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.
| Technical Parameter | Unit | Technical Specification | ||
|---|---|---|---|---|
| Min | Typical | Max | ||
| Central Wavelength | nm | 1550 | ||
| Laser Mode | / | Single Longitudinal Mode, Continuous Wave | ||
| Output Power | mW | 20 | 30 | |
| Linewidth | kHz | 15 | 20 | 25 |
| Optical Signal-to-Noise Ratio | dB | 55 | ||
| Wavelength Drift (RMS @ 2h) | kHz | ±500 | ||
| Output Power Adjustment | % | 1–100 | ||
| Operating Temperature | °C | −10 | 45 | |
| Polarization Type | / | Linear Polarization | ||
| Polarization Extinction Ratio | dB | 20 | 21 | 23 |
| Operating Voltage | VDC | 12 | ||
| Output Fiber Type | / | PM1550 | ||
| Power Consumption | W | |||
Seed Laser Pro makes two frequency-stabilized 1550 nm products. Understanding the difference between them is the first step to selecting the right one.
The Frequency-Stabilized Laser for High-Sensitivity Sensing is a standalone source. Its dual closed-loop stabilization system works internally, a fast piezoelectric loop suppresses short-term noise, a slow thermal loop corrects long-term drift. No external reference is required. The laser stabilizes itself and delivers a clean output for direct use in fiber sensing, spectroscopy, and standalone interferometric setups.
This Frequency-Stabilized Laser Seed Source is built for a different architecture. It incorporates error signal extraction technology, which means the laser outputs not just the optical signal but also the error signal needed for an external control loop to actively lock the laser frequency to a reference. That reference could be an external optical cavity, an atomic transition, an optical frequency comb, or another frequency standard relevant to the quantum technology or precision measurement system the laser is being integrated into.
This is a seed source in the specific sense that it is designed for integration as the master oscillator in a larger system with its own control architecture, not as a self-contained instrument.
| Feature | Freq-Stabilized Sensing Laser | This Seed Source |
|---|---|---|
| Stabilization type | Internal dual closed-loop | Error signal extraction for external locking |
| Reference required | None, self-contained | External optical or atomic reference |
| Primary role | Standalone source | Master oscillator in larger system |
| Environmental compensation | Intelligent on-board | System-level (handled externally) |
| Target buyer | Sensing instrument builder | Quantum tech / precision measurement integrator |
Error signal extraction is the technique at the core of most high-performance frequency locking schemes. In a Pound-Drever-Hall (PDH) lock, the laser frequency is modulated at a radio frequency, and the reflected signal from a reference cavity is demodulated to produce an error signal. That error signal is fed back to the laser’s frequency actuator to lock the laser to the cavity resonance.
For this to work, the laser must produce an output that can be modulated and whose frequency response is fast enough to follow the feedback correction signal. The error signal extraction technology specified for this seed source is designed around exactly this requirement — providing an accessible signal path for the external control loop to use.
The practical consequence for quantum technology applications is significant. Quantum sensing platforms, optical atomic clocks, and quantum computing control loops that require a 1550 nm reference laser typically lock it to an ultra-stable optical cavity or an optical frequency comb output. Having a seed laser with built-in error signal extraction architecture eliminates custom engineering of the locking interface, shortening integration time substantially.
±500 kHz RMS frequency drift over two hours is the specification that applies to this laser operating without external locking. that is, with only the on-board noise suppression scheme active.
When this laser is locked to an external reference using the error signal extraction output, the achieved frequency stability is determined by the external loop, the reference cavity or atomic standard, and the laser’s frequency actuator response; not by the ±500 kHz free-running specification. The free-running spec defines how stable the laser is as a starting point before the external loop is closed.
For a seed laser going into a quantum technology system where it will always be externally locked, ±500 kHz free-running stability means the external control loop’s capture range and lock acquisition are straightforward, even without advanced pre-search routines.
This seed source connects directly to Erbium-doped PM1550 fiber amplifier input stages. PM1550 output with PER above 20 dB ensures the amplifier receives a well-defined polarization state, which is required for PM amplifier chains used in coherent beam combining and precision interferometry applications where the amplified output must maintain a defined polarization relationship with other system elements.
The frequency stability and error signal architecture carry through amplification. A seed locked to an external reference via the error signal output produces an amplified output at the same locked frequency, with the frequency control provided by the master oscillator inheriting into the amplified output.
For the downstream high-power 1550 nm amplifier options, see Seed Laser Pro’s 1.5 µm 0.2 to 2W High-Power Single-Frequency Laser and 1.5 µm 2 to 20W configuration.
The Frequency-Stabilized Laser for High-Sensitivity Sensing is a self-contained instrument with internal dual closed-loop stabilization requiring no external reference. This Frequency-Stabilized Laser Seed Source incorporates error signal extraction technology for integration into systems that actively lock the laser frequency to an external reference such as an optical cavity or atomic transition. This product is a master oscillator component for a larger system, not a standalone instrument.
Error signal extraction provides the control signal needed for an external feedback loop to lock the laser frequency to a reference. In a PDH locking scheme, the error signal is derived from the interaction between the modulated laser output and a reference cavity. The error signal extraction technology built into this laser provides an accessible interface for that external control loop, enabling tight frequency locking to cavity resonances, atomic references, or optical frequency comb outputs used in quantum technology platforms.
This is the free-running frequency stability of the laser with only its on-board noise suppression active and no external locking applied. When integrated into a system with an active external frequency lock, the achieved stability is determined by the external loop and reference. The ±500 kHz free-running specification defines the starting point that the external loop works from and sets the capture range requirement for initial lock acquisition.
Yes. PM1550 output, single longitudinal mode CW operation, and error signal extraction make this suitable as the master oscillator in coherent beam combining architectures using 1550 nm Erbium-band amplifiers. The frequency control provided by the external lock applied via the error signal output maintains the phase relationship across all seeded amplifier branches.
PM1550 fiber amplifiers in the Erbium gain band are directly compatible. Seed Laser Pro’s 1.5 µm high-power single-frequency laser range covers 0.2 W to 120 W in the same PM1550 fiber architecture. Contact Seed Laser Pro with your target output power and system architecture for configuration recommendations.
Seed Laser Pro’s 2.0 µm Point Light Source delivers 25 mW of CW output at 1950 nm with M² below 1.05, 0.04 nm spectral bandwidth, and power stability below 0.5% peak-to-peak. The near-diffraction-limited beam quality and eye-safe operating wavelength make it the right choice for spatial positioning, LiDAR calibration, instrument testing, and scientific research where precision spot quality at 2 µm is the primary requirement. Automotive-grade robustness. PM1950 or SM1950 fiber output. Multi-wavelength customization available.
The 1.5 μm ultra-low noise seed source features completely independent intellectual property rights and performance reaching an internationally leading level. It adopts an innovative combined optical and optoelectronic feedback noise suppression scheme, achieving intensity noise lower than −138 dB/Hz in the 1 MHz–100 MHz frequency range, and power stability better than 0.5% over 30 minutes.
Ultra-Low Intensity Noise
Excellent Power Stability
Completely Independent Intellectual Property Rights
Quantum Communication
Distributed Fiber Sensing
Coherent Optical Measurement
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.
-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.
