In the wave of laser technology moving from the laboratory to industrial applications, green laser, with its unique wavelength advantage of 532nm, is becoming a core tool
in fields such as precision processing, biomedicine, and spectral analysis. The Single Longitudinal Mode Green DPSS Laser of SOFN Instruments, taking the single longitudinal
mode technology as a breakthrough point, has pushed the purity, stability and coherence of the laser to a new height, providing a "ruler of light" for scientific research
exploration and high-end manufacturing.
Technological breakthrough: Single longitudinal mode reconstruction of laser purity limit
Traditional green lasers often encounter the problem of spectral broadening caused by multi-mode competition. However, SOFN Instruments has achieved stable output in a
single longitudinal mode through its unique in-cavity mode selection technology and temperature control system. Its technical parameters can be regarded as industry benchmarks:
The spectral line bandwidth is less than 3MHz, which is only 1/10 of that of conventional lasers and comparable to the monochromaticity of gas lasers.
The coherent length is over 100 meters, more than twice that of similar products, and it can support long-range coherent applications such as holographic interference and
optical fiber sensing.
The beam quality M² is less than 1.05, approaching the theoretical limit, ensuring that the focused spot diameter is less than 1.0mm and the energy density is increased by 30%.
The core innovation lies in the design of the dual temperature-controlled frequency doubling cavity: The laser crystal and the nonlinear crystal are independently temperature-controlled
through the semiconductor cooler (TEC), with an accuracy of ±0.1℃, completely eliminating thermally induced frequency drift. In combination with the adaptive polarization compensation
system, the linear polarization ratio is made greater than 100:1, significantly improving the beam pointing stability (<10µrad/3 hours).
Performance advantage: An all-round player from the laboratory to the production line
In the Precision Testing Laboratory of Tsinghua University, this laser, as the excitation source of the Raman spectroscopy system, successfully resolved the weak signal of the single-layer
structure of graphene, and the signal-to-noise ratio was twice as high as that of the traditional light source. On BGI's DNA sequencing platform, the characteristic of power stability <±1%
ensures the long-term consistency of fluorescently labeled signals and increases sequencing throughput by 15%.
In industrial application scenarios, Saifan lasers demonstrate stronger adaptability:
Micro-material processing: In the ITO film etching of photovoltaic cells, a 0.8mm spot combined with a 200mW output power enables precise processing with a line width of 2μm, and the
edge burrs are less than 50nm.
Wafer inspection: An online inspection solution provided for SMIC, which utilizes a spot roundness of over 95% to achieve sub-micron level identification of wafer surface defects, reducing
the missed detection rate to 0.01%.
Biomedical: In flow cytometers, its noise level of less than 0.1% enables the accuracy rate of cell sorting to exceed 99.5%.
Application scenarios: Cross-border empowerment in ten major fields
From basic research to intelligent manufacturing, the all-solid-state single longitudinal mode green laser of SOFN Instruments has formed ten core application scenarios:
Raman spectroscopy: As an excitation light source, to analyze the energy level structure of nanomaterials;
DNA sequencing: Improving the signal-to-noise ratio of fluorescent labeling signals;
Particle counting: Identifying 0.3μm particles in cleanroom testing;
Holographic technology: Records the phase information of dynamic three-dimensional images;
Wafer inspection: Achieve online screening of surface defects on semiconductor wafers;
Micromaterial processing: Complete laser direct writing of flexible electronic circuits;
Photoluminescence: Studying the excited state characteristics of quantum dot materials;
Physics experiment: The optical dipole force required to generate a cold atomic trap;
Video projection: As a three-primary-color light source, it achieves a display of 1 billion colors;
Precision measurement: Set up a laser interferometer for nanoscale displacement detection.
User Witness: Dual recognition of research and industry
In the quantum optics experiment, the coherence length of the Sevan laser exceeded 120 meters, enabling us to observe the interference fringes of cold atomic clusters for the first time.
-- Quantum Laboratory of University of Science and Technology of China
After 8,000 hours of continuous operation, the power attenuation is less than 5%, completely solving the pain point of production line shutdown calibration. -- Laser Processing Division of CATL
It is worth noting that SOFN Instruments offers three power specifications (50mW/100mW/200mW) for different demands and achieves seamless integration with devices such as spectrometers
and scanning galvanometers through analog /TTL modulation interfaces. Its drive power supply adopts military-grade components and can operate stably in an environment ranging from
-20℃ to +70℃. It is particularly suitable for extreme scenarios such as battery pack testing of new energy vehicles.
Future Layout: The Infinite Possibilities of Single-frequency Laser Technology
With the penetration of green lasers in emerging fields such as lithium battery copper foil welding and AR optical waveguide manufacturing, Sefan Optoelectronics is accelerating the research
and development of picosecond-level ultrafast single longitudinal mode green lasers and exploring fiber-coupled output modules to adapt to portable devices such as endoscopes and lidars.
As the company's chief scientist put it, "Single longitudinal mode technology is not only the guarantee of spectral purity, but also the cornerstone of future photonic integrated systems."
From precise spectroscopy in the laboratory to micro-nano processing on the production line, the all-solid-state single longitudinal mode green laser of SOFN Instruments is reshaping the
boundaries of laser applications with a "monochrome revolution". Choosing Saifan is choosing a beam of technological light that penetrates the unknown and measures accuracy.
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