A tunable external-cavity diode laser (ECDL) based on a transmission diffraction grating in a Littrow mount has been developed and characterized. A single-transverse-mode diode laser at 650 nm is used in an external-cavity configuration in which the transmission grating is used as a dispersive element to select the single longitudinal mode. The transmission diffraction grating is made with electron-beam lithography. A tunable true single-mode cw output power of >20 mW is obtained from the ECDL. The total wavelength tuning range is 12 nm, and the mode-hop-free continuous tunability is >20 GHz.
© 2002 Optical Society of America
(050.1950) Diffraction and gratings : Diffraction gratings
(140.2020) Lasers and laser optics : Diode lasers
(140.3600) Lasers and laser optics : Lasers, tunable
(300.6260) Spectroscopy : Spectroscopy, diode lasers
Toni Laurila, Timo Joutsenoja, Rolf Hernberg, and Markku Kuittinen, "Tunable External-Cavity Diode Laser at 650 nm Based on a Transmission Diffraction Grating," Appl. Opt. 41, 5632-5637 (2002)