Huanqian Loh,1
Yu-Ju Lin,1
Igor Teper,1
Marko Cetina,1
Jonathan Simon,2
James K. Thompson,1
and Vladan Vuletić1
1H. Loh (huanqian@alum.mit.edu), Y.-J. Lin, I. Teper, M. Cetina, J. K. Thompson, and V. Vuletić are with the Department of Physics, MIT–Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.
2J. Simon is with the Department of Physics, MIT–Harvard Center for Ultracold Atoms, Harvard University, Cambridge, Massachusetts 02138.
Huanqian Loh, Yu-Ju Lin, Igor Teper, Marko Cetina, Jonathan Simon, James K. Thompson, and Vladan Vuletić, "Influence of grating parameters on the linewidths of external-cavity diode lasers," Appl. Opt. 45, 9191-9197 (2006)
We investigate experimentally the influence of the grating reflectivity, grating resolution, and diode facet antireflection (AR) coating on the intrinsic linewidth of an external-cavity diode laser built with a diffraction grating in a Littrow configuration. Grating lasers at 399, 780, and
are determined to have typical linewidths between 250 and
from measurements of their frequency noise power spectral densities. The linewidths are little affected by the presence of an AR coating on the diode facet but narrow as the grating reflectivity and grating resolution are increased, with the resolution exerting a greater effect. We also use frequency noise measurements to characterize a laser mount with improved mechanical stability.
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Linewidths of AR-coated 852 nm lasers built with gratings 43773, 43753, 43222 from Edmund Optics for lines 1–3. For a Littrow grating laser, the first diffraction order with power reflectivity is reflected back into the laser for optical feedback, while the zeroth order with power reflectivity is used as the laser output. The grating resolution is computed for a beam diameter of from the groove density n and the Littrow angle. The free-running laser linewidth is estimated to be (Ref. [28]). lists different theoretical predictions for the given laser parameters, and is the linewidth measured using Eq. (1). . , where A and B are calculated from Eq. (26) of Kazarinov and Henry (Ref. [12]).
Calculated from Eq. (8) of the paper of Sun et al. (Ref. [10]).
Table 2
Linewidths of Both Non-AR- and AR-Coated 780 nm Lasersa
Linewidths of lasers without and with an AR coating on the diode front facet, assembled with the same grating (Edmund Optics 43773). is the diode chip length, while and are the back and front facet power reflectivities, respectively. and are as defined in Table 1.
Reference 28.
Δνth = Δν0∕(1 + A + B)2, where A and B are calculated from Eq. (26) of Kazarinov and Henry’s paper (Ref. [12]12).
Calculated from Eq. (8) of the paper of Sun et al. (Ref. [10]10).
The calculations of Sun et al. do not apply for (Ref. [10]10).
Linewidths of AR-coated 852 nm lasers built with gratings 43773, 43753, 43222 from Edmund Optics for lines 1–3. For a Littrow grating laser, the first diffraction order with power reflectivity is reflected back into the laser for optical feedback, while the zeroth order with power reflectivity is used as the laser output. The grating resolution is computed for a beam diameter of from the groove density n and the Littrow angle. The free-running laser linewidth is estimated to be (Ref. [28]). lists different theoretical predictions for the given laser parameters, and is the linewidth measured using Eq. (1). . , where A and B are calculated from Eq. (26) of Kazarinov and Henry (Ref. [12]).
Calculated from Eq. (8) of the paper of Sun et al. (Ref. [10]).
Table 2
Linewidths of Both Non-AR- and AR-Coated 780 nm Lasersa
Linewidths of lasers without and with an AR coating on the diode front facet, assembled with the same grating (Edmund Optics 43773). is the diode chip length, while and are the back and front facet power reflectivities, respectively. and are as defined in Table 1.
Reference 28.
Δνth = Δν0∕(1 + A + B)2, where A and B are calculated from Eq. (26) of Kazarinov and Henry’s paper (Ref. [12]12).
Calculated from Eq. (8) of the paper of Sun et al. (Ref. [10]10).
The calculations of Sun et al. do not apply for (Ref. [10]10).
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