FM noise reduction and subkilohertz linewidth of an AlGaAs laser by negative electrical feedback

Journal Article · Thu Feb 01 00:00:00 EST 1990 · IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/3.44954· OSTI ID:7168970

Ohtsu, M; Murata, M; Kourogi, M ^[1]

---

1. Graduate School at Nagatsuta, Tokyo Institute of Technology, Midori-ku, Yokohama 227 (JP)

This paper reports on a study in which negative electrical feedback was applied to a CSP-type A1GaAs laser, by which its FM noise was reduced at the Fourier frequency range of f < 40 MHz. The magnitude of the FM noise was far lower than the quantum noise level of the free-running laser at 100Hz < f < 4.4 MHz. Especially, it was low as 1 {times} 10 {sup -7} {sub --} 1 {times} 10 {sup -6} that of the free-running laser at 100 Hz < f < kHz. The full width at half maximum of the field spectrum was reducted to 560 Hz. The major factors necessary for realizing the very low FM noise level were the presently used laser had almost constant FM response characteristics for a wide Fourier frequency range, a high-finesse Fabry-Perot interferometer was employed for highly-sensitive FM noise detection and to get higher feedback gain, the reflection mode of the Fabry-Perot interferometer was employed to increase the bandwidth and efficiency of the FM noise detection, and a computer simulation was utilized for optimum design of the feedback loop.

• OSTI ID: 7168970
• Journal Information: IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (USA), Vol. 26:2; ISSN 0018-9197
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
SEMICONDUCTOR LASERS
NOISE
ALUMINIUM ARSENIDES
COMPUTERIZED SIMULATION
DESIGN
FABRY-PEROT INTERFEROMETER
FEEDBACK
FREQUENCY RANGE
GALLIUM ARSENIDES
QUANTUM EFFICIENCY
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
ARSENIDES
EFFICIENCY
GALLIUM COMPOUNDS
INTERFEROMETERS
LASERS
MEASURING INSTRUMENTS
PNICTIDES
SEMICONDUCTOR DEVICES
SIMULATION
SOLID STATE LASERS
426002* - Engineering- Lasers &amp; Masers- (1990-)
657002 - Theoretical &amp; Mathematical Physics- Classical &amp; Quantum Mechanics
990200 - Mathematics &amp; Computers