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Single Frequency Fiber Seed Lasers

Single frequency fiber seed lasers with sub-kHz to Hz-level linewidth, ultra-low phase noise, and PM or non-PM output, covering 1.0 µm to 2.0 µm.

  • Fiber Laser

    1.0 μm Frequency-Stabilized Laser Seed Source

    The 1.0 μm frequency-stabilized single-frequency fiber laser is designed for high-end applications such as precision interferometric imaging, ultra-long baseline measurement, and fiber sensing networks. It adopts narrow-linewidth single-frequency laser technology combined with a high-precision frequency stabilization control scheme, achieving extremely low frequency drift, excellent long-term coherence, and outstanding wavelength repeatability. It can significantly improve system signal-to-noise ratio and measurement resolution, suppress phase noise accumulation, and ensure stable output even during long-term operation and under harsh environmental conditions.

    Product Features

    • 50 to 100 mW CW, 10 kHz linewidth, frequency drift below 1 MHz per hour at 1064nm
    • PM980 or HI-1060 fiber output, PER 20 dB, FC/APC, 600 pm wavelength tuning range
    • RIN below -120 dB/Hz at 1 MHz, SNR above 60 dB, M² below 1.2
    • Intelligent frequency stabilization system, -10 to 45°C operating range, 12 VDC, 20W

    Typical Applications

    • Precision interferometric imaging requiring long-term frequency stability at 1064 nm
    • Ultra-long baseline interferometry and VLBI systems needing coherent 1064nm reference source
    • Fiber sensing networks where laser frequency drift introduces systematic measurement errors
    • Master oscillator seeding for high-power 1064nm MOPA chains requiring frequency-stabilized input
  • Frequency Fiber Laser

    1.0 μm High-Reliability Single-Frequency Seed Laser

    A centimeter-scale DBR resonator built on highly doped specialty fiber. That is what makes mode-hop-free operation possible at this wavelength.

    Seed Laser Pro’s 1.0 µm High-Reliability Single-Frequency Seed Laser delivers 100 mW of CW output at 1083.2 nm with sub-50 kHz linewidth and no mode hopping across the operating range. PM980 output with PER above 23 dB, optical SNR above 50 dB. Special temperature-control protection and shock-resistant resonator construction hold performance across -20 to 50°C. Built for gravitational wave detection research, fiber sensing, LiDAR, and coherent communication where reliability under real operating conditions cannot be compromised.

    Product Features

    • Sub-50 kHz linewidth at 1083.2 nm, mode-hop-free, no burst noise, high SMSR
    • 100 mW CW output, PM980 fiber, PER above 23 dB, SNR above 50 dB
    • Shock-resistant, temperature-controlled DBR resonator, -20 to 50°C operating range
    • Wavelength thermal tuning 0.2 nm, power stability P-P below 0.5%, 5 VDC

    Typical Applications

    • Gravitational wave detection research requiring stable, mode-hop-free 1083nm seed sources
    • Fiber sensing systems deployed in field and industrial environments requiring vibration resistance
    • Coherent LiDAR systems at 1083 nm benefiting from low RIN and high side-mode suppression
    • Coherent optical communication research using single-frequency 1083nm reference sources
  • Frequency Fiber Laser

    1.0 μm Industrial Single-Frequency Seed Laser (1064 nm)

    The 1064nm single frequency seed laser is the most widely used master oscillator wavelength in fiber laser systems. Nearly every high-power Ytterbium MOPA, coherent LiDAR transmitter, and 532 nm frequency-doubled green laser system starts here.

    Seed Laser’s PRo 1.0 µm Industrial Single-Frequency Seed Laser is built on highly doped specialty fiber in a centimeter-scale resonator. That compact cavity design produces sub-30 kHz linewidth, single longitudinal mode output with no mode hopping, no burst noise, and RIN below -130 dBc/Hz at 5 MHz. Temperature-control protection and vibration-resistant construction are integrated into the resonator itself, keeping performance stable across operating temperatures from -10 to 45°C and under real industrial vibration and shock conditions. PM980 fiber output, 50 mW, FC/APC connector standard.

    PRODUCT FEATURES 

    • Sub-30 kHz Linewidth, Mode-Hop-Free: Centimeter-scale specialty fiber cavity with kilohertz-level linewidth and no mode hopping across the wavelength tuning range. Mode-hop-free operation means no sudden frequency jumps during tuning or thermal variation:  essential for coherent sensing and MOPA seeding applications where a mode hop would disrupt the downstream system.
    • No Burst Noise, High SMSR:  Burst noise, the occasional large intensity spike found in some single-frequency lasers during mode competition, is eliminated by the compact resonator design. Side-mode suppression ratio above 60 dB confirms clean single-mode operation with no competing longitudinal modes.
    • Low RIN, Excellent Vibration Resistance: RIN below -130 dBc/Hz at 5 MHz. Special temperature-control and vibration-resistant resonator construction allows stable operation in environments where standard lab-grade seed lasers would lose lock or produce unstable output.

    TYPICAL APPLICATIONS

    • Coherent LiDAR and Laser Radar:  1064 nm is one of the two standard wavelengths for coherent LiDAR systems alongside 1550 nm. It offers stronger Rayleigh backscatter in fiber and better receiver sensitivity in some detection architectures. This seed laser’s mode-hop-free operation, sub-30 kHz linewidth, and low RIN meet the coherence and noise requirements of coherent Doppler LiDAR and range-finding systems.
    • Fiber Optic Sensing: Distributed acoustic sensing (DAS), Brillouin sensing, and fiber interferometry systems at 1 µm require a seed source with stable frequency, low intensity noise, and vibration-resistant construction for field deployment. The industrial-grade design of this seed laser makes it suitable for both laboratory sensor development and deployed field instruments.
    • Gravitational Wave Detection: Research-scale interferometric experiments and prototype gravitational wave detection setups use 1064 nm seed lasers as the master oscillator. Sub-30 kHz linewidth with mode-hop-free operation and low burst noise keep the interferometric baseline stable throughout long measurement runs.
    • Coherent Communication:  Single-frequency 1064 nm sources are used in coherent optical communication research, short-range free-space optical links, and as local oscillator references in coherent detection experiments. Low RIN and high SMSR are the primary requirements in these applications.
  • Linewidth Single-Frequency Fiber Laser

    1.0 μm Phase-Modulated Fiber Seed Source

    This seed laser does the opposite of every other product in Seed Laser Pro’s narrow-linewidth range and that is exactly its purpose.

    Seed Laser Pro’s 1.0 µm Phase-Modulated Fiber Seed Source uses RF-driven phase modulation to broaden output linewidth up to 100 GHz across the 980 to 1120 nm tuning range. Output power is 20 mW with PM980 fiber output, M² below 1.05, and PER above 20 dB. The spectral width is set by controlling RF signal power, giving precise SBS threshold control for any downstream high-power MOPA amplifier configuration. Built for high-power narrow-linewidth laser seeding, spectral synthesis, and coherent beam combining where maximizing amplifier output power is the primary engineering constraint.

    PRODUCT FEATURES

    • RF-controlled phase modulation, spectral width adjustable up to 100 GHz at 980-1120nm
    • 20 mW CW output, single longitudinal mode, M² below 1.05, OSNR 50 dB
    • PM980 fiber output, PER above 20 dB, power stability RMS below 0.2%
    • Wavelength tuning across full 980-1120nm range, -10 to 45°C operating range, 24 VDC

    TYPICAL APPLICATIONS

    • High-power narrow-linewidth laser seeding requiring tunable SBS threshold for kilowatt-class MOPA
    • Spectral synthesis applications combining multiple wavelength channels with controlled linewidth
    • Coherent beam combining architectures requiring matched, adjustable spectral width across array elements
    • High-power 532nm frequency doubling systems requiring SBS-managed 1064nm pump input
  • Frequency Fiber Laser

    1.0 μm Point Light Source

    The 1.0 μm point light source is a single-mode continuous-output fiber laser. It features a Fabry–Perot cavity design and employs single-clad fiber pumping technology to achieve high-performance laser output, with an output power of up to 200 mW. It also offers nearly diffraction-limited beam quality and can be widely used in scientific research, experimental teaching, and device testing and measurement.

    Product Features

    High Beam Quality
    Stable Power
    Polarization-Maintaining Single-Mode Output

    Typical Applications

    Scientific Research
    Experimental Teaching
    Device Testing and Measurement

  • Fiber Laser

    1.0 μm Ultra-Low Noise Seed Source

    Power stability below 0.5% peak-to-peak. RIN engineered specifically to stay low. This seed laser exists for one reason: to remove the laser as a noise source in measurements where noise is the thing being measured against.

    Seed Laser Pro’s 1.0 µm Ultra-Low Noise Seed Source delivers 10 to 50 mW of CW output at 980 to 1120 nm with 10 kHz linewidth, optical SNR above 50 dB, and PM980 or HI-1060 fiber output. Advanced low-RIN laser technology combined with a highly stable power control architecture suppresses intensity fluctuations to give downstream systems a clean optical reference. Built for new energy laser driving, coherent photoradar, precision interferometry, quantum optics, quantum communication, distributed fiber sensing, and coherent optical measurement.

    Product Features

    • 10 to 50 mW CW output, 10 kHz linewidth, single longitudinal mode at 980-1120nm
    • Advanced low-RIN technology, highly stable power control, P-P stability below 0.5%
    • PM980 or HI-1060 fiber output, PER 20 dB, SNR above 50 dB, power adjustable 10-100%
    • 5 VDC, 15W power consumption, -10 to 45°C operating range, compact 175x140x25mm module

    Typical Applications

    • Quantum communication and quantum optics requiring low-RIN local oscillator references
    • Distributed fiber sensing where laser intensity noise sets the achievable detection sensitivity
    • Coherent optical measurement and precision interferometry requiring stable, low-noise illumination
    • Coherent photoradar and new energy laser driving applications needing dependable noise performance
  • Fiber Laser

    1.0 μm Ultra-Narrow Linewidth Single-Frequency Seed Source

    -140 dB/Hz peak RIN and power instability of just 0.02% over an hour. These two numbers put this seed laser in a different stability class than a standard low-noise source.

    Seed Laser Pro’s 1.0 µm Ultra-Narrow Linewidth Single-Frequency Seed Source delivers 10 to 50 mW of CW output at 980 to 1120 nm with 10 kHz linewidth, RIN below -140 dB/Hz at peak, and power instability of only 0.02% peak-to-peak over one hour. High-precision frequency stabilization technology and an intelligent control system maintain this stability continuously, with 600 pm of wavelength tuning range built in. PM980 or HI-1060 fiber output, PER 20 dB, M² below 1.2. Built for new energy laser driving, coherent LiDAR, precision interferometric measurement, and quantum optics where both intensity stability and frequency control matter together.

    Product Features

    • RIN below -140 dB/Hz at peak, power instability 0.02% P-P over 1 hour, 10 kHz linewidth
    • High-precision frequency stabilization technology with intelligent control system
    • 600 pm wavelength tuning range, 10 to 50 mW output, PER 20 dB, M² below 1.2
    • PM980 or HI-1060 output, 5 VDC, 13W power consumption, -10 to 45°C operating range

    Typical Applications

    • New energy laser driving systems requiring stable, frequency-controlled 1064nm illumination
    • Coherent LiDAR transmitters needing both low intensity noise and wavelength tuning capability
    • Precision interferometric measurement requiring power instability below 0.02% over extended runs
    • Quantum optics experiments where both RIN and frequency stability affect measurement fidelity
  • laser

    1.5 μm Frequency-Stabilized Laser Seed Source

    Frequency stability achieved through error signal extraction and active feedback control; not just passive cavity engineering. That distinction determines what this seed laser is built for. Seed Laser Pro’s 1.5 µm Frequency-Stabilized Laser Seed Source delivers 20 to 30 mW of CW output at 1550 nm with 20 kHz linewidth, frequency drift below ±500 kHz RMS over two hours, and an error signal extraction architecture designed for integration into quantum technology platforms and precision measurement MOPA systems. PM1550 fiber output, PER 20 to 23 dB, SNR 55 dB. Power adjustment from 1 to 100%. Compatible with external frequency locking and downstream Erbium fiber amplifier seeding.

    Product Features

    • 20 kHz linewidth, ±500 kHz RMS frequency drift over 2 hours, single longitudinal mode CW at 1550nm
    • Error signal extraction technology enabling external frequency locking and active feedback integration
    • PM1550 fiber output, PER 20-23 dB, SNR 55 dB, power adjustment 1-100%
    • Noise suppression scheme, 12 VDC, -10 to 45°C operating range, 20-30 mW output

    Typical Applications

    • Quantum technology platforms requiring a frequency-stable, externally lockable 1550nm master oscillator
    • Precision measurement MOPA systems where the seed laser frequency must be actively referenced
    • Industrial sensing networks requiring a frequency-controlled 1550nm seed with long-term drift below ±500 kHz
    • Research setups using PDH or similar locking techniques that require an error signal output port
  • Frequency Fiber Laser

    1.5 μm High-Reliability Single-Frequency Seed Source

    Sub-1 kHz linewidth at 1550nm in a DBR architecture small enough to fit a 175mm chassis. That combination is rare at this wavelength.

    Seed Laser Pro’s 1.5 µm High-Reliability Single-Frequency Seed Source delivers 40 mW of CW output at 1530 to 1560 nm with linewidth below 1 kHz, mode-hop-free operation, and ±0.2 nm wavelength thermal tuning. PM1550 fiber output, PER above 20 dB, power stability P-P below 0.5%. Built specifically for quantum computing, quantum precision measurement, and high-sensitivity sensing applications where the telecom-band coherence of 1550nm and the spectral purity of a DBR seed must come together in one reliable source.

    Product Features

    • Sub-1 kHz linewidth, single longitudinal mode CW at 1530-1560nm, mode-hop-free operation
    • PM1550 fiber output, PER above 20 dB, optical SNR above 50 dB, power adjustment 1-100%
    • ±0.2nm wavelength thermal tuning range for precise positioning within the C-band
    • Power stability P-P below 0.5%, -10 to 45°C operating range, compact 175x140x25mm module

    Typical Applications

    • Quantum computing platforms using 1550nm photonic qubits and telecom-band quantum hardware
    • Quantum precision measurement requiring sub-kHz linewidth coherence at the telecom wavelength
    • High-sensitivity sensing systems where DBR-grade mode-hop-free reliability is a hard requirement
  • Frequency Fiber Laser

    1.5 μm Industrial Single-Frequency Seed Source

    The 1.5 μm DFB single-frequency seed source is a single-frequency laser based on fiber Bragg grating technology. Its core advantages include mode-hop-free single longitudinal mode output, high polarization purity, and excellent environmental stability.

    Product Features

    Stable Power
    Reliable Performance
    All-Fiber Structure
    Single-Mode Output

  • Linewidth Single-Frequency Fiber Laser

    1.5 μm Laser Phase-Modulated Fiber Seed Source

    Low phase noise and an all-polarization-maintaining optical path. These two properties define what this seed source is built for and they separate it from every other phase-modulated seed in this wavelength range.

    Seed Laser Pro’s 1.5 µm Laser Phase-Modulated Fiber Seed Source delivers 50 mW of CW output at 1530 to 1560 nm with adjustable bandwidth from 0.1 to 40 GHz, ultra-low phase noise, and an all-PM optical path throughout. PM1550 fiber output, PER above 20 dB, power stability P-P below 0.5%, ±0.2 nm wavelength tuning. Built for optical quantum communication, distributed acoustic sensing, coherent LiDAR, and femtosecond micromachining systems where controlled spectral broadening and phase noise performance determine system capability.

    Product Features

    • 0.1 to 40 GHz adjustable bandwidth, ultra-low phase noise, 50 mW CW at 1530-1560nm
    • All-polarization-maintaining optical path throughout, PM1550 output, PER above 20 dB
    • Power stability P-P below 0.5%, SNR above 50 dB, power adjustment 1-100%
    • ±0.2nm wavelength tuning, -10 to 45°C operating range, 175x140x25mm compact module

    Typical Applications

    • Optical quantum communication systems requiring phase-modulated, low-phase-noise 1550nm seed
    • Distributed acoustic sensing (DAS) using phase-modulated CW seed for coherent backscatter detection
    • Coherent LiDAR transmitters using bandwidth-controlled 1550nm phase-modulated sources
    • Femtosecond micromachining systems using 1550nm phase-modulated seed for ultrashort pulse chains
  • laser

    1.5 μm Point Light Source

    Eye-safe. Miniaturized. Wavelength-tunable. Three properties that make a 1550nm point light source genuinely useful in field-deployed LiDAR calibration, quantum technology instrument testing, and precision medical imaging setups.

    Seed Laser Pro’s 1.5 µm Point Light Source delivers 25 mW of CW output at 1530 to 1560 nm with 0.04 nm spectral bandwidth and ±0.2 nm wavelength tuning range. PM1550 fiber output, P-P stability below 0.5%, power adjustment from 1 to 100%. Operating range -10 to 45°C, compact 175 × 140 × 25 mm module, 5 VDC. Built for LiDAR receiver alignment, scientific research, device testing, and precision measurement and imaging where an eye-safe, stable, tunable reference point source is needed.

    Product Features

    • 25 mW CW at 1530-1560nm, 0.04nm spectral bandwidth, single-mode output
    • PM1550 fiber output, FC/APC, power stability P-P below 0.5%, 1-100% adjustment
    • ±0.2nm wavelength tuning range, customizable fiber length above 0.8m
    • Eye-safe 1550nm wavelength, 5 VDC, -10 to 45°C operating range, 175x140x25mm

    Typical Applications

    • LiDAR receiver calibration and alignment using a stable, eye-safe 1550nm point reference
    • Scientific research and experimental teaching requiring a clean, tunable 1550nm reference source
    • Device testing and measurement of PM1550 components, 1550nm detectors, and optical instruments
    • Precision measurement and imaging systems requiring a stable, miniaturized infrared point source
The seed laser determines the coherence quality of your entire system. A single frequency fiber seed laser emits on one longitudinal mode, delivering spectral purity, low phase noise, and long coherence length that multimode sources simply cannot match. Techwin manufactures ...

Frequently Asked Questions

What is a single frequency fiber seed laser?

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A single frequency fiber seed laser, also called a DFB fiber laser or single longitudinal mode laser, emits at one precise optical frequency with extremely narrow linewidth. Engineers use it as a master oscillator in MOPA systems or as a standalone source in applications that require high spectral purity, long coherence length, and low phase noise.

What linewidth do I need for spectroscopy?

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It depends on the absorption feature you are resolving. For TDLAS in combustion or gas sensing, sub-kHz linewidth is typically required to resolve Doppler-broadened absorption lines cleanly. For cavity-enhanced spectroscopy or optical frequency standards, Hz-level linewidth performance is the target.

What is the difference between a DFB and DBR seed laser?

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A DFB (Distributed Feedback) fiber laser writes a Bragg grating directly into the active fiber, which acts as both the gain medium and the frequency-selective element. A DBR (Distributed Bragg Reflector) laser uses separate Bragg gratings as external cavity mirrors with an active gain section between them. DFB fiber lasers are generally more compact and mechanically stable, which makes them the preferred architecture for robust single frequency operation in demanding environments.

What coherence length does a sub-kHz fiber laser achieve?

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Coherence length is inversely proportional to linewidth. A 1 kHz linewidth laser achieves a coherence length of approximately 95 km. At 100 Hz linewidth, that extends to around 950 km. For most interferometric sensing applications, sub-kHz performance already provides far more coherence length than the system requires.

What is a PM fiber seed laser and when do I need it?

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A PM (polarization-maintaining) fiber seed laser delivers output in a defined, stable polarization state through a fiber that suppresses cross-coupling between polarization axes. You need PM output when the downstream optical system, such as a fiber amplifier, electro-optic modulator, interferometer, or sensing coil, is polarization-sensitive. Most precision scientific and sensing applications rely on PM fiber seed sources.

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