Fiber lasers natively operate in the near-infrared. Nonlinear frequency conversion extends that spectral performance into the visible and UV. Techwin’s wavelength converted fiber laser range produces single frequency output at 193 nm, 266 nm, 509 nm, 532 nm, 780 nm, and 795 nm. Each output wavelength inherits the narrow linewidth, low phase noise, and single longitudinal mode characteristics of the fiber seed source. The result is an industrial-grade coherent source at wavelengths that matter for quantum sensing platforms, high-resolution spectroscopy, optically pumped magnetometry, and cold atom physics, without the maintenance demands of dye or solid-state alternatives.
QUICK SPECIFICATION SUMMARY
| Parameter | Range / Options |
| Output Wavelengths | 193 nm · 266 nm · 509 nm · 532 nm · 780 nm · 795 nm |
| Operation Mode | Single frequency, single longitudinal mode |
| Linewidth | Sub-kHz to Hz-level inherited from fiber seed |
| Polarization | PM fiber construction, specified PER |
| Output Type | Free space and fiber coupled |
| Applications | Quantum sensing · Spectroscopy · Magnetometry · Atomic physics · Laser cooling |
| Form Factor | Industrial-grade module, OEM-compatible |
How Wavelength Conversion Works
A wavelength converted fiber laser starts with a single frequency fiber seed in the near-infrared, typically at 1064 nm, 1550 nm, or 1560 nm. The seed output passes through a nonlinear crystal configured for second harmonic generation (SHG), sum-frequency generation (SFG), or higher-order harmonic conversion. The nonlinear stage performs the wavelength shift while preserving seed coherence.
This is the central advantage of the fiber-based approach. The converted output carries the spectral quality of the fiber seed directly. Narrow linewidth at the seed becomes narrow linewidth at the output. Low phase noise at the seed becomes low phase noise at the converted wavelength. Because the fiber source handles all gain, stability, and reliability engineering, the conversion stage introduces no additional spectral degradation under normal operating conditions.
This coherence inheritance is why wavelength converted fiber lasers have largely replaced dye lasers and many solid-state platforms in quantum physics and spectroscopy applications. They offer greater long-term stability, a smaller footprint, and lower maintenance burden.
Available Wavelengths and Applications
| Output Wavelength | Key Applications |
| 193 nm | Deep UV spectroscopy, photochemistry, semiconductor inspection |
| 266 nm | Fluorescence excitation spectroscopy, UV laser ablation, material analysis |
| 509 nm | Visible spectroscopy, atomic physics |
| 532 nm | Quantum optics, holography, precision interferometry |
| 780 nm | Rubidium D2 laser cooling, atom interferometry, quantum sensing |
| 795 nm | Rubidium D1 magnetometry, quantum storage |
Applications
Quantum Sensing
Quantum sensing platforms use atomic, ionic, or photonic systems to measure physical quantities, including magnetic fields, acceleration, rotation, and time, with precision that classical sensors cannot reach. Rubidium-based sensors operate at the 780 nm D2 and 795 nm D1 atomic transition lines. The laser source must maintain frequency stability, narrow linewidth, and resonance with the target transition throughout the measurement sequence.
Techwin’s 780 nm and 795 nm wavelength converted fiber lasers serve this role directly. Both outputs derive from single frequency fiber seeds and carry the coherence and stability that quantum sensing platforms require. The module form factor supports field deployment and OEM integration outside controlled laboratory conditions.
Optically Pumped Magnetometry
Optically pumped magnetometers use resonant laser-atom interaction in alkali metal vapor to measure magnetic field strength with high sensitivity. The 795 nm wavelength corresponds to the rubidium D1 transition, which is the standard choice for vapor cell magnetometer systems used in geophysical surveys, medical imaging, and navigation.
For this application, the laser source must maintain precise frequency alignment with the D1 transition across varying temperature and environmental conditions. Linewidth, frequency stability, and output power consistency are all hard requirements. Techwin’s 795 nm single frequency converted laser meets these in a robust module form factor qualified for field-deployed and OEM magnetometer instruments.
Spectroscopy
High-resolution spectroscopy demands narrow linewidth, stable center frequency, and clean single-mode output. Techwin’s wavelength converted range covers multiple spectroscopic windows, from deep UV at 193 nm and 266 nm through to visible wavelengths at 509 nm and 532 nm.
The 266 nm output supports fluorescence excitation spectroscopy and UV ablation for material analysis. The 532 nm output covers atomic and molecular absorption features used in environmental monitoring, chemical analysis, and quantum optics. All outputs maintain single frequency, narrow linewidth performance to resolve fine spectral features that multimode sources cannot distinguish.
Atomic Physics and Laser Cooling
The 780 nm output targets the rubidium D2 transition at 780.24 nm, used in laser cooling, magneto-optical traps, Bose-Einstein condensate experiments, and atom interferometers. Rubidium is one of the most widely used species in cold atom physics because its cooling transitions are accessible through near-infrared frequency conversion.
A 1560 nm single frequency fiber seed, frequency doubled to 780 nm, produces the coherent output required for Doppler cooling and trapping. Compared to free-running diode lasers at 780 nm, the fiber-based approach delivers superior long-term frequency stability and mode-hop-free operation without requiring continuous active stabilization.
Designed for Applications Traditionally Served by Premium Single-Frequency Platforms
For many buyers, performance benchmarks in this category are set by premium single frequency platforms such as NKT Photonics Koheras. The barrier to procurement is often price, lead time, or minimum order volumes that make those platforms impractical for smaller programs, prototype builds, or cost-sensitive instrument designs.
Techwin’s wavelength converted fiber lasers are built on DFB fiber seed architecture with PM fiber construction throughout. Linewidth, phase noise, polarization extinction ratio, and output power are verified on every unit before shipment. For programs that require an alternative to premium single frequency platforms at more accessible pricing and lead times, Techwin’s engineering team can review your specification and confirm fit. Custom configurations are available for wavelengths and output parameters outside the standard range.
Industrial-Grade Construction
Research-grade laser sources are designed for optical benches in temperature-controlled laboratory environments. Techwin’s wavelength converted fiber laser modules are designed to operate reliably outside those conditions, including in field-deployed sensors, OEM instruments, and systems running continuously without regular maintenance or realignment.
All-fiber construction eliminates free-space optical elements that are sensitive to vibration, temperature cycling, and mechanical shock. Output power, spectral characteristics, and polarization state remain stable across the specified operating temperature range. Every unit ships tested against linewidth, output power, and frequency stability specifications.
A laser that performs in the laboratory but drifts in deployment is not a usable component. Techwin’s modules are specified and tested for both environments.
Wavelength Selection Guide
The wavelength is determined by the application. Use this as a starting reference:
- Rubidium D2 laser cooling or quantum sensing at the D2 line: 780 nm
- Rubidium D1 magnetometry or quantum storage: 795 nm
- Visible spectroscopy, quantum optics, or interferometry: 532 nm or 509 nm
- UV fluorescence spectroscopy or laser ablation: 266 nm
- Deep UV photochemistry or semiconductor inspection: 193 nm
For wavelengths or output configurations outside the standard range, contact Techwin. Frequency converted outputs at other visible and near-UV wavelengths are available on a custom basis.
