Properties of diode lasers with intensity noise control

A. Dandridge; A. B. Tveten

doi:10.1364/AO.22.000310

Applied Optics
Vol. 22,
Issue 2,
pp. 310-312
(1983)
•https://doi.org/10.1364/AO.22.000310

Properties of diode lasers with intensity noise control

A. Dandridge and A. B. Tveten

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A. Dandridge and A. B. Tveten, "Properties of diode lasers with intensity noise control," Appl. Opt. 22, 310-312 (1983)

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Abstract

The effect of the reduction of intensity noise by electronic feedback on the frequency stability of a GaAlAs laser is investigated. Only a small increase (~30%) in stability was observed because the intensity and frequency noise were found to be not completely correlated. The technique described can also be used to estimate the coherence function γ² between the various noise properties of the laser’s emission without using a correlator.

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Case	Laser parameter	dI_F	dI_R	dF	Reduction of
Case	Laser parameter	dI_F	dI_R	dF	dI_F	dI_R	dF
(a)	Without feedback	−121	−121.5	−82.5	—	—	—
(b)	Feedback from dI_F	−143	−130.2	−82	−22	−8.7	+0.5
(c)	Feedback from dI_R	−130	−142	−86	−9	−20.5	−3.5
(d)	Feedback from dF	−122	−122	−111.5	−1	−0.5	−29

Feedback noise reductions (dB)	f	γ²
0.0	1.00	0.25
−0.5	0.94	0.31
−1.0	0.89	0.36
−1.5	0.84	0.42
−2.0	0.79	0.47
−2.5	0.74	0.52
−3.0	0.71	0.56
−4.0	0.63	0.64
−5.0	0.56	0.71
−6.0	0.50	0.76
−7.0	0.45	0.81
−8.0	0.40	0.84
−9.0	0.35	0.88
−10.0	0.32	0.90

Case	Laser parameter	dI_F	dI_R	dF	Reduction of
Case	Laser parameter	dI_F	dI_R	dF	dI_F	dI_R	dF
(a)	Without feedback	−121	−121.5	−82.5	—	—	—
(b)	Feedback from dI_F	−143	−130.2	−82	−22	−8.7	+0.5
(c)	Feedback from dI_R	−130	−142	−86	−9	−20.5	−3.5
(d)	Feedback from dF	−122	−122	−111.5	−1	−0.5	−29

Feedback noise reductions (dB)	f	γ²
0.0	1.00	0.25
−0.5	0.94	0.31
−1.0	0.89	0.36
−1.5	0.84	0.42
−2.0	0.79	0.47
−2.5	0.74	0.52
−3.0	0.71	0.56
−4.0	0.63	0.64
−5.0	0.56	0.71
−6.0	0.50	0.76
−7.0	0.45	0.81
−8.0	0.40	0.84
−9.0	0.35	0.88
−10.0	0.32	0.90

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Applied Optics