added henry citation

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@@ -7602,3 +7602,34 @@ doi = {10.1080/09500340.2016.1148212},
 	url = {https://link.aps.org/doi/10.1103/RevModPhys.87.637}
 }
 
+@article{henry1982ieee,
+	title = {Theory of the Linewidth of Semiconductor Lasers},
+	author = {C. Henry},
+	journal = {IEEE Journal of Quantum Electronics},
+	volume = {18},
+	issue = {2},
+	pages = {259--264},
+	year = {1982},
+	doi = {IEEE Journal of Quantum Electronics},
+	abstract = {A theory of the spectral width of a single-mode
+		semiconductor laser is presented and used to explain the recent
+			measurements of Fleming and Mooradian on AlGaAs lasers.
+			They found the linewidth to be inversely proportional
+			to power and to have a value of 114 MHz at 1 mW per
+			facet. This value is 30 times greater than can be
+			explained by existing theories. The enhanced linewidth
+			is attributed to the variation of the real refractive
+			indexn'with carrier density. Spontaneous emission
+			induces phase and intensity changes in the laser field.
+			The restoration of the laser to its steady-state
+			intensity results in changes in the imaginary part of
+			the refractive index\Delta n". These changes are
+			accompanied by changes in the real part of the
+			refractive index\Delta n', which cause additional phase
+			fluctuations and line broadening. The linewidth
+			enhancement is shown to be1 + \alpha^{2}, where\alpha =
+			\Delta n'/\Delta n". A value of\alpha \approx 5.4,
+		needed to explain the observed linewidth, is close to the
+			experimental values of a of 4.6 and 6.2.}
+}
+