into the eyes.
Planning to introduce the PLD905-40W-MCL into a ranging module? It is recommended to also confirm working pulse parameters, drive circuitry, thermal path, optical collimation solution, target surface spot indicators, and receiving link parameters.
Target measurement range, target size and reflectivity, required spot diameter, repetition rate, pulse width, type of receiving detector, operating temperature, and package pin version.
905 nm · FAC fast-axis collimation · Four emission layers · TO56 metal package
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