Injection laser with a waveguide lens

Bogatov, Alexandr P; Vagner, N A; Davydova, Evgeniya I; Eliseev, P G; Kobildzhanov, O A; Nikitina, O.M.; Pak, G T

doi:10.1070/qe1989v019n11abeh009261

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“…These earlier studies of semiconductor and other varieties of laser have apparently not covered the results reported in the present paper. Measurements of the noise spectra in the vicinity of the longitudinal modes adjacent to the lasing modes of semiconductor lasers [16,17] have been interpreted [17] in terms of the theory for the gain presented here; this has appeared previously along with other aspects of our work in brief papers [7,18,19]. Figure 1 shows the relevant part of the longitudinalmode structure, with a lasing mode of frequency coL and the adjacent modes at separation 5 on either side.…”

Section: Introductionmentioning

confidence: 82%

Gain and noise in subthreshold longitudinal laser modes

Loudon

Shackleton

Harris³

et al. 1994

Phys. Rev. A

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A theoretical study is presented of the gain profile and noise spectrum in the vicinity of the longitudinal-mode frequency separation of a single-mode laser amplifier of class A or class 8. The gain and the noise are associated with the adjacent subthreshold modes on either side of the lasing mode; coupled equations of motion for these three modes have been solved. The amplitudes of the contributions of each individual subthreshold mode to both the gain and the noise are generally anticorrelated. Thus striking cancellation effects should occur in self-heterodyne measurements from the superposition of these contributions. The theoretical predictions are compared with the results of a parallel experimental study on a single-mode argon-ion laser amplifier. Measurements of the gain profiles and noise spectra close to the longitudinal-mode separation are reported for a range of laser output powers. Results are presented for simultaneous detection of the contributions of the two adjacent modes; for detection of only one adjacent mode, the other being suppressed with a Fabry-Perot etalon; and again for detection of both modes but with their phase relative to the central laser beam modified by a Fabry-Perot phase shifter. The predicted cancellation effects are clearly confirmed, and the gain profiles and noise spectra are in good agreement with the theoretical expressions. The noise-cancellation effect is demonstrated by the generation of an optical "antinoise" beam that is nearly 180' out of phase with respect to a broadband noisy input beam.PACS number(s): 42.60. Lh, 42.60.Mi, 42.79. gx

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Section: Introductionmentioning

confidence: 82%