ER300 1535nm 300µJ Eye-Safe Erbium Glass Laser for Multi-Kilometer Rangefinders

Datasheet revision: Rev. A / 2026-10-27. Read the revision note (PDF) — corrected values and document-control status. To get the test record for a specific unit, request the test conditions.

PRODUCT OVERVIEW

ER300 is a compact 1535 nm pulsed laser source based on Er:Yb glass microchip technology, designed for multi-kilometer rangefinders.

Pulse energy

≥300 µJ

Repetition rate

1~10Hz

Pulse width

5 ns

Dimensions

25×8×6.8 mm³

Weight

8.5 g

KEY FEATURES

• ✔ 1535 nm Eye-Safe Operation (Class 1)
• ✔ 300µJ Pulse Energy
• ✔ Compact OEM Design
• ✔ High Pulse Stability
• ✔ Long Lifetime

Optical Specifications

Mechanical, Electrical and Environmental Specifications

Integration Considerations

Review package constraints, electrical requirements and thermal conditions before integration. The driver supply must be matched to the specified voltage and current, and the drive pulse width must remain within the stated limit. For application-specific questions, contact our engineering team with your system requirements.

APPLICATIONS

DOWNLOADS

• Datasheet (PDF)
• 3D model (GLB) — open in any 3D viewer or CAD tool
• Outline drawing (STEP) — request from our team
• Integration guide — request from our team

Product Description

ER300 1535nm 300µJ Eye-Safe Erbium Glass Microchip DPSS Laser

The ER300 is a 1.54µm, 1535nm eye-safe erbium glass microchip DPSS laser developed as a compact pulse source for long-range LiDAR, laser rangefinding and target designation tasks. It combines a diode-pumped Er³⁺:glass gain medium with a microchip resonator to deliver nanosecond pulses in a very small, board-level package that can be embedded in OEM systems where space and weight are tightly constrained.

The ER300 provides ≥300µJ single-pulse energy with a typical pulse width of 5ns and a repetition rate adjustable from 1 to 10Hz. Raw beam diameter is about 0.3mm and the divergence is ≤7mrad in a TEM₀₀ mode, which makes it straightforward to collimate or feed into a small-aperture transmit optic while maintaining good beam quality. Pulse stability is specified at 10%, supporting consistent performance for time-of-flight ranging and LiDAR point-cloud generation.

Designed for demanding outdoor environments, the laser operates from −40°C to +65°C and can be stored from −55°C to +75°C. It passes shock testing at 1500G / 0.5ms and vibration testing from 20–2000Hz at 20G, and the specified lifetime exceeds 1 million shots, giving system designers confidence in long-term field deployment. The module measures only 25×8×6.8mm³ and weighs about 8.5g, so it can be mounted directly on driver boards inside compact rangefinder or LiDAR modules.

Electrically, the ER300 is driven from a low-voltage, high-current pulse: typical load voltage is <2V, operating current is 12A, drive pulse width ≤2.4ms and repetition rate up to 10Hz. To protect the device, the driver must be correctly matched to these parameters; the specification sheet and factory test report are used as the reference for setting voltage, current, pulse width and PRF before enabling emission. Proper wiring practice is emphasized: power must be disconnected before connection, polarity must be carefully checked and all contacts should be secure to avoid short circuits, reverse polarity and intermittent connections.

Operating instructions also highlight the need to keep the laser output window clean. The window surface should not be touched; if contamination appears, it should be cleaned before use to prevent energy loss and potential damage. When integrated into a complete laser-ranging or LiDAR system, the ER300 acts as the transmitter core: its nanosecond pulse is expanded and collimated by the transmit optics, reflected from the target and detected at the receiver by an InGaAs APD matched to 1.5µm, with a TDC providing precise time-of-flight measurement.

Thanks to the 1.5µm wavelength, the ER300 works in an eye-safer regime and benefits from low atmospheric attenuation and strong penetration in haze, rain and aerosol conditions. Typical application scenarios include handheld and weapon-mounted laser rangefinders, micro and small UAV LiDAR payloads, EO/IR pods requiring an embedded 1535nm source, topographic mapping systems, industrial structural monitoring and robot navigation, as well as microjoule-to-millijoule-level hybrid architectures where ERDI’s erbium glass lasers are the core pulse engine.

OUTLINE DIMENSION

Figure 1 Outline Dimensions (mm)

Operating Instructions

• Match the laser driver to the ER200 laser.
  The laser driver power supply must be properly matched to the laser.
  The typical load voltage of the ER200 is < 2 V, with an operating current of 10 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.
  When 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.

Mounting, Interface and OEM / ODM

Mounting and thermal path. The outline drawing above gives the package envelope. Mounting features and the recommended thermal interface are confirmed against the drawing for your build; send the host-side footprint if you need a matched heatsink or bracket.

Trigger and electrical interface. The source is driven by an external driver. Trigger input, harness, connector and timing are defined with the driver and host system, within the drive-pulse width and repetition-rate limits in the table above. Share your interface requirements and we will confirm them for ER300.

OEM / ODM. Package, optical configuration and electrical interface can be reviewed for project-specific programmes, subject to technical feasibility. Scope and review process.

Request a Quote · Ask an Engineer · Request STEP / 2D drawing

Product FAQ

• Is this an eye-safe source?
  Class 1 eye-safe at the specified 1535 nm wavelength.
• What is the typical use?
  Rangefinding, LiDAR, sensing and OEM instrument integration.
• Can the package be customised?
  See OEM / ODM for the customisation scope and review process.

Where this model fits

The source is only one part of the choice. These pages cover how it is selected for the system it goes into, and what the documents contain:

• What "compact" means in this range
• Choosing a source for rangefinders
• Package dimensions and mounting
• Datasheets, drawings and interface documents