High-resolution and ultra-broadband direct-comb absolute-spectroscopy by means of the scanning micro-cavity resonator (smart) technique

Gambetta, Alessio

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https://hdl.handle.net/2142/100788 Copy

Description

Title

High-resolution and ultra-broadband direct-comb absolute-spectroscopy by means of the scanning micro-cavity resonator (smart) technique

Author(s)

Gambetta, Alessio

Contributor(s)

• Galzerano, Gianluca
• Laporta, Paolo
• Coluccelli, Nicola
• Wang, Yuchen
• Vicentini, Edoardo

Issue Date

2018-06-20

Keyword(s)

Mini-symposium: Frequency-Comb Spectroscopy

Abstract

By exploiting scanning Fabry-Perot micro-cavity resonator ´ (SMART) we developed a simple and compact spectrometer capable of resolving the mode structure of an optical frequency comb, with a frequency resolution limited only by the comb tooth linewidth. The SMART approach can be adopted in any spectral window from UV to THz and represents an easy and completely “lockingfree” approach to direct-comb spectroscopy, drastically reducing the system complexity when compared to the more conventional methods like the VIPA, dual- comb and Vernier. Furthermore, high-speed/highsensitivity detection and straightforward absolute calibration of the optical-frequency axis are still granted by the SMART spectrometer, together with an ultimate resolution limited only by the optical linewidth of the frequency comb source adopted for the measurement. We present an application to broadband and high-precision spectroscopy of acetylene at 1.54 µm. Also, by means of an auxiliary 2500-finesse cavity exploited as a sample with narrow- transmission features, we show the ability of the SMART approach to resolve the 400 kHz resonances of the auxiliary cavity, demonstrating a final resolution well below than the 20 MHz linewidth of the transmission-modes of the SMART micro-resonator employed for optical- detection.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100788

DOI

10.15278/isms.2018.WA08

Copyright and License Information

Copyright 2018 Alessio Gambetta

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