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Q: Fachverband Quantenoptik und Photonik
Q 16: Laser Developments and Applications
Q 16.4: Talk
Monday, March 11, 2019, 14:45–15:00, S SR 211 Maschb.
Extended-cavity diode laser at 633 nm stabilized to iodine using Noise-Immune Cavity-Enhanced Optical Heterodyne Molecular Spectroscopy (NICE-OHMS) — •Florian Krause, Uwe Sterr, and Erik Benkler — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig
Helium-neon lasers at 633 nm are still widely-used for interferometry and metrology. Iodine-stabilized helium-neon lasers are used as frequency standards for calibration with uncertainty 2.1×10−11 and instabilities of 1.1×10−11 at 1 s. However, the technical know-how for building and maintaining helium-neon laser is dying out. An attractive alternative to these gas lasers are diode laser systems stabilized to molecular references.
Here we present a 633 nm diode laser system stabilized to Doppler-free hyperfine components of the iodine P(33) 6-3 transition. We employ the NICE-OHMS technique with an external cavity containing a 10 cm long Brewster windowed iodine cell. This system has achieved a frequency instability of 3.4× 10−12 at 1 s, which is lower than the instability of PTB’s iodine-stabilized helium-neon lasers (4.1× 10−12 at 1 s).