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diff --git a/bibliography.bib b/bibliography.bib
index caa1f32..c0523d3 100644
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+++ b/bibliography.bib
@@ -6573,3 +6573,21 @@ doi = {10.1364/OE.24.027444},
 abstract = {We have demonstrated experimentally a Diode-Pumped Alkali Laser (DPAL) with a Raman resonance induced dip in the center of the gain profile, in order to produce an anomalous dispersion, necessary for making the laser superluminal. Numerical calculations match closely with experimental results, and indicate that the laser is operating superluminally, with the group index far below unity (~0.00526) at the center of the dip. The estimated factor of enhancement in the sensitivity to cavity length perturbation is ~190, approximately equaling the inverse of the group index. This enhancement factor can be made much higher via optimal tuning of parameters. Such a laser has the potential to advance significantly the field of high-precision metrology, with applications such as vibrometry, accelerometry, and rotation sensing.},
 }
 
+@article{sabooni2013prl_linenarrowing_slow_light,
+  title = {Spectral Engineering of Slow Light, Cavity Line Narrowing, and Pulse Compression},
+  author = {Sabooni, Mahmood and Li, Qian and Rippe, Lars and Mohan, R. Krishna and Kr\"oll, Stefan},
+  journal = {Phys. Rev. Lett.},
+  volume = {111},
+  issue = {18},
+  pages = {183602},
+  numpages = {5},
+  year = {2013},
+  month = {Oct},
+  publisher = {American Physical Society},
+  doi = {10.1103/PhysRevLett.111.183602},
+  url = {http://link.aps.org/doi/10.1103/PhysRevLett.111.183602},
+  abstract = {
+	      More than 4 orders of magnitude of cavity-linewidth narrowing in a rare-earth-ion-doped crystal cavity, emanating from strong intracavity dispersion caused by off-resonant interaction with dopant ions, is demonstrated. The dispersion profiles are engineered using optical pumping techniques creating significant semipermanent but reprogrammable changes of the rare-earth absorption profiles. Several cavity modes are shown within the spectral transmission window. Several possible applications of this phenomenon are discussed.
+	      }
+}
+