Agilent/Keysight 81640B Tunable Laser Source

The Agilent/Keysight 81640B is a continuous wave tunable laser source engineered for optical component testing, metrology, and research. It delivers stable, precise optical power across tunable wavelengths with narrow linewidth performance. The instrument supports both internal and external modulation, making it suitable for complex optical system characterization in laboratory and integration environments.

– Technical Specifications

Laser Output
• Type: Continuous Wave (CW) Tunable Laser Source
• Wavelength Range: Module-dependent
• Tuning Speed: Module-dependent
• Wavelength Accuracy: Specified in picometers (pm)
• Wavelength Stability: Specified in pm/°C or pm/hour
• Linewidth: Specified in kHz or MHz
• Output Power Range: Specified in dBm or milliwatts (mW)
• Power Stability: Specified in dB or % per hour/minute
• Power Accuracy: Specified in dB or %
• Polarization: Single-mode or multi-mode fiber output with polarization extinction ratio (PER)
• Mode Field Diameter (MFD): Approximately 9 µm for standard single-mode fiber
• Return Loss: Specified in dB

Modulation Capabilities
• Amplitude Modulation (AM): Internal or external, frequency and depth specified by module
• Frequency Modulation (FM): Internal or external, frequency range and deviation specified by module
• On/Off Modulation: Pulsed operation with specified switching speeds

– Key Features

• Narrow spectral linewidth for high-resolution spectroscopy and interferometry
• Tunable wavelength operation across module-specific ranges
• Long-term and short-term wavelength stability for precision measurements
• Flexible modulation options for dynamic optical testing
• Single-mode and multi-mode fiber output configurations
• Return loss performance optimized to prevent laser instability

– Typical Applications

• Optical component characterization and device testing
• Spectroscopic measurements requiring narrow linewidth sources
• Interferometric metrology and optical system development
• Research environments demanding wavelength-tunable CW sources

– Compatibility & Integration

• Control Interface: GPIB (IEEE 488.2), SCPI command language
• Standard rack-mountable or benchtop form factors
• Warm-up time required to reach stable operating parameters