Abstract
We propose a coherent optical negative feedback method for reducing linewidth of single-mode semiconductor lasers, which requires only an optical filter. Results of numerical analysis indicate that the power spectral density of FM noise can be reduced by more than 40 dB and the subkilohertz spectral linewidth can be obtained with our method when the spectral linewidth is 10 MHz under a free running condition. From a proof-of-concept experiment, we confirmed that the spectral linewidth of a single-mode semiconductor laser is reduced when using our method from 6.4 MHz to 6.5 kHz. This result confirms that the spectral linewidth can be reduced by at least 30 dB, which proves the validity of our method.
Original language | English |
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Article number | 6966752 |
Pages (from-to) | 340-343 |
Number of pages | 4 |
Journal | IEEE Photonics Technology Letters |
Volume | 27 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2015 Feb 15 |
Keywords
- Diode lasers
- Laser stability
- Optical feedback
- Optical injection
- Optical resonators
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering