The feedback element is a device that reflects some of the laser light back into the cavity, causing the laser to oscillate. The external cavity is a length of optical material that surrounds the diode and is responsible for shaping the laser beam. The diode is responsible for generating the laser beam, and it is typically made of a semiconductor material such as gallium arsenide. This reflected light is then amplified by the diode and continues to bounce back and forth between the diode and the mirror, creating a stable, continuous-wave laser beam. The external cavity is created by placing a partially reflective mirror at the end of the diode, which reflects a portion of the laser beam back into the diode. These lasers are characterized by their high efficiency and low cost, making them popular for many applications including telecommunications, spectroscopy, and laser printing.ĮCDLs are made up of three main components: the diode, the external cavity, and the feedback element. Lett.External cavity diode lasers (ECDLs) are a type of laser that use a diode as the light-emitting element. Zhao, Y., Li, Y., Wang, Q., Meng, F., Lin, Y., Wang, S., Lin, B., Cao, S., Cao, J., Fang, Z., Li, T., Zang, E.: 100-Hz linewidth diode laser with external optical feedback. quency selective optical feedback from a diffraction grating in a Littrow. Zhao, Y.T., Zhao, J.M., Huang, T., Xiao, L.T., Jia, S.T.: Frequency stabilization of an external-cavity diode laser with a thin Cs vapour cell. External cavity diode lasers are used increasingly as sources of light in. Wynands, R., Nagel, A.: Precision spectroscopy with coherent dark states. Vitiello, M.S., Consolino, L., Bartalini, S., Taschin, A., Tredicucci, A., Inguscio, M., De Natale, P.: Quantum-limited frequency fluctuations in a terahertz laser. Vassen, W., Zimmermann, C., Kallenbach, R., Hänsch, T.W.: A frequency-stabilized titanium sapphire laser for high-resolution spectroscopy. Tombez, S.Schilt, Di Francesco, J., Führer, T., Rein, B., Walther, T., Di Domenico, G., Hofstetter, D., Thomann, P.: Linewidth of a quantum cascade laser assessed from its frequency noise spectrum and impact of the current driver. Schilt, S., Bucalovic, N., Tombez, L., Dolgovskiy, V., Schori, C., Di Domenico, G., Zaffalon, M., Thomann, P.: Frequency discriminators for the characterization of narrow-spectrum heterodyne beat signals: application to the measurement of a sub-hertz carrier-envelope-offset beat in an optical frequency comb. Schawlow, A.L., Townes, C.H.: Infrared and optical masers. Paboeuf, D., Schlosser, Peter J., Hastie, Jennifer E.: Frequency stabilization of an ultraviolet semiconductor disk laser. Myers, T.L., Williams, R.M., Taubman, M.S., Gmachl, C., Capasso, F., Sivco, D.L., Baillargeon, J.N., Cho, A.Y.: Free-running frequency stability of mid-infrared quantum cascade lasers. Kaspar, S., Rosener, B., Rattunde, M., Topper, T., Manz, C., Kohler, K., Ambacher, O., Wagner, J.: Sub-MHz-linewidth 200-mW actively stabilized 2.3 μm semiconductor disk laser. Kasevich, M., Chu, S.: Atomic interferometry using stimulated Raman transitions. Hirata, S., Akatsuka, T., Ohtake, Y., Morinaga, A.: Sub-hertz-linewidth diode laser stabilized to an ultralow-drift high-finesse optical cavity. Henry, C.H.: Theory of the linewidth of semiconductor lasers. Galzerano, G., Gambetta, A., Fasci, E., Castrillo, A., Marangoni, M., Laporta, P., Gianfrani, L.: Absolute frequency measurement of a water-stabilized diode laser at 1.384 μm by means of a fiber frequency comb. Abstract The external-cavity diode laser is advantageous in terms of low noise, high side-mode suppres- sion ratio, high temperature stability, simple structure, and low cost, which has been the preferred scheme to realize wide-tuning and narrow-linewidth characteristics. 32, 3817–3823 (2014)Įlliott, D.S., Roy, Rajarshi, Smith, S.J.: Extracavity laser band-shape and bandwidth modification. 15, 1523–1527 (2005)ĭumont, P., Camargo, F., Danet, J., Holleville, D., Guerandel, S., Pillet, G., Baili, G., Morvan, L., Dolfi, D., Gozhyk, I., Beaudoin, G., Sagnes, I., Georges, P., Lucas-Leclin, G.: Low-noise dual-frequency laser for compact Cs atomic clocks. 41, 1019–1025 (2009)īorisov, P.A., Melentiev, P.N., Rudnev, S.N., Balykin, V.I.: Simple system for active frequency stabilization of a diode laser in an external cavity. 104, 083904-1–083904-4 (2010)īayrakli, I., et al.: Grating-coupled external-cavity short-wavelength InGaAs/InAlAs/AlAs quantum-cascade lasers. 104, 040503-1–040503-4 (2010)īartalini, S., Borri, S., Cancio, P., Castrillo, A., Galli, I., Giusfredi, G., Mazzotti, D., Gianfrani, L., De Natale, P.: Observing the intrinsic linewidth of a quantum-cascade laser: beyond the schawlow-townes limit. Afzelius, M., Usmani, I., Amari, A., Lauritzen, B., Walther, A., Simon, C., Sangouard, N., Minar, J., de Riedmatten, H., Gisin, N., Kroll, S.: Demonstration of atomic frequency comb memory for light with spin-wave storage.
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