2024-03-28T09:46:27Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1740832019-01-16T01:56:24Zcom_10261_2855com_10261_4col_10261_2857
Semiconductor laser linewidth reduction by six orders of magnitude via delayed optical feedback
Brunner, Daniel
Luna, R.
Delhom i Latorre, A.
Porte, Xavier
Fischer, Ingo
Ministerio de Economía y Competitividad (España)
We demonstrate a coherence increase by six orders of magnitude of a standard quantum well semiconductor laser. Using a simple, optical-fiber-based feedback scheme, we stabilize the laser in a high-gain mode of a long external cavity. In a modified self-heterodyne measurement, we mix the high-gain mode with a strongly suppressed side mode and obtain an interference linewidth of only 12.6 Hz, corresponding to a decoherence of (3.1±2.9) Hz. In an independent characterization using an etalon, we deduce an upper limit of 300 Hz for the laser linewidth. The laser stably resides in this mode for tens of seconds. Our results agree with theoretical predictions.
2019-01-15T08:46:07Z
2019-01-15T08:46:07Z
2017-01-01
artículo
Optics Letters 42(1): 163-166 (2017)
0146-9592
http://hdl.handle.net/10261/174083
10.1364/OL.42.000163
1539-4794
http://dx.doi.org/10.13039/501100003329
eng
https://doi.org/10.1364/OL.42.000163
Sí
closedAccess
Optical Society of America