Femtosecond dual-comb MIXSEL

J. Nürnberg; C. G. E. Alfieri; D. Waldburger; M. Golling; U. Keller

doi:10.1117/12.2513209

4 March 2019 Femtosecond dual-comb MIXSEL

J. Nürnberg, C. G. E. Alfieri, D. Waldburger, M. Golling, U. Keller

Proceedings Volume 10901, Vertical External Cavity Surface Emitting Lasers (VECSELs) IX; 109010J (2019) https://doi.org/10.1117/12.2513209
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

The modelocked integrated external-cavity surface-emitting laser (MIXSEL) integration allows modelocking in a simple straight linear cavity. The MIXSEL integrates the saturable absorber of a semiconductor saturable absorber mirror (SESAM) and the gain of a vertical external-cavity surface-emitting laser (VECSEL) in a single chip. With birefringent crystals, the MIXSEL cavity can be extended to provide a low noise, compact and cost-efficient dual frequency comb source for multiheterodyne applications. The crystals enable the generation of two orthogonally polarized frequency combs with tunable line spacing from the same cavity. For many applications, a broadband light source with excellent beam quality is desired. While the latter is resulting from the external cavity, the semiconductor layer design of the MIXSEL chip defines the spectral properties of the optical frequency combs. We present the techniques that were necessary to build the first broadband femtosecond dual-comb MIXSEL. Optimization of growth techniques and thermal properties enable the next generation of MIXSEL chips. With careful management of the roundtrip group delay dispersion, the new MIXSEL is capable of generating pulses as short as 139 fs with an average output power of 30 mW in single comb operation. In dual comb operation sub-400 fs with more than 3 nm of optical bandwidth are achieved. Two intracavity birefringent crystals counteract aliasing effects occurring due the broad optical bandwidth of the chip. This laser was optimized for dual-comb spectroscopy of acetylene but has also been used for LIDAR measurements without adjustments of the laser cavity.

Citation Download Citation

J. Nürnberg, C. G. E. Alfieri, D. Waldburger, M. Golling, and U. Keller "Femtosecond dual-comb MIXSEL", Proc. SPIE 10901, Vertical External Cavity Surface Emitting Lasers (VECSELs) IX, 109010J (4 March 2019); https://doi.org/10.1117/12.2513209

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KEYWORDS

Spectroscopy

Semiconductors

Absorption

Semiconductor lasers

Signal to noise ratio

Frequency combs

Mode locking

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