Fourier-transform spectroscopy using an Er-doped fiber femtosecond laser by sweeping the pulse repetition rate

• DOI: 10.1038/srep15726
• Publication Date: 2015-10-27T10:38:40Z
• Authors: Keunwoo Lee; Joohyung Lee; Yoon-Soo Jang; Seongheum Han; Heesuk Jang; Young-Jin Kim; Seung-Woo Kim
• Keywords: Picosecond; Fourier transform spectroscopy

Femtosecond lasers allow for simultaneous detection of multiple absorption lines a specimen over broad spectral range infrared or visible light with single spectroscopic measurement. Here, we present an 8-THz bandwidth, 0.5-GHz resolution scheme Fourier-transform spectroscopy using Er-doped fiber femtosecond laser. A resolving power 1.6 × 10(4) about 1560-nm center wavelength is achieved by sweeping the pulse repetition rate source on Mach-Zehnder interferometer configured to capture interferograms 0.02-fs temporal sampling accuracy through well-stabilized 60-m unbalance arm length. dual-servo mechanism realized combining mechanical linear stage electro-optic modulator (EOM) within laser cavity, enabling stable control 1.0-MHz scan 0.4-Hz steps reference Rb clock. Experimental results demonstrate that P-branch H(13)CN cell can be observed signal-to-noise ratio reaching 350 most intense line.