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Description

793 nm, 135 W Fiber-Coupled Diode Laser Module – M793±3-135-F135/22-DK

The M793±3-135-F135/22-DK is a high-power, fiber-coupled diode laser module designed for demanding industrial, medical, and scientific applications that require reliable near-infrared emission around 793 nm. Delivering up to 135 W of optical output power directly from the exit fiber, this module offers a powerful and compact pumping and illumination solution for integration into advanced laser systems. Its high brightness, excellent thermal behavior, and stable spectral characteristics make it well suited for integration into OEM platforms where performance and uptime are critical.

Operating in the 790–796 nm wavelength range with a typical center wavelength of 793 nm and a narrow spectral width of 3 nm (FWHM), this diode laser module is optimized for use as a pump source for thulium- and holmium-doped fiber lasers and solid-state lasers, as well as for various near-IR applications such as materials processing, medical therapy systems, spectroscopy setups, and defense-related illumination. The narrow emission bandwidth improves pumping efficiency and system stability, while the specified wavelength temperature coefficient of 0.35 nm/°C allows precise wavelength tuning and stabilization through temperature control.

The module is fiber-coupled through a large-core, multimode fiber specifically tailored for high-power transmission. With a core diameter of 135 µm and a cladding diameter of 155 µm, the fiber supports efficient coupling of the diode output into downstream optical stages. A numerical aperture of 0.22 at the fiber and a specified NA of 0.18 for 95 % encircled energy at the exit ensure good beam delivery and compatibility with common collimation and focusing optics in pumping and illumination setups. The standard fiber length of 2 m provides installation flexibility in laser systems and optical benches, and an SMA905 connector configuration is available as an option for straightforward integration with existing optomechanical interfaces.

Electrically, the M793±3-135-F135/22-DK is engineered for efficient and stable high-power operation. With a threshold current in the 1.4–1.5 A range and a typical operating current around 9–10 A, the module achieves a slope efficiency of approximately 17.5 W/A. This leads to a power conversion efficiency of about 44 %, which is competitive with similar high-power 793 nm pump modules and reduces thermal load on the system. The typical operating voltage is 32.6–33.0 V, making the module compatible with standard high-current diode laser drivers used in industrial and scientific environments. This combination of high efficiency and robust electrical design supports long-term stable output power when integrated with appropriate driver electronics and thermal management.

For safe and reliable operation, the module incorporates a thermistor for accurate temperature monitoring. The thermistor has a resistance of 10 kΩ at 25 °C, enabling precise feedback control in conjunction with temperature controllers or TEC-based cooling systems. The recommended operating temperature range at the thermistor is 20–35 °C, which supports stable wavelength and power characteristics in typical laboratory and industrial environments. The module can be stored safely in the temperature range from –20 °C to +80 °C, which simplifies logistics and long-term stocking for OEM system manufacturers. Allowed operating humidity is below 75 %, aligning with standard cleanroom and manufacturing conditions.

An important aspect of the M793±3-135-F135/22-DK is its integrated back reflection isolation in the 1800–2100 nm wavelength range, providing more than 30 dB attenuation for that band. This is particularly relevant when the module is used as a pump source for mid-IR or 2 µm-class fiber and solid-state lasers, where back-reflected signal radiation can potentially couple back into the pump source. The integrated isolation helps protect the diode laser against destabilizing reflections and enhances overall system robustness, reducing the need for additional external optical isolators in many configurations.

The electrical interface provides clearly defined pins for the laser diode anode and cathode, photodiode anode and cathode, and thermistor connections. This layout facilitates straightforward integration into OEM driver electronics and control boards. The built-in photodiode enables power monitoring and feedback control functions that are typically required in precision pumping applications, where constant optical output or controlled ramp-up profiles are critical. Together with suitable driver and control electronics, the module can be operated with high stability in power- or current-regulated modes.

From a system design perspective, the M793±3-135-F135/22-DK aligns well with state-of-the-art high-power 793 nm fiber-coupled pump modules commonly deployed in f

793nm 135W Fiber-Coupled Diode Laser

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Specifications

Laser Type: Continuous Wave (CW), Modulated
Fiber Type: Multi-Mode
Wavelength: 793 nm
Output Power: 135000 mW
Fiber Core Diamater: 135 um
Fiber Cladding Diameter: 155 um
Model: M793±3-135-F135/22-DK
Output Power Range (exit Fiber): 130 – 135 W
Central Wavelength Range: 790 – 796 nm (typ. 793 nm)
Spectral Width (FWHM): 3.0 nm
NA With 95% Encircled Energy: 0.18
Wavelength Temperature Coefficient: 0.35 nm/°C
Fiber Core Diameter: 133.5 – 136.5 µm (typ. 135 µm)
Fiber Numerical Aperture: 0.22
Fiber Length: 2.0 m
Connector (optional): SMA905
Threshold Current: 1.4 – 1.5 A
Operating Current: 9.0 – 10.0 A
Operating Voltage: 32.6 – 33.0 V
Slope Efficiency: 17.5 W/A
Power Conversion Efficiency: 44 %
Back Reflection Isolation Wavelength Range: 1800 – 2100 nm
Back Reflection Isolation Attenuation: > 30 dB
Thermistor Resistance At 25°C: 10 kΩ
Operating (Thermistor) Temperature: 20 – 35 °C
Operating Humidity: < 75 %
Storage Temperature: -20 – +80 °C

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Features

  • High Output Power 135 W @ 793 nm – Delivers up to 135 W optical power at the fiber exit, ideal for demanding pumping and industrial applications requiring high brightness and stability.
  • Narrow Spectral Width (3 nm FWHM) – Typical 3.0 nm full-width at half-maximum (FWHM) spectrum provides excellent spectral control for pumping solid‑state and fiber lasers and for precision thermal and materials processing.
  • Optimized 793 nm Center Wavelength – Center wavelength of 793 nm (790–796 nm range) specifically suited for Tm- and Ho-doped fiber/solid-state laser pumping and other 790–800 nm applications.
  • High-Efficiency Fiber-Coupled Design – Power conversion efficiency of up to 44% reduces electrical power consumption and heat load, enabling compact and energy-efficient OEM system integration.
  • Large-Core, High-NA Fiber Output – 135 µm core diameter (typical) and 0.22 NA provide a robust, easy-to-align output beam that is well matched to many pump delivery fibers and coupling optics.
  • 95% Encircled Energy NA 0.18 – NA with 95% encircled energy of 0.18 ensures that the majority of power is confined to a well-defined numerical aperture, simplifying downstream collimation and focusing.
  • Standard 2 m Fiber Length with Optional SMA905 Connector – 2.0 m rugged fiber pigtail supports flexible routing in laser systems; optional SMA905 connector offers plug‑and‑play coupling to standard opto‑mechanical components.
  • High Slope Efficiency (17.5 W/A) – Efficient electrical-to-optical conversion minimizes driver current requirements and helps achieve high output power with moderate drive electronics.
  • Stable Wavelength vs. Temperature (0.35 nm/°C) – Well-characterized wavelength temperature coefficient of 0.35 nm/°C allows precise wavelength tuning and stabilization via TEC control in OEM designs.
  • Integrated Back-Reflection Isolation (1800–2100 nm) – Built-in isolation with >30 dB attenuation in the 1800–2100 nm band protects the diode from detrimental back reflections originating from Tm/Ho lasers and other IR sources.
  • Reliable Operating Current and Voltage Range – Typical operating current of 9–10 A and voltage of ~33 V support straightforward integration with standard high‑power laser diode drivers.
  • Integrated Thermistor for Temperature Monitoring – 10 kΩ thermistor at 25°C enables precise temperature sensing and closed‑loop control, improving wavelength stability and lifetime in long‑term operation.
  • OEM-Ready Fiber-Coupled Module – Designed specifically for system builders; compact fiber‑coupled form factor simplifies mechanical integration into medical, industrial, and scientific laser systems.
  • Defined Operating and Storage Ranges – Operating temperature (thermistor) 20–35°C, storage temperature −20 to +80°C, and <75% operating humidity support reliable performance in typical laboratory and industrial environments.
  • Designed for Compliance in OEM Systems – Supplied as an OEM fiber-coupled laser module; final IEC 60825-1 and FDA/CDRH laser safety compliance is facilitated by clear electrical, optical, and safety interface definitions for system integrators.

Applications

Applications of the 793±3 nm, 135 W Fiber‑Coupled Diode Laser Module (Model M793±3-135-F135/22-DK)

The high-power, 793 nm, fiber‑coupled diode laser with 135 W output and 135 µm / NA 0.22 delivery fiber is optimized for demanding OEM and system-integration tasks in industrial, medical, and scientific fields. Typical and emerging applications include:

1. Solid‑State and Fiber Laser Pumping
  • Pumping of thulium-doped fiber lasers (TDFL) for 1.9–2.1 µm emission in materials processing, medical surgery, and LIDAR.
  • Pumping of Ho-doped fiber and solid-state lasers for 2.0–2.1 µm high‑energy pulsed and CW sources.
  • Cladding‑pumped fiber laser architectures requiring high-brightness 793 nm pump modules with 135 µm core fibers.
  • Multi‑kilowatt fiber laser pump combiners where several 793 nm diode modules are wavelength- or power-combined.
  • High-efficiency DPSSL pumping for crystals with absorption bands near 790–795 nm.
2. Medical and Aesthetic Laser Systems (OEM Integration)
  • 2 µm surgical laser pumping (Tm/Ho systems) for precise cutting and ablation in ENT, urology, and pulmonology.
  • Endovenous laser therapy (EVLT/EVLA) via 1.9–2.1 µm fiber lasers pumped at 793 nm.
  • Dermatology and aesthetic platforms using Tm/Ho-based mid‑IR sources for fractional skin resurfacing and scar revision.
  • Laser lithotripsy sources where 793 nm diodes pump Tm or Ho lasers employed in kidney and ureter stone fragmentation.
  • Photothermal therapy research systems leveraging 2 µm lasers pumped by high‑power 793 nm modules.
3. Industrial Materials Processing (Through Pumped Fiber/Solid-State Lasers)
  • Precision cutting and micro‑machining with 2 µm fiber lasers pumped at 793 nm for polymers, plastics, and specialty materials.
  • Marking and surface structuring using Tm/Ho lasers for specialized materials where 1 µm or 1.06 µm are less effective.
  • Thin‑film and polymer processing where 2 µm absorption is advantageous (e.g., in transparent polymers or composites).
  • Selective laser sintering of polymers in R&D setups based on 2 µm sources pumped at 793 nm.
4. Sensing, LIDAR, and Environmental Monitoring
  • Pumping of 2 µm LIDAR transmitters used for eye‑safe ranging and 3D mapping.
  • Gas sensing systems where Tm/Ho lasers around 2 µm target absorption lines of H2O, CO2, CH4, and other species.
  • DIAL (Differential Absorption LIDAR) sources for atmospheric monitoring pumped by 793 nm diodes.
  • Industrial in‑line process monitoring using 2 µm spectroscopic probes excited via 793 nm‑pumped fiber lasers.
5. Scientific and R&D Applications
  • Nonlinear optics experiments where 793 nm pumping drives parametric processes in specialty fibers and crystals.
  • Development of new Tm/Ho-doped fibers and gain media, including characterization of efficiency and thermal behavior.
  • Laboratory prototypes of mid‑IR sources built around 2 µm lasers and OPOs pumped by 793 nm diode modules.
  • Laser cooling and trapping platforms (support lasers) in experimental setups requiring robust 793 nm pump sources.
  • Optical component and fiber reliability testing under high optical power at ~793 nm.
6. OEM Pump Engines and System Subassemblies
  • Integration into rack‑mount pump units for multi‑channel fiber laser systems.
  • Use in modular pump cassettes for scalable industrial or medical laser platforms.
  • Redundant or hot‑swappable pump modules for high‑uptime laser systems in production environments.
  • Custom pump combiners and beam delivery assemblies using 135 µm / NA 0.22 fibers and SMA905 connectors.
7. Defense, Security, and Aerospace (OEM Use)
  • Pumping of eye‑safe 2 µm rangefinder and target designator lasers for ground or airborne platforms.
  • Directed infrared countermeasure (DIRCM) source pumping in research and qualification setups.
  • Long‑range atmospheric propagation studies with 2 µm lasers driven by 793 nm pump diodes.
  • High‑reliability pump modules for ruggedized fiber laser sources in aerospace and defense applications (OEM integration).
8. High‑Power Fiber Delivery and Illumination (Indirect)
  • Broadband or tunable 2 µm illumination systems where the primary source is a Tm/Ho

Frequently Asked Questions

What is the PhotonTec Berlin M793±3-135-F135/22-DK laser module and what are its key specifications?
The PhotonTec Berlin M793±3-135-F135/22-DK is an OEM fiber‑coupled semiconductor diode laser module designed for integration into larger laser systems. It delivers 130–135 W of optical output power at a central wavelength of 793 nm (±3 nm) with a spectral width of 3 nm (FWHM). The output is coupled into a 135 µm core / 155 µm cladding multimode fiber with NA 0.22 and an NA of 0.18 for 95% encircled energy. Typical operating current is 9–10 A at about 33 V, with a slope efficiency of 17.5 W/A and a power conversion efficiency around 44%. The module includes an internal thermistor (10 kΩ at 25 °C) for temperature monitoring and offers optional SMA905 fiber connectorization.
What are typical applications for a 793 nm, 135 W fiber‑coupled diode laser like this one?
High‑power 793 nm fiber‑coupled diode lasers are widely used as pump sources for thulium‑ and holmium‑doped fiber lasers and solid‑state lasers (since 793 nm is a common pump wavelength for Tm: and Ho: media). Typical applications include medical and surgical lasers, materials processing, LIDAR, remote sensing, research laboratories, and pumping of eye‑safe 2 µm laser sources. The high brightness through a 135 µm, NA 0.22 fiber and the integrated back‑reflection isolation (1800–2100 nm, >30 dB) make this module especially suitable as a pump diode in 2 µm laser systems.
How should the M793±3-135-F135/22-DK diode laser be driven and thermally managed for reliable operation?
The module must be driven by a low‑ripple, constant‑current laser diode driver with appropriate safety features (current limiting, slow start, interlocks). The threshold current is about 1.4–1.5 A, and the typical operating current is 9–10 A; it should never be driven beyond the specified absolute maximum ratings provided by PhotonTec Berlin. Proper thermal management is critical: the module must be mounted on a suitable heatsink or temperature‑controlled baseplate, often combined with a thermoelectric cooler (TEC) in the host system. The integrated thermistor (10 kΩ at 25 °C) should be used in a temperature control loop to maintain the diode in the recommended operating temperature range of 20–35 °C. Keeping the temperature stable reduces wavelength drift (≈0.35 nm/°C) and improves lifetime and stability.
How does the back‑reflection isolation work and what protection does it provide?
This module integrates optical isolation for back reflections in the 1800–2100 nm wavelength range, with an attenuation greater than 30 dB. In practice, this means the module is designed to protect the 793 nm pump diode from harmful optical feedback originating from a 2 µm laser cavity or fiber being pumped. Back‑reflected light at the signal wavelength can destabilize the pump diode, cause power fluctuations, or even damage the chip. The internal isolator reduces feedback by a factor of at least 1000 (30 dB), significantly improving stability and reliability when the module is used as a pump source in 2 µm fiber or solid‑state laser systems. Nonetheless, good system‑level design (angled connectors, proper termination, and avoiding highly reflective interfaces) is still recommended.
What fiber parameters and connector options are available, and how should the output fiber be handled?
The standard output fiber for the M793±3-135-F135/22-DK has a 135 µm core diameter (typical, 133.5–136.5 µm tolerance), 155 µm cladding diameter, and numerical aperture of 0.22. The delivery fiber length is 2.0 m. An SMA905 connector is available as an option; otherwise, the fiber may be supplied with a bare end suitable for splicing or custom termination. When handling the fiber, it is essential to observe a bend radius significantly larger than the minimum recommended by the fiber manufacturer, avoid micro‑bending or crushing, keep the connector endface clean, and use appropriate fiber holders or cable management to prevent stress. Contaminated or damaged fiber facets can cause local heating, power loss, and premature failure at these power levels.
What environmental and storage conditions are recommended for this OEM laser diode module?
The specified operating thermistor temperature range is 20–35 °C, and operating humidity should be kept below 75% non‑condensing. For storage, the recommended temperature range is −20 to +80 °C. The module should be stored in a dry, clean environment, ideally in antistatic packaging to protect against electrostatic discharge (ESD). Before use, allow the module to reach thermal equilibrium with the ambient environment to avoid condensation. During operation, maintaining a stable temperature within the recommended range and avoiding rapid thermal cycling will enhance wavelength stability and diode lifetime.
Is the M793±3-135-F135/22-DK a certified laser product and what are the regulatory responsibilities of the integrator?
No. The M793±3-135-F135/22-DK is supplied strictly as an OEM fiber‑coupled semiconductor diode laser module, not as a complete, standalone laser product. It is not certified by PhotonTec Berlin as a finished laser device under IEC 60825‑1 or the FDA/CDRH regulations 21 CFR 1040.10 and 1040.11. When this module is integrated into a system, the equipment manufacturer (integrator) is responsible for: determining the correct laser class of the finished product; implementing all required safety features (key switch, interlocks, emission indicators, protective housings, emergency stop, etc.); ensuring correct labeling and user documentation; and performing any mandatory certifications, reporting, and compliance with national and international laser safety standards and regulations.

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