2015
DOI: 10.1364/oe.23.009573
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Accurate measurement of the residual birefringence in VECSEL: Towards understanding of the polarization behavior under spin-polarized pumping

Abstract: In this paper we report birefringence measurements of an optically pumped (100)-oriented InGaAs/GaAsP multiple quantum well (MQWs) Vertical External Cavity Surface Emitting Laser (VECSEL) in oscillating conditions. The proposed technique relies on the measurement in the microwave domain of the beatnote between the oscillating mode and the amplified spontaneous emission of the cross-polarized non-lasing field lying in the following longitudinal mode. This technique is shown to offer extremely high sensitivity a… Show more

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Cited by 26 publications
(30 citation statements)
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“…This is similar to spin amplification of the pump, but requires much lower input power, demonstrating a potential application for regeneration of circularly polarised signals in future telecommunications systems. Furthermore, reduced birefringence ( figure 6b, 9), which is feasible considering recent developments [35], [38]- [43] would give a very high output ellipticity for any input ellipticity or ψ inj , creating a signal spin regenerator robust to the input polarisation state. Metamaterials [44]- [46], or other exotic materials such as chiral conjugated polymer films [47] have recently been investigated which can generate elliptic from linear polarisation.…”
Section: Discussion and Future Workmentioning
confidence: 99%
See 1 more Smart Citation
“…This is similar to spin amplification of the pump, but requires much lower input power, demonstrating a potential application for regeneration of circularly polarised signals in future telecommunications systems. Furthermore, reduced birefringence ( figure 6b, 9), which is feasible considering recent developments [35], [38]- [43] would give a very high output ellipticity for any input ellipticity or ψ inj , creating a signal spin regenerator robust to the input polarisation state. Metamaterials [44]- [46], or other exotic materials such as chiral conjugated polymer films [47] have recently been investigated which can generate elliptic from linear polarisation.…”
Section: Discussion and Future Workmentioning
confidence: 99%
“…Despite the flexibility that the SFM sign convention gives for the absolute signs of γ a and γ p depending on orientation, the relative signs of γ a and γ p are physically significant, as the spin VCSEL system will display very different behaviour with higher gain and frequency in the same axis than in different axes, as shown above. Both signed [35] and absolute [38] frequency differences between the orthogonal [110] and 110 crystalographic axes for QW spin-VCSELs have been recently published. In [34] both negative and positive frequency splitting between [110] and [110] was seen, and in each case the gain splitting was of opposite sign to the frequency splitting.…”
Section: A Solitary Spin Vcselmentioning
confidence: 99%
“…1(b)). Their usually weak coupling results in an unstable behavior with polarization switching and PO, extensively studied and attributed to residual birefringence which is considered detrimental in both conventional and spin-lasers [4,19]. In contrast, we aim to enhance the birefringence due to its connection to the PO frequency, which is related to the beat frequency between the two orthogonal modes and leads to the periodic evolution of the total E=E x +E y (Fig.…”
mentioning
confidence: 99%
“…With an increasing interest in non-nitride III-V wurtzite materials with large spinorbit coupling [73][74][75][76], we expect they could facilitate optically-injected spin lasers at room temperature. While we have focused on spin VCSELs, our approach would also be useful for vertical external cavity surface emitting lasers (VECSELs) [13,14]. They enable depositing a thin-film ferromagnet just 100-200 nm away from the gain region for spin injection at the room temperature.…”
Section: Discussionmentioning
confidence: 99%