Introduction
The SL 03-Series Stabilized HeNe Laser is designed for high precision applications, featuring a certificate of absolute frequency measured against an iodine-stabilized HeNe laser. It includes a marking for the beam's plane of polarization and offers an adjustable operating temperature range. The laser supports fiber coupler installation and alignment, as well as the installation of a Faraday isolator to eliminate back reflection.

Design and Operation
The laser employs a dual longitudinal mode stabilization technique, ensuring high frequency and amplitude stabilities, low optical feedback, and rapid warm-up. It consists of a compact cylindrical head with a laser tube and a separate table-top housing with high-voltage supply and control electronics. A front-panel switch allows selection between frequency-stabilized or amplitude-stabilized modes. An internal thread at the beam exit facilitates the mounting of mechanical shutters or optical components.

Technical Specifications

• Wavelength: 632.8 nm
• Output Power: ≥ 0.8 mW (typical 1.0 mW)
• Amplitude Noise: < 0.2% (30 Hz - 10 MHz)
• Beam Diameter: 0.55 mm (TEM00)
• Beam Divergence: 1.5 mrad (TEM00)
• Beam Polarization: Linearly polarized longitudinal mode
• Warm-up Time: ≤ 10 minutes
• Frequency Stability: ± 1∙10^-9 / ± 2∙10^-9 / ± 1∙10^-8 over 1 min / 1h / 24h
• Amplitude Stability: Approx. ± 0.5% / ± 1% / ± 2.5% over 1 min / 1h / 24h
• Max Thermal Frequency Drift: < 1 MHz/K
• Max Tolerated Optical Feedback: < 10^-5
• Operating Temperature Range: +15°C to +30°C
• Storage Temperature Range: -20°C to +50°C
• Typical Lifetime: 30,000 hours
• Power Consumption: < 20 W
• Line Voltage: AC 100-240 V / 47-63 Hz
• Dimensions: Laser head Ø 34.9 x 280 mm / Electronic unit 172 x 60 x 230 mm
• Weight: Laser head 600 g / Electronic unit 1,600 g
• Laser Safety Class: 3R / IIIa according to EN 60825-1 / ANSI Z136.1

Major Features and Benefits

• High frequency or amplitude stability
• Two operation modes: frequency stabilized or amplitude stabilized
• Rapid warm-up
• Compact design
• Internal thread at beam exit for installing items such as fiber couplers
• CE-certified for compliance with EC-Guidelines 73/23/EEC and 89/336/EEC, and harmonized EN-Standards: EN 61010-1, EN 60825-1, EN 55011, and EN 50082-1

Safety Warning
Do not stare into the beam or view the beam using optical instruments. The laser is classified as Class 3R / IIIa.