Demonstration of low-frequency intensity noise reduction for fiber sensors powered by diode-pumped Nd-YAG lasers

Author

Dagenais, D.M. ; Koo, K.P. ; Dandridge, A.

Author_Institution

SFA Inc., Landover, MD, USA

Volume

4

Issue

5

fYear

1992

fDate

5/1/1992 12:00:00 AM

Firstpage

519

Lastpage

520

Abstract

Diode-pumped Nd-YAG lasers are being used in fiber sensors for their frequency stability which alleviates the requirements on interferometer path balancing associated with semiconductor lasers. Unfortunately, low-frequency intensity fluctuations induced by the broad-area laser pump, as well as noise associated with launching light into a single-mode fiber, can limit the sensor´s minimum detectability. The authors measured the low-frequency relative intensity noise (RIN) of these lasers, implemented feedback into an external modulator to compensate for both laser and launching noise, and reduced the RIN to -100 dB/ square root Hz at 1 Hz.<>

Keywords

feedback; fibre optic sensors; fluctuations; neodymium; noise; optical modulation; optical pumping; solid lasers; 1 Hz; YAG:Nd; YAl5O12:Nd; broad-area laser pump; diode-pumped Nd-YAG lasers; external modulator; feedback; fiber sensors; fibre light launching; frequency stability; laser frequency stability; laser noise; launching noise; low-frequency intensity fluctuations; low-frequency intensity noise reduction; low-frequency relative intensity noise; minimum detectability; noise; single-mode fiber; Fiber lasers; Laser feedback; Laser noise; Laser stability; Low-frequency noise; Noise reduction; Optical fiber sensors; Pump lasers; Semiconductor device noise; Semiconductor lasers;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.136507

Filename

136507