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ERDI LDR40K1 1064nm High-Energy Laser Target Designator – 40mJ Military Targeting System

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Product Model:LDR40K1

The LDR40K1 is a tactical-grade 1064 nm laser rangefinder and target designator delivering ≥ 40 mJ pulse energy, 1–20 Hz ranging, up to 10 km measuring distance and ≥ 4 km effective laser illumination. It combines ±1 m ranging accuracy, ≥ 98% hit rate, precise 1–20 Hz frequency coding with ±1 μs timing, and configurable short/long irradiation cycles in a compact 115 × 65 × 60 mm, ≤ 460 g module. Powered from 20–28 V with ≤ 55 W average consumption and controlled via an RS-422 digital interface, the LDR40K1 is optimized for UAV payloads, airborne targeting pods, ground vehicle turrets and other SWaP-sensitive electro-optical systems operating in harsh environments.

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Contact Us

Senior Engineer, Yilin

Tel : +86 28 81076698

WhatsApp : +86 18000520222

ERDI Pre-Sales Notice & Customer Information

(Please Read Before Purchase or Inquiry) Thank you for your interest in ERDI TECH LTD. We are committed to providing customers worldwide with high-precision, high-reliability laser products and technical solutions. Before placing an order, please read the following information carefully to better understand our company, services, and purchasing policies.

  • About ERDI​

     ERDI is a professional manufacturer specializing in the research, development, and production of laser modules, laser measurement systems, and related optoelectronic components.
    We integrate design, R&D, production, and sales, with a focus on safety, innovation, and precision.

    Our products are widely used in:

    • Industrial measurement and alignment systems
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    • Optical instrumentation and laser testing
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    ERDI operates certified facilities and maintains rigorous quality control to ensure that every product meets international standards.

  • Global Presence and Trade Reliability​

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    • Standard samplesare typically delivered within one week after order confirmation.
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    We provide technical co-development, logo engraving, packaging customization, and batch production services to meet both small-scale and mass-production requirements.

  • Technical Support and Service System​

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    We provide:

    • Comprehensive technical consultation and project evaluation
    • One-on-one on-site technical assistanceat the customer’s facility when required
    • Lifetime after-sales supportand technical maintenance guidance

    Each laser product is delivered with a full set of user documentation, including Laser Module Usage Precautions and Safety Guidelines.

  • Quality Assurance and Warranty​

    ERDI implements strict multi-stage quality control throughout production:

    • Incoming material inspection
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    Except for man-made damage, we will replace any defective unit within one year free of charge and provide lifetime maintenance support thereafter.

    For more details, please refer to our After-Sales Service & Warranty Policy.

  • Important Safety Reminder

    Before using any ERDI laser product:

    • Carefully read and follow the Laser Module Usage Precautions.
    • Always use appropriate laser protective eyewear.
    • Operate only in controlled environmentsunder trained personnel supervision.
      Failure to observe safety instructions may result in injury or equipment damage.
  • Communication and Order Confirmation​

    To ensure efficient service, please confirm the following before placing an order:

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  • Final Statement​

    ERDI upholds the values of safety, integrity, and precision. We sincerely welcome customers from all over the world to visit our facilities, discuss cooperation, and experience our advanced laser technologies firsthand. Your satisfaction and trust are our highest pursuit.

After-Sales Service & Warranty Policy

We strive to provide high-quality laser modules and excellent customer service. Please read the following terms carefully to understand your rights and our responsibilities.

  • Product Origin and Quality Assurance​

    • All ERDI products are manufactured directly by the factory, ensuring consistent quality and full traceability.
    • We provide a diverse rangeof laser modules and laser distance measurement modules to suit various industrial, educational, and research applications.
    • Every product is tested and inspectedbefore shipment to guarantee that it meets specification standards.
  • Return and Exchange Policy​

    • Customers may request a return or exchange within 30 daysof receiving the goods, provided that:
    • The product remains in original condition, unused, and without affecting secondary sales.
    • A valid reason for return or exchangeis provided.
    • Upon approval, we will replace or refund according to our service policy.
    • The buyer is responsible for shipping costsassociated with returns, exchanges, or repairs, based on international freight cost rules.
  • Warranty Coverage​

    • The main functional componentsof ERDI laser products are covered by a 2-year warranty from the date of purchase, excluding cosmetic appearance.
    • Within the first 12 months, if a verified manufacturing defect occurs, we will replace the item with a brand-new productfree of charge.
    • Replacement of cosmetic or housing components (e.g., enclosure, labeling, or exterior parts) may incur a reasonable cost feebased on material expenses.
    • Warranty does not cover:
    • Damage due to misuse, improper installation, or modification.
    • Operation outside the recommended power supply or temperature range.
    • Accidental or physical damage, including drops, fire, or liquid ingress.
  • Receiving Inspection​

    • Upon delivery, please inspect the parcel immediately in the presence of the courier.
    • If there is any quantity discrepancy, visible damage, or mismatch, do not signthe delivery receipt.
    • Once the package is signed for (by you, family, or colleagues), it is considered accepted as correct and complete.
  • Customer Support

    For technical assistance, warranty claims, or safety inquiries, please contact our official service team through the contact information listed on erdicn.com.
    Our support engineers will provide professional guidance on installation, alignment, safety, and maintenance procedures.

Laser Module Usage Precautions

(Important – Buyers Must Read Before Use)

Operating laser modules involves potential optical and thermal hazards. To ensure safe and proper use, please read the following precautions carefully before powering on your laser product.

  • General Safety Warnings​

    • Invisible Radiation Warning– Some laser modules emit infrared (IR) or ultraviolet (UV) radiation that is invisible to the human eye. Never assume the laser is malfunctioning simply because you cannot see the beam. Always confirm that the power is disconnected before inspecting the module.
    • Do Not Look Directly into the Laser Aperture– Even when wearing certified laser safety goggles, never stare directly into or near the beam exit of a working laser module.
    • Avoid Reflected Beams from High-Power Lasers– Reflection from Class IV lasers (output power > 500 mW) can cause severe and permanent eye damage. Always wear wavelength-specific safety goggles when operating or aligning high-power laser systems.
    • Keep Away from Flammable Materials– Do not place flammable or explosive items (such as paper, cloth, leather, or plastics) in the laser path. Black or dark-colored materials absorb laser energy more easily and may ignite. (Exception: controlled material-burning experiments with proper fire protection.)
    • Avoid Direct Human Exposure– Class IIIa or higher lasers (≥ 5 mW) can burn skin or eyes. Never point a laser beam at any part of a person’s body.
    • Restrict Access to Trained Personnel Only – Keep all laser devices out of reach of untrained individuals, children, and pets.
  • Optical Path and Reflection Safety​

    • Never Aim Toward Glass Surfaces– Ordinary glass reflects roughly 4 % of incident light, which can redirect dangerous laser radiation into your eyes. Avoid operating lasers in front of mirrors or reflective windows.
    • Working Plane Awareness– When setting up an experimental platform, note the laser emission height. Do not position your head or eyes near this level during operation. Lenses and mirrors may reflect or refract light unexpectedly. Always align optical components downward or horizontally—never angle a beam upward.
    • Remove Reflective Accessories– Watches, jewelry, and other shiny objects can reflect laser light unpredictably. Remove them before use.
    • Infrared Beam Detection– IR lasers (wavelength > 800 nm) are almost completely invisible. Use a beam-viewing card, IR detector, or up-conversion screen to visualize the beam path safely.
    • Visual Brightness Misjudgment– Some wavelengths (below 430 nm or above 700 nm) appear much dimmer than their actual power output. Do not rely on visual brightness to judge beam intensity.
    • Pulsed Laser Caution– Pulsed lasers can have extremely high peak power even at modest average power levels. Verify that all optical elements and samples in your experiment exceed the laser’s damage threshold before exposure.
    • Prohibited Uses– It is strictly forbidden to point laser beams at moving vehicles, aircraft, or any area where light could distract or endanger others.
    • End-of-Beam Safety Stop– Always place a black anodized or matte metal plate at the end of your optical path to absorb residual energy and prevent laser leakage into surrounding areas.

    Low-Power Modules – ERDI laser modules rated below 1 mW are considered eye-safe under normal operating conditions and can be used without hazard when handled properly.

  • Recommended Protective Measures​

    • Protective Eyewear– Always wear certified laser safety goggles designed for the specific wavelength and power level of your module.
    • Appropriate Clothing– Light-colored or white long-sleeved clothing reduces the risk of heat absorption or ignition if stray laser light contacts the fabric.
    • UV Laser Protection– For ultraviolet lasers, apply broad-spectrum sunscreen (SPF 30 or higher) to exposed skin areas to minimize UV radiation effects.
    • Environmental Safety– Operate lasers in a controlled laboratory or industrial environment with minimal reflective surfaces. Ensure that all personnel nearby are informed of ongoing laser use and have received proper training.

MAIN FUNCTIONS

The main functions of the LDR40K1 Laser Designator/Rangefinder are as follows:

  • Responds to laser designation commands and performs laser illumination using specified internal and external synchronization encoding modes.
  • If no stop command is received after illumination starts, the system automatically stops after completing one illumination cycle.
  • Supports laser code configuration.
  • Performs laser rangefinding.
  • If no stop command is received after initiating continuous ranging, the system automatically stops after 5 minutes (1 Hz)or 1 minute (5 Hz).
  • Provides multi-target indication capability.
  • Includes reverse polarity protection for the power supply.
  • Records and reports the total number of emitted laser pulses.

TECHNICAL SPECIFICATIONS

Parameter

Specification

Working Wavelength

1064 ± 3 nm

Pulse Average Energy

≥ 40 mJ

Energy Stability

Pulse energy variation ≤ 10% of the average within one illumination cycle

Pulse Width

15 ns ± 5 ns

Beam Divergence

≤ 0.4 mrad

Ranging Frequency

1 Hz / 5 Hz / Single shot

Ranging Accuracy

± 2 m (1 σ)

Minimum Range

≤ 100 m

Maximum Range

≥ 6000 m (at 10 km visibility, target reflectivity 0.2, target size 2.3 m × 4.6 m)

Continuous Ranging Duration

5 min (1 Hz) / 1 min (5 Hz)

Measurement Reliability

≥ 98%

Laser Encoding Accuracy

± 1 µs

Base Encoding Frequency

20 Hz

Continuous Illumination Duration

Short cycle: ≥ 18 s illumination, ≤ 10 s interval, continuous for 8 cycles
Long cycle: ≥ 47 s illumination, ≤ 30 s interval, continuous for 2 cycles
After completing one long and one short illumination, reactivation interval ≤ 30 min

Power Supply

DC 20 V – 28 V

Consumption

Average ≤ 50 W, Peak ≤ 100 W

Dimensions

≤ 115 mm × 65 mm × 60 mm

 Weight

≤ 460 g

Operating Temperature

–40°C to +60°C

Storage Temperature

–45°C to +70°C

APPLICATIOS

• Airborne electro-optical targeting pods
• UAV reconnaissance and laser designation payloads
• Ground-based fire-control and observation systems
• Laser-guided munition support and calibration platforms
• Defense and security laser rangefinding operations

OUTLINE DIMENSION

LDR40K1 laser rangefinder/designator measures

PIN INTERFACE

  • Communication interface: one RS-422 serial port.
  • External trigger interface: provision for an external coding trigger. The external trigger input accepts TTL-level signals, 3.3 V logic, rising-edge triggered. Minimum pulse width: >10 µs.
  • Connector: see figure below for pinout and connector type.40mJ Laser Target Designator Module

Connector interface definitions are shown in Table .

 

Table  – Electrical Interface Definitions

Pin No.

Signal Name

Description

1

422-GND

RS-422 ground

2

24V

Power supply +

3

24V

Power supply +

4

24V GND

Power supply −

5

24V GND

Power supply −

6

422_RX+

Host → Laser Rangefinder +

7

422_RX−

Host → Laser Rangefinder −

8

422_TX−

Laser Rangefinder → Host −

9

422_TX+

Laser Rangefinder → Host +

Product Description

LDR25K1 25 mJ 1064 nm Laser Rangefinder / Target Designator Module

The LDR25K1 1064nm laser target designator module integrates coded laser designation and laser ranging in a single compact unit to provide target illumination for terminally guided weapons and long-range EO/IR sights. With a 25 mJ pulse energy level and tight beam quality, it is well suited for UAV payloads, light vehicle turrets and portable designator systems where size, weight and power must be kept under control.

The module supports full control from a host computer: start and stop ranging, start and stop laser illumination, set range gate, select automatic or fixed receiver gain, configure coding mode, read distance and pulse count, and query system status. It can respond to external commands in real time and reports both range data and status bytes after each measurement or designation burst, simplifying health monitoring and system integration.

In ranging mode, the LDR25K1 operates at 1 Hz or 5 Hz, plus single-shot measurement. Continuous ranging can last for 5 minutes at 1 Hz or 1 minute at 5 Hz before a short rest is required. The minimum range is ≤ 120 m and the maximum range is ≥ 5,200 m on vehicle-size diffuse targets, with range accuracy of ±2 m and an acquisition rate of at least 98%. First-target or last-target logic can be selected to adapt to cluttered backgrounds or partially obscured scenes.

In designation mode, the module provides an effective laser illumination distance ≥ 2 km and uses precise frequency coding to match weapon-system requirements. The basic designation frequency is 20 Hz, coding accuracy is better than 2.5 μs, and eight pre-stored period codes are available; user-defined code expansion is also supported. Illumination time within one cycle is adjustable from 1 to 25 s, with up to eight continuous cycles and at least 30 s off-time between cycles to protect the laser head.

Mechanically, the LDR25K1 fits within an estimated 68 mm × 52 mm × 90 mm envelope and weighs no more than 380 g, which is ideal for stabilized gimbals, compact pods and handheld systems. Power is supplied from a 20–28 V DC bus, with an average operating power consumption of ≤ 50 W and peak power ≤ 100 W.

The electrical interface uses a single TTL-level serial port with a MOLEX 53048-0810 board connector and 51021-0800 mating plug. The pinout provides +24 V and return lines plus TTL_TX and TTL_RX for host communication. The asynchronous serial protocol follows RS-422/TTL conventions at 115200 bps, 8 data bits, 1 start bit, 1 stop bit and no parity, with least significant byte sent first. Commands select operating mode, ranging frequency, gain mode and coding mode, while status bytes report distance validity, ranging/designation state, external sync flag, temperature status and other diagnostics.

Environmentally, the LDR25K1 is designed for high-reliability operation in demanding conditions. The working temperature range is −40 °C to +60 °C and the storage range is −55 °C to +70 °C, matching typical airborne and ground-platform requirements. The housing is sealed and dust-proof; internal high-voltage areas are protected, and the front optical window must be kept clear during use to avoid damaging the photodetector. These characteristics, combined with ERDI’s experience in 1064 nm designator modules, make the LDR25K1 a strong choice for lightweight laser guidance and mid-range targeting applications.

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