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Home/ Products/ Light Sources/ Coherent Sources/ Single frequency laser/ Clarity NLL 1550 nm Narrow‑Linewidth Laser Module, 35 mW, Linewidth 5 kHz/ 1550nm 35mW Clarity NLL Narrow Linewidth Laser Module

    • 1550nm 35mW Clarity NLL Narrow Linewidth Laser Module

    The Clarity NLL is a compact, low‑cost laser module that delivers high power and extremely narrow linewidth. The laser uses an ultra‑stable gas absorption line in a feedback configuration to narrow the laser linewidth, specified at < 5 kHz and typically 1–2 kHz. This linewidth is useful for any long‑baseline interferometric sensing application, such as distributed acoustic sensing (DAS), coherent lidar, or other similar applications. To support these applications, the module can also be configured to provide linear high‑speed frequency modulation capability of ±70 MHz with a 1 MHz bandwidth. The use of standard telecom lasers and our own gas cells provides a reliable and low‑cost product to meet the needs of these applications.

    Product features：Narrow linewidth: < 5 kHz, typically 1–2 kHz；High power: standard 40 mW；High stability: stabilised to a NIST‑traceable molecular reference；Fast frequency modulation: ±70 MHz DC to 1 MHz；Compact module or board‑level product；Custom digital I/O communication and command sets available

    Part Number：MP-NL-1550-35-5k-FA-M

    Application area：Distributed acoustic sensing (DAS) | Coherent lidar | Test and measurement | Interferometric sensing

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    Main parameters
  • Core parameters

  • Output Power Center Wavelength Linewidth

    35 mW (15 dBm) 1550 ± 3 nm 5 kHz

  • Dimension Drawing
    • General Parameters

    General Specifications

     

    Specification

    Performance

    Remarks

    Wavelength

    1550 ± 3 nm

    Consult factory for availability

    Output power

    35 mW (15 dBm)

    Typical

    Wavelength accuracy

    ±0.2 ppm

    NIST‑traceable

    Laser linewidth

    5 MHz

    1–2 kHz (typical)

    External frequency modulation

    ±70 MHz

    Nominal ±5 V input, DC to 1 MHz

    Side‑mode suppression ratio

    –35 dB

    –

    Optical isolation

    60 dB

    –

    Relative intensity noise

    –135 dB

    –

    Fiber type

    PM Panda

    –

    Fiber connector

    FC/APC

    –

    Polarization axis

    Slow axis

    –

    External interface

    USB

    Onboard RS232 header available

    Dimensions

    112 × 168 × 48

    mm

    Power supply

    +12 V at 1 A max.

    –

    Temperature range (operating)

    –10 to +50 °C

    –

    Temperature range (storage)

    –40 to +80 °C

    –

    *Note: 1.80 mW available on request

    .2.Measured by delayed self‑heterodyne method with 35 km delay.

    3.Larger tuning range available – determined by the gas absorption width; may affect laser linewidth.


    Characteristic Curve

    The spectrum analyser plot shows the laser self‑heterodyne signal using a 35 km delay. Assuming a Lorentzian line shape, the laser linewidth is one‑tenth of the single‑side –20 dB linewidth, or approximately 1 kHz, as shown in the figure. Coherence is still visible after 35 km, as indicated by the ripples in Figure 2.

     

     


    Optional Configurations

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  • Product title: 1550nm 35mW Clarity NLL Narrow Linewidth Laser Module
  • Product link: https://www.idealphotonics.com/product/detail/1811.html

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