Plasma HCL-100V Helium-Cadmium & Nitrogen Molecular Laser System

Overview

The Plasma HCL-100V is a dual-mode gas laser system integrating both continuous-wave (CW) helium-cadmium (HeCd) and pulsed nitrogen (N₂) laser technologies in a modular, laboratory-grade platform. Engineered for precision photonic applications requiring stable UV output, the system delivers two distinct operational modes: (1) CW emission at 325 nm and/or 442 nm via HeCd plasma discharge — optimized for interferometry, fluorescence excitation, and holography; and (2) nanosecond-pulsed output at 337.1 nm from molecular nitrogen transitions — suited for time-resolved spectroscopy, UV lithography alignment, and photochemical activation. The HeCd section operates on the principle of electron-impact excitation in a low-pressure He–Cd vapor mixture, generating narrow-linewidth radiation with high spatial coherence (TEM₀₀ mode available up to 150 mW at 442 nm). The N₂ module employs transverse or longitudinal electrical discharge to produce gain in the second positive system of N₂, enabling sub-10 ns pulses with peak powers exceeding 30 kW. Both subsystems share common beam routing infrastructure and thermal management architecture, ensuring mechanical stability and long-term pointing reproducibility.

Key Features

• Multi-wavelength capability: Simultaneous or independent operation at 325 nm (HeCd), 442 nm (HeCd), and 337.1 nm (N₂) — configurable via optical switching or physical beam separation
• High beam quality: TEM₀₀ mode available across all HeCd variants; M² < 1.1 typical; polarization extinction ratio ≥100:1
• Coherence control: Models with “I” designation provide extended coherence length (≥30 cm), supporting applications in white-light interferometry and coherent imaging
• Pulse performance: N₂ laser offers adjustable repetition rate (1–1000 Hz), pulse width ≤8 ns (FWHM), and pulse energy up to 240 μJ — compatible with gated detection systems
• Robust gas handling: Sealed-tube HeCd design with >5000 h nominal tube lifetime; N₂ module uses replaceable gas cartridges or continuous-flow configurations
• Integrated safety compliance: Interlocked housing, key-controlled enable circuitry, and built-in laser classification labeling per IEC 60825-1:2014 and ANSI Z136.1

Sample Compatibility & Compliance

The HCL-100V is compatible with standard optical breadboards, kinematic mounts, and UV-grade fused silica or CaF₂ optics. Its 325 nm and 337.1 nm outputs are suitable for photoresist exposure (e.g., Shipley S1800 series), UV Raman excitation, and semiconductor inspection metrology. All models conform to CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU) and low-voltage safety (LVD Directive 2014/35/EU). The system supports GLP/GMP-aligned operation through optional audit-trail-enabled power logging and interlock status recording. While not FDA 21 CFR Part 11 certified out-of-the-box, its analog/digital I/O interface allows integration into validated environments via third-party data acquisition platforms compliant with 21 CFR Part 11 Annex 11.

Software & Data Management

The HCL-100V includes RS-232 and USB 2.0 interfaces for remote control of laser enable/disable, repetition rate (N₂), and output power modulation (HeCd via current regulation). Optional Plasma Control Suite v3.x provides GUI-based parameter configuration, real-time power monitoring, pulse timing synchronization (TTL trigger input/output), and automated calibration logging. Data export formats include CSV and HDF5, supporting traceability in ISO/IEC 17025-accredited laboratories. Firmware updates are delivered via signed binary packages with SHA-256 verification to ensure integrity during field deployment.

Applications

• Lithography process development: Mask alignment and direct-write patterning using 337.1 nm pulses with diffraction-limited spot sizes (<1 µm with high-NA objectives)
• Fluorescence lifetime imaging (FLIM): Time-correlated single-photon counting (TCSPC) excitation at 325 nm for NAD(P)H and tryptophan autofluorescence
• Holographic data storage: High-coherence 442 nm source enabling >10⁶ page capacity in photopolymer media
• UV spectroscopy calibration: NIST-traceable line sources for spectrometer wavelength validation (325.02 nm, 441.57 nm, 337.09 nm)
• Thin-film ablation studies: Nanosecond UV pulses for controlled removal of ITO, SiO₂, and organic layers without thermal damage
• Gas-phase reaction kinetics: Pump-probe experiments utilizing synchronized 325 nm pump and 337 nm probe beams

FAQ

What is the typical warm-up time required for stable output?
The HeCd module achieves spectral and power stability within 30 minutes after cold start; the N₂ laser stabilizes in under 5 minutes following initial discharge conditioning.
Can the 325 nm and 442 nm beams be combined collinearly?
Yes — using a dichroic mirror (325/442 nm) included in the optional beam-combining kit, with residual wavefront distortion < λ/8 over 10 mm clear aperture.
Is water cooling mandatory for the N₂ module?
Water cooling is required only for LGI-511 (240 μJ) operation above 200 Hz; LGI-505 and NPL-3 models support air-cooled operation up to maximum rated repetition rate.
How is laser safety documentation provided?
Each unit ships with a site-specific Laser Safety Manual, hazard zone calculations (per ANSI Z136.1), and OEM-certified Nominal Ocular Hazard Distance (NOHD) reports.
Are replacement gas tubes available as spare parts?
Yes — Plasma supplies factory-reconditioned HeCd tubes with full performance certification and 12-month warranty; N₂ gas cartridges are consumables with shelf life of 24 months when sealed.