Journal: Optics Express

Article Title: Dual electro-optic optical frequency combs for multiheterodyne molecular dispersion spectroscopy

doi: 10.1364/oe.23.021149

Figure Lengend Snippet: Fig. 4. Detailed block diagram of the dual-comb multiheterodyne dispersion gas analyzer. RFO, Reference frequency oscillator; SG1, Signal generator at frequency fPM1 ; SG2, Signal generator at frequency fPM2 ; SG3, Signal generator at frequency fAOM; SG3, Signal generator for the acquisition clock; LD, Laser diode; PM, Electro-optic phase modulator; GS, Gas sample; AOM, Acousto-optic modulator; FPC, Fiber polarization controller; PD, Photodiode; BPF, Band-pass filter; ACQ, Acquisition hardware; L-I D, Multi-channel lock-in detector. As a reference, the typical spectrum of the optical (bottom left) and a RF (bottom right) combs generated by the setup are shown for repetition frequencies of 8 GHz and 100 kHz respectively. The spectral coverage of the OFCs is roughly 2.6 nm.

Article Snippet: The optical combined signal is detected by an amplified InGaAs photodetector (PDA10CF, Thorlabs Inc., New Jersey, USA) and the resulting RF comb band pass filtered (SIF-40 + , Mini-Circuits Inc., New York, USA) and digitized by a 14-bit acquisition board (PDA14, Signatec Inc., California, USA).

Techniques: Blocking Assay, Dispersion, Generated