Detailed ER4000 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 |
ER4000 |
|
Laser Wavelength |
1535nm |
|
Eye safe |
Class 1 |
|
Pulse energy |
≥4 mJ |
|
Laser Pulse width |
12 ns |
|
Drive pulse width |
≤ 4 ms |
|
Pulse repetition rate |
1~5Hz |
|
Pulse stability |
10% |
|
Raw Beam Diameter |
0 .5 mm |
|
Beam divergence angle |
≤ 4mrad |
|
Beam Mode |
TEM00 |
|
Operating temperature |
-40 ℃ ~ +65 ℃ |
|
Storage temperature |
-55 ℃ ~+ 75℃ |
|
Dimension (mm) |
60×25×13.5mm3 |
|
Weight |
105 g |
|
Voltage |
≤ 5 V |
|
Electric current |
100 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 ER4000 laser.
The laser driver power supply must be properly matched to the laser.
The typical load voltage of the ER4000 is < 5 V, with an operating current of 100 A, pulse width < 4 ms, and a repetition rate of 5 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.
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
ER4000 1.54µm / 1535nm 4mJ Eye-Safe Erbium Glass Microchip DPSS Laser
The ER4000 is a 4mJ 1535nm eye-safe erbium glass microchip DPSS laser developed as a high-energy core for long-range LiDAR, precision laser rangefinders, infrared sensing and selected medical and communication systems. It uses an LD-pumped Er:glass gain medium in a compact resonator to generate nanosecond pulses at a Class 1 eye-safe wavelength, combining millijoule-level energy with a small, integration-friendly package.
The laser delivers ≥4mJ pulse energy with a typical pulse width of 12ns and a repetition rate adjustable from 1 to 10Hz. Pulse stability is about 10%. The raw beam diameter is ~0.5mm, the full-angle divergence is ≤4mrad and the mode is TEM₀₀, so users get a clean, well-collimated beam that is easy to expand for long-range LiDAR or to couple into compact transmit optics, scanners or fiber couplers.
Mechanically, the ER4000 fits into a 60×25×13.5mm³ housing and weighs about 105g, giving designers a 4mJ, 1535nm source that still fits inside pods, turrets and instrument bays where space is at a premium. Electrically, the typical load voltage is <5V with a high drive current of roughly 100A, drive pulse width ≤4ms and nominal repetition rate around 5Hz, adjustable in the 1–10Hz range. The driver must be properly matched to these parameters; otherwise the laser may fail to start correctly or may be overloaded and permanently damaged.
The ER4000 is built for harsh outdoor environments. It operates from −40°C to +65°C and can be stored between −55°C and +75°C. It withstands 1500G shock with 0.5ms duration and 20–2000Hz vibration at 20G, and the specified lifetime exceeds 1 million shots, which aligns with long-life LiDAR, rangefinding and sensor payload requirements.
Beyond classic laser rangefinders and LiDAR, 1535nm Er:glass sources are widely used in target recognition, laser radar, laser medical treatment and optical-fiber communication links, thanks to eye-safety and compatibility with telecom-grade components. The strong water absorption near 1.5µm also allows controlled energy deposition in water-rich tissues, enabling non-ablative skin treatments and other medical procedures, while the low atmospheric attenuation and good penetration in fog, rain and aerosol make the ER4000 suitable for meteorological LiDAR, obstacle-avoidance radar and environmental sensing.
Operation instructions focus on driver matching and safe wiring. Before any connection, the power supply must be completely switched off and isolated. During wiring, the positive and negative terminals must be checked carefully and all contacts must be firmly secured to avoid short circuits, reverse polarity or intermittent connections. After wiring, the driver parameters—voltage, current, pulse width and repetition rate—should be set according to the attached factory test report; once these are confirmed, the driver can be enabled and the ER4000 should operate normally.
Taken together, the 4mJ pulse energy, eye-safe wavelength, TEM₀₀ beam quality, compact size and MIL-grade environmental performance make the ER4000 a versatile 1535nm platform laser for long-range LiDAR channels, high-end rangefinders, advanced sensing nodes, medical devices and fiber or free-space optical links where both safety and performance matter.
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 ER4000 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.