Abstract
Spectral properties, both the optical spectrum and the intensity noise spectrum, of a broad-area diode laser with off-axis external-cavity feedback are presented. We show that the optical spectrum of the diode laser system is shifted to longer wavelengths due to the external-cavity feedback. The intensity noise spectrum of the diode laser shows that the intensity noise is increased strongly by the external-cavity feedback. External-cavity modes are excited in the external cavity even in the off-axis configuration. The peak spacing of the intensity noise spectrum shows that single roundtrip external-cavity modes are excited. We believe that the four-wave mixing process in the broad-area diode laser is responsible for the establishment of the external-cavity mode.
| Original language | English |
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| Article number | 171112 |
| Journal | Applied Physics Letters |
| Volume | 103 |
| Issue number | 17 |
| Number of pages | 5 |
| ISSN | 0003-6951 |
| DOIs | |
| Publication status | Published - 2013 |