Detailed ER400 Specifications
The technical material below is retained for this model only. Do not transfer a range, pulse, interface, mechanical or safety value from another 1535 nm product.
TECHNICAL SPECIFICATIONS
|
Model |
ER400 |
|
Laser Wavelength |
1535nm |
|
Eye safe |
Class 1 |
|
Pulse energy |
≥400 μJ |
|
Laser Pulse width |
6 ns |
|
Drive pulse width |
≤2.4 ms |
|
Pulse repetition rate |
1~10Hz |
|
Pulse stability |
10% |
|
Raw Beam Diameter |
0 .3 mm |
|
Beam divergence angle |
≤ 7 mrad |
|
Beam Mode |
TEM00 |
|
Operating temperature |
-40 ℃ ~ +65 ℃ |
|
Storage temperature |
-55 ℃ ~+ 75℃ |
|
Dimension (mm) |
35×8×6.8mm3 |
|
Weight |
12 g |
|
Voltage |
2 V |
|
Electric current |
15 A |
|
Shock |
1500 G, 0.5 ms |
|
Vibration |
20~2000 Hz/20 G |
|
Lifetime |
＞1million shots |
OUTLINE DIMENSION
Figure 1 Outline Dimensions (mm)
Model-specific conditions and limits
Conditions are retained only when the source states them. They are not reconstructed from a nominal range or wavelength.
Operating Instructions
-
Match the laser driver to the ER400 laser.
The laser driver power supply must be properly matched to the laser.
The typical load voltage of the ER400 is < 2 V, with an operating current of 15 A, pulse width < 2 ms, and a repetition rate of 10 Hz. For the exact operating parameters, please refer to the attached factory test report. The laser driver power supply must meet these requirements; otherwise, the laser may fail to operate properly or could be overloaded and permanently damaged. Therefore, before wiring, carefully check the laser specification sheet and confirm that the laser is compatible with the selected driver. -
Always disconnect power before wiring.
Before making any connections, make sure the power is switched off and completely isolated. During wiring, carefully check the positive and negative terminals of the laser and ensure correct polarity. After the wiring is completed, perform a thorough inspection to confirm that all connections are correct, in order to avoid short circuits, reverse polarity, and other faults. At the same time, make sure all terminals are firmly secured to prevent poor contact due to loose wiring. -
Set operating parameters according to the factory test report.
After confirming that the wiring is correct, set the corresponding parameters on the driver according to the attached factory test report. Once the parameters are correctly set, turn on the driver; the laser should then operate normally. -
Keep the laser output window clean.
Take care to keep the laser output window clean and do not touch the window surface. If contamination occurs, clean the window thoroughly before operating the laser. -
Use the correct mounting torque.
Because the overall length of the laser housing is relatively long, when fastening the laser via the mounting lugs on both sides, use a torque screwdriver set to 0.2 N·m. Excessive or insufficient torque may affect the mechanical stability and performance of the laser.
1535 nm Pulsed-Source Integration Context
Pulse energy, pulse width, repetition rate, beam divergence, drive waveform, thermal path and the receiving architecture must be assessed together in the finished instrument. The model PDF controls its source values; system range is not inferred from a pulse-energy value, a neighbouring model, or wavelength alone.
Pulse energy describes emitted energy per pulse; its effect cannot be separated from pulse width, divergence, optical losses, receiver threshold and the stated target/atmosphere conditions. It is not a substitute for a model-specific near- or long-range acceptance test.
Source-stated application context
Application labels indicate evaluation context, not automatic fitness for a finished system.
Product Description
ER400 1.54µm / 1535nm 400µJ Eye-Safe Erbium Glass Microchip DPSS Laser
The ER400 is a high-energy 1535nm eye-safe erbium glass microchip DPSS laser designed as the transmitter core for long-range LiDAR, laser rangefinders and target designation modules. It uses an LD-pumped erbium-doped glass gain medium in a compact microchip cavity to generate nanosecond pulses at 1.54µm, combining high single-pulse energy with a very small mechanical envelope.
The device delivers ≥400µJ pulse energy with a typical pulse width of about 6ns and a repetition rate adjustable from 1 to 10Hz. Beam quality is TEM₀₀ with a raw beam diameter around 0.3mm and divergence ≤7mrad, providing a tight, clean beam that is easy to collimate for long-distance propagation. Pulse stability is specified at 10%, which supports consistent echo levels for time-of-flight ranging and LiDAR point cloud acquisition.
Mechanically, the ER400 fits into a 35×8×6.8mm³ housing and weighs roughly 12g, making it suitable for direct mounting on driver PCBs inside compact rangefinder and LiDAR engines. Electrically, the typical load voltage is <2V with a high drive current (up to tens of amps), drive pulse width ≤2ms and PRF up to 10Hz. The driver supply must be matched carefully to these parameters; otherwise the laser may fail to operate correctly or suffer overload damage.
The ER400 is built for harsh environments. It operates from −40°C to +65°C and can be stored between −55°C and +75°C. Shock resistance is rated at 1500G / 0.5ms and vibration capability at 20–2000Hz / 20G, while lifetime is specified at more than one million shots, meeting the requirements of long-term fielded systems.
Operational guidelines emphasize safe wiring and parameter control: power must be disconnected before wiring; polarity and connections should be checked carefully to avoid short circuits or reversed terminals; operating parameters such as voltage, current, pulse width and repetition rate must be set according to the factory test report before enabling emission. The output window should be kept clean and should not be touched; if contamination occurs, it must be cleaned before use to prevent loss of energy and potential optical damage. Proper mounting torque (around 0.2 N·m on both mounting lugs) is recommended to maintain mechanical stability without stressing the housing.
With its 1.5µm wavelength, the ER400 operates in an eye-safer regime where radiation is strongly absorbed by the cornea and lens rather than the retina, reducing the risk of permanent eye injury and making it suitable for open, man-in-the-loop environments. Typical applications include long-range laser rangefinders, airborne and UAV-borne LiDAR payloads, naval and vehicle-mounted EO/IR systems, and industrial or infrastructure monitoring where multi-kilometer distance and high peak power are required.
Confirm short- and long-distance acceptance conditions
- Define minimum distance, target material, reflectance, size and incidence angle.
- Check receiver recovery, optical-axis overlap and strong-return handling at the intended near limit.
- Verify supply tolerance, peak current, grounding, interface levels, connector and timing with the ordered revision.
- For long-distance acceptance, state target geometry, visibility, weather, background and required detection probability.
- Test with the installed window, boresight, field of view, enclosure and thermal path rather than a bare module alone.
- Evaluate accessible emission, labels and failure conditions again for the finished laser product under IEC 60825-1.
Questions to resolve before design release
Does a stated maximum range apply to every target?
No. A stated range must be read with its target and environmental conditions. Dark, small, oblique, wet or partially obscured targets and degraded visibility can reduce received signal.
Does 1535 nm itself establish the laser classification?
No. Classification concerns accessible emission from the finished laser product. The module statement and final instrument assessment are distinct.
Can a long-range claim be used as the minimum range?
No. Minimum-distance behaviour depends on the particular transmit/receive geometry, receiver timing and strong-return management documented for the model and host system.
Product evidence and general technical context
The model PDF controls model claims. Public references below explain general engineering principles only.
- ERDI ER400 model PDFModel-specific technical evidence.
- System Design of a Pulsed Laser RangefinderOptical Engineering 30(3), 1991 - link budget, background, noise, detection and range error.
- The Short-Range, High-Accuracy Compact Pulsed Laser Ranging SystemSensors 22(6), 2146, 2022 - pulsed-ToF equation, timing error, reflectivity and temperature effects.
- Laser system range calculations and the Lambert W functionApplied Optics 48(4), B1-B7, 2009 - range performance versus atmospheric transmission, target and system parameters, and threshold SNR; its 1.06 µm example is general context, not ERDI model data.
- Monostatic all-fiber rangefinder systemApplied Optics 54(25), 7687-7694, 2015 - a measured case study of shared-aperture geometry and receiver-recovery loss; it does not establish an ERDI model limit.
- Light Transmission in Fog: The Influence of Wavelength on the Extinction CoefficientApplied Sciences 9(14), 2843, 2019 - measured and modeled wavelength-dependent fog attenuation.
- IEC 60825-1:2014Laser-product classification and accessible-emission requirements; final equipment requires system-level assessment.
- Practical application of pulsed “eye-safe” microchip laser to laser rangefindersOpto-Electronics Review 21(3), 2013 - a peer-reviewed 1535 nm rangefinder implementation; use for general transmitter/receiver and atmospheric-design context, not model specifications.