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Description

Fiber Laser Mirror Gratings / Fiber Bragg Gratings for Laser

Fiber Laser Mirror Gratings, also known as Fiber Bragg Gratings (FBGs) for lasers, are advanced optical components designed to provide precise wavelength reflection and transmission within fiber laser systems. These gratings are inscribed directly into the core of optical fibers, creating a periodic variation in the refractive index that acts as a wavelength-selective mirror. This unique structure enables the FBG to reflect specific wavelengths while allowing others to pass through, making them essential for creating stable and efficient laser cavities.

In fiber laser applications, FBGs serve as both high reflectors (HR) and output couplers (OC), forming the fundamental mirrors of the laser cavity. The high reflector ensures maximum feedback at the desired lasing wavelength, while the output coupler allows controlled emission of the laser beam. By precisely selecting the reflection wavelength, these gratings enable single-wavelength operation and enhance the spectral purity of the laser output. The use of rare earth-doped optical fibers in conjunction with FBGs further amplifies the laser gain, supporting high-power and high-efficiency laser performance.

Fiber Bragg Gratings are widely recognized for their reliability, stability, and compatibility with various fiber types, including double-clad fibers and polarization-maintaining (PM) fibers. Their robust design allows for high power handling, making them suitable for demanding industrial, medical, and research laser systems. Additionally, FBGs are valued for their ultra-precise wavelength matching and broad reflectivity range, which are critical for applications such as fiber lasers, pump lockers, and advanced optical sensing.

The versatility of Fiber Laser Mirror Gratings extends to their adaptability across a wide range of wavelengths, from the near-infrared to the mid-infrared spectrum. Their compact, all-fiber construction ensures low insertion loss and high reliability, even in harsh operating environments. As a result, Fiber Bragg Gratings have become the preferred choice for engineers and system integrators seeking to optimize the performance and stability of modern fiber laser systems.

Fiber Bragg Gratings For Lasers

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Specifications

Center Wavelength Range: 1018 – 2040 nm
FBG Length: Not Specified
Reflectivity: 30 - 99%
Center Wavelength (nm): 1018nm, 1053nm, 1064nm, 1080nm, 1550nm, 1950nm, 2020nm, 2040nm
Wavelength Accuracy: 0.2nm
Reflectivity (HR): ≥99%
Reflectivity (OC): 3%~20%
Bandwidth (HR): 1~3nm
Bandwidth (OC): 0.2~1nm
SLSR: ≥15dB
Recoating/Package: Polyimide/60x12x6mm (High power: >50W)
Fiber Type: 10/125 DCF, 15/130 DCF, 20/125 DCF, 25/250 DCF, 30/250 DCF, 20/400 DC Fiber, PM or non-PM types
Power Handling (core): 20W, 50W, 100W
Fiber Termination: No connector
Pigtail Length At Both Sides: >0.8 meter (Typical)
Operating Temperature: -40 to +100°C
Storage Temperature: -40 to +100°C

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Features

  • Wide Bandwidth & Reflectivity Range: Supports a broad range of center wavelengths (1018nm, 1053nm, 1064nm, 1080nm, 1550nm, 1950nm, 2020nm, 2040nm) and reflectivity options (≥99% for HR, 3%~20% for OC), making it suitable for various laser applications.
  • Ultra-Precise Wavelength Matching: Offers wavelength accuracy of 0.2nm, ensuring stable and reliable laser performance.
  • High Power Handling Capability: Designed for high power fiber lasers, with power handling options up to 100W (core), and robust polyimide recoating or 60x12x6mm packaging for >50W applications.
  • Compatible with Multiple Fiber Types: Available for 10/125 DCF, 15/130 DCF, 20/125 DCF, 25/250 DCF, 30/250 DCF, 20/400 DC fiber, and both PM (polarization-maintaining) and non-PM fibers.
  • Excellent Side Lobe Suppression Ratio (SLSR): SLSR ≥15dB for superior signal quality and reduced noise.
  • Flexible Bandwidth Options: HR bandwidth: 1~3nm, OC bandwidth: 0.2~1nm, suitable for various laser cavity designs.
  • Long Pigtail Lengths: Standard pigtail length >0.8 meters on both sides for easy integration.
  • Wide Operating & Storage Temperature Range: Reliable performance from -40°C to +100°C, ideal for demanding environments.
  • No Connector Termination: Supplied with bare fiber ends for maximum customization and low insertion loss.
  • Customizable Specifications: Tailored solutions available for wavelength, power handling, fiber type, reflectivity, and bandwidth to meet specific application requirements.
  • Typical Applications: Perfect for fiber lasers, pump lockers, and advanced optical sensing systems.

Applications

  • Fiber Lasers: Used as high reflectors (HR) and output couplers (OC) to form stable laser cavities with precise wavelength selection, enabling efficient and reliable fiber laser operation.
  • Pump Laser Stabilization (Pump Lockers): Employed to stabilize the wavelength of pump lasers in fiber laser systems, ensuring consistent performance and preventing wavelength drift.
  • Optical Sensing: Utilized in fiber optic sensors for strain, temperature, and pressure measurements due to their wavelength-specific reflection properties and high sensitivity.
  • Telecommunications: Applied in dense wavelength division multiplexing (DWDM) systems for channel selection, filtering, and wavelength stabilization in optical communication networks.
  • Medical Lasers: Integrated into medical laser systems for precise wavelength control, enhancing the safety and effectiveness of surgical and therapeutic procedures.
  • Industrial Material Processing: Used in high-power fiber lasers for cutting, welding, marking, and engraving applications, benefiting from their high power handling and wavelength stability.
  • Laser Spectroscopy: Supports high-resolution spectroscopy by providing narrowband reflection and stable wavelength references.
  • Optical Coherence Tomography (OCT): Enhances imaging systems by acting as wavelength-selective mirrors, improving resolution and signal quality.
  • Laser Cavity Mirrors: Serves as distributed Bragg reflectors in various laser cavities, including rare-earth-doped fiber lasers (e.g., Yb, Er, Tm, Ho), for efficient feedback and output coupling.
  • Wavelength Reference and Calibration: Provides stable and precise wavelength references for calibration of optical instruments and systems.
  • Environmental and Structural Monitoring: Deployed in distributed sensing networks for real-time monitoring of infrastructure, bridges, pipelines, and other critical assets.
  • Research and Development: Widely used in laboratories for experimental setups requiring precise wavelength control and high reflectivity in fiber-based systems.

Frequently Asked Questions

What are Fiber Laser Mirror Gratings (Fiber Bragg Gratings) and how do they work?
Fiber Laser Mirror Gratings, also known as Fiber Bragg Gratings (FBGs), are optical components written into the core of an optical fiber. They act as wavelength-specific mirrors by reflecting particular wavelengths of light while transmitting others. This is achieved through a periodic variation in the fiber's core refractive index, creating a dielectric mirror effect. In fiber lasers, FBGs are used as high reflectors (HR) and output couplers (OC) to form stable laser cavities with precisely selected lasing wavelengths.
What are the main applications of Fiber Bragg Gratings for lasers?
Fiber Bragg Gratings for lasers are primarily used in fiber lasers as cavity mirrors (high reflector and output coupler), pump lockers, and optical sensors. Their ability to reflect specific wavelengths with high precision makes them ideal for wavelength stabilization, laser cavity formation, and sensing applications in telecommunications, industrial laser systems, and scientific research.
What wavelength ranges and reflectivity options are available for these Fiber Laser Mirror Gratings?
These Fiber Laser Mirror Gratings are available for center wavelengths including 1018 nm, 1053 nm, 1064 nm, 1080 nm, 1550 nm, 1950 nm, 2020 nm, and 2040 nm, with custom wavelengths also available. Reflectivity options include high reflectors (HR) with ≥99% reflectivity and output couplers (OC) with 3% to 20% reflectivity, allowing for flexible laser cavity design.
What fiber types and power handling capabilities do these FBGs support?
The Fiber Bragg Gratings support a wide variety of fiber types, including 10/125 DCF, 15/130 DCF, 20/125 DCF, 25/250 DCF, 30/250 DCF, 20/400 DC fiber, and both polarization-maintaining (PM) and non-PM fibers. They are designed for high power handling, with options for 20W, 50W, and 100W in the fiber core, making them suitable for high-power laser applications.
What are the key features and advantages of DK Photonics Fiber Laser Mirror Gratings?
Key features include wide bandwidth and reflectivity range, ultra-precise wavelength matching, high power handling, and compatibility with a wide variety of fiber types. These gratings offer robust performance in demanding environments, with operating and storage temperatures from -40°C to +100°C, and are available with polyimide recoating or packaged formats for high-power applications.
How do I specify and order a Fiber Bragg Grating for my laser application?
To order a Fiber Bragg Grating, specify the required center wavelength, power handling capability, fiber type, reflectivity (HR or OC), bandwidth, and bare fiber length. DK Photonics provides a part number format (FBGL------) to customize your order. For special requirements or custom wavelengths, contact the manufacturer directly for assistance.

Got more questions? Use the inquiry form to ask the supplier directly.

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