NLM Series Dual-wavelength Narrow Linewidth Laser

RealLight NLM Series Multi-Mode Dual-Wavelength Narrow Linewidth Laser Product Introduction

1. Product Overview
The RealStable® NLM Series multi-mode dual-wavelength narrow linewidth laser is a patented desktop light source independently developed by RealLight. It is specially designed for Shifted Excitation Raman Difference Spectroscopy (SERDS), dual-wavelength material metrology and biomedical optical diagnostic instruments. The unit integrates two independent VBG wavelength-locked optical paths and an integrated TEC thermostatic system. A single device realizes electronically controlled time-sharing switching of two narrow-linewidth lasers, eliminating the need for two separate lasers, simplifying the overall optical layout and reducing equipment size and integration costs.
Two mature standard wavelength sets are available: 784/785 nm (dedicated for differential Raman) and 785/1064 nm (composite long & short wavelength material analysis). Custom dual-wavelength combinations are supported. Equipped with dedicated PC control software for real-time equipment status monitoring and online firmware upgrade, it features hardware emergency stop, 0~5 V analog modulation and USB digital communication. Fiber outlets support universal FC/PC and SMA905 connectors. Matched with full RL-RP Raman probes, it forms a complete SERDS Raman detection system widely adopted by university labs, industrial quality inspection and medical optical instrument manufacturers.

2. Core Product Advantages
2.1 Single-chassis dual optical path time-sharing switching, ideal for SERDS Raman
Two independent wavelength-locked resonant cavities are built in for fast electronic switching between laser channels. The fixed wavelength offset between the two beams perfectly matches SERDS algorithm requirements. The adjacent 784/785 nm pair acquires two sets of spectra for differential calculation to fully eliminate sample fluorescence and instrument baseline noise, solving the industry issue where weak Raman signals are masked by strong luminescence from minerals, biomolecules and polymers. The 785/1064 nm long-short wavelength set simultaneously distinguishes organic and inorganic components for multi-substance characterization with one instrument. Compared with two discrete lasers, it removes the demand for dual power supplies, dual timing synchronization and dual optical alignment, significantly cutting hardware cost and commissioning complexity.

2.2 Synchronous ultra-narrow linewidth & superior spectral purity for both channels
Both laser channels deliver linewidth below 0.1 nm with side-mode suppression ratio up to 40 dB for excellent stray light rejection. Wavelength tolerance is controlled within ±0.5 nm with consistent monochromaticity across both beams, free of spurious peaks. High SNR Raman spectra can be acquired even for trace samples to improve detection precision of trace substances.

2.3 Closed-loop TEC cooling for synchronized ultra-stable wavelength & power
Dual-channel independent closed-loop thermoelectric cooling limits overall temperature drift below ±0.1 ℃ over 4 hours continuous operation. Wavelength stability of both channels reaches ±7 pm, while peak-to-peak power fluctuation stays under ±2%. Balanced power output requires no frequent calibration during long sampling cycles, meeting strict standards of quantitative analysis and metrology calibration.

2.4 High-power multi-mode output for large-area & batch sample testing
105 μm / NA 0.22 large-core multi-mode delivery fiber is adopted: 500 mW each for 784/785 nm; 500 mW @785 nm and 800 mW @1064 nm. Sufficient luminous flux rapidly excites dark, high-concentration and oversized samples to shorten single test duration, suitable for production line batch screening and large field sample analysis.

2.5 Full-function intelligent electronic control for automated integration
Dedicated PC software monitors real-time temperature, power and fault data and supports remote online firmware upgrade. Hardware emergency stop guarantees operational safety; 0~5 V analog modulation links external timing generators for pulsed excitation. Output power is continuously adjustable from 0 to 100%. Paired with USB interface, it enables timing synchronization with automated spectroscopy platforms and imaging equipment.

2.6 Standard desktop chassis with stable performance under wide temperature & humidity
Compact dimension 180×102×180.2 mm, total weight 1.2 kg, powered by +12 VDC with typical power consumption below 20 W. Operating temperature ranges from 10 ℃ to 35 ℃; storage temperature -10~60 ℃ with relative humidity 0~70% RH. No wavelength shift or power attenuation occurs during long-term operation in standard laboratories and ordinary industrial workshops.

3. Main Application Fields
3.1 Differential Raman Spectroscopy (SERDS) (Core Application)
Exclusive excitation source for SERDS with adjacent 784/785 nm wavelengths. Differential algorithm eliminates strong fluorescence background for non-destructive trace testing of minerals, biological tissues, polymers and hazardous chemicals. Ideal for laboratory desktop Raman and portable field screening devices, greatly enhancing detection capability of weak-signal samples.

3.2 Dual-Wavelength Material Metrology & Component Characterization
The 785/1064 nm long-short wavelength set captures synchronous Raman signals in visible and near-infrared bands to distinguish organics, inorganics, carbon materials and lithium battery active substances, applicable to material labs and quality inspection metrology instruments.

3.3 Biomedical Optical Equipment
Applied to dual-wavelength fluorescence imaging of biological tissues, cellular spectral analysis and minimally invasive optical diagnosis instruments. The all-in-one dual-light-source design reduces equipment volume for compact medical detectors.

4. Product Summary
The RealLight NLM Series multi-mode dual-wavelength narrow linewidth desktop laser integrates six core strengths: integrated electronically switchable dual optical paths, fixed wavelength offset optimized for SERDS, pm-level synchronized wavelength stability for both channels, ultra-narrow linewidth, high-power multi-mode output and complete intelligent control system. It resolves common drawbacks of discrete dual-laser systems including bulky footprint, complicated commissioning and high cost. Two standard wavelength portfolios cover differential Raman, material metrology and medical optics with custom wavelength options supported. Compatible with PC software, emergency stop, analog modulation and standard fiber connectors, and fully matchable with RL-RP Raman probes, it serves as the preferred domestic excitation source for SERDS Raman instruments, supporting mass OEM matching for research institutes, analytical instrument and medical equipment manufacturers.