Abstract
Room-temperature pulsed and continuous-wave (cw) operation of a tunable external cavity (EC) quantum cascade laser (QCL) at an emitting wavelength of \(4.7\,\upmu \hbox {m}\) was presented. The effect of different external cavity lengths and grating angles of the EC–QCL system were analyzed numerically. A wide tuning range greater than \(131\,\hbox {cm}^{-1}\) was obtained in pulsed mode at room temperature. Without the anti-reflection coating procedure, single-mode cw operation with a side-mode suppression ratio (SMSR) above 20 dB and a wide tuning range greater than \(116\, \hbox {cm}^{-1}\) were achieved. Near the center region, SMSR about 30 dB was also realized through designing the external cavity length. Strain-compensation combined with two-phonon resonance in an active region design and the high-reflection coating promised low threshold current density. A record low threshold current density of \(0.901\,\hbox {kA/cm}^{2}\) for an EC–QCL operated in cw mode was realized.
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Bai, Y., Slivken, S., Darvish, S.R., Razeghi, M.: Room temperature continuous wave operation of quantum cascade lasers with 12.5% wall plug efficiency. Appl. Phys. Lett. 93, 021103/1–021103/3 (2008)
Bakhirkin, Y.A., Kosterev, A.A., Roller, C., Curl, R.F., Tittel, F.K.: Mid-infrared quantum cascade laser based off-axis integrated cavity output spectroscopy for biogenic nitric oxide detection. Appl. Opt. 43, 2257–2266 (2004)
Dougakiuchi, T., Fujita, K., Akikusa, N., Sugiyama, A., Edamura, T., Yamanishi, M.: Broadband tuning of external cavity dual-upper-state quantum-cascade lasers in continuous wave operation. Appl. Phys. Express 4, 102101/1–102101/3 (2011)
Faist, J., Capasso, F., Sicvo, D.L., Sirtori, C., Hutchinson, A.L., Cho, A.Y.: Quantum cascade laser. Science 264, 553–556 (1994)
Faist, J., Capasso, F., Sirtori, C., Sivco, D.L., Hutchinson, A.L., Cho, A.Y.: Vertical transition quantum cascade laser with Bragg confined excited state. Appl. Phys. Lett. 66, 538–540 (1995)
Faist, J., Gmachl, C., Capasso, F., Sirtori, C., Sivco, D.L., Baillargeon, J.N., Cho, A.Y.: Distributed feedback quantum cascade lasers. Appl. Phys. Lett. 70, 2670–2673 (1997)
Fiddler, M.N., Begashaw, I., Mickens, M.A., Collingwood, M.S., Assefa, Z., Bililign, S.: Laser Spectroscopy for Atmospheric and Environmental Sensing. Sensors 9, 10447–10512 (2009)
Hugi, A., Terazzi, R., Bonetti, Y., Wittmann, A., Fischer, M., Beck, M., Faist, J., Gini, E.: External cavity quantum cascade laser tunable from 7.6 to \(11.4\mu \text{ m }\). Appl. Phys. Lett. 95, 061103/1–061103/3 (2009)
Kosterev, A., Wysocki, G., Bakhirkin, Y., So, S., Lewicki, R., Fraser, M., Tittel, F., Curl, R.F.: Application of quantum cascade lasers to trace gas analysis. Appl. Phys. B 90, 165–176 (2008)
Lang, N., Ropcke, J., Wege, S., Steinbach, A.: In situ diagnostic of etch plasmas for process control using quantum cascade laser absorption spectroscopy. Eur. Phys. J. Appl. Phys. 49, 13110/1–13110/3 (2010)
Liu, F.Q., Li, L., Wang, L.J., Liu, J.Q., Zhang, W., Zhang, Q.D., Liu, W.F., Lu, Q.Y., Wang, Z.G.: Solid source MBE growth of quantum cascade lasers. Appl. Phys. A 97, 527–532 (2009)
Lu, Q.Y., Bai, Y., Bandyopadhyay, N., Slivken, S., Razeghi, M.: Room-temperature continuous wave operation of distributed feedback quantum cascade lasers with watt-level power output. Appl. Phys. Lett. 97, 231119/1–231119/3 (2010)
Luo, G.P., Peng, C., Le, H.Q., Pei, S.S., Hwang, W.Y., Ishaug, B.E., Um, J., Baillargeon, J.N., Lin, C.H.: Grating-tuned external-cavity quantum-cascade semiconductor lasers. Appl. Phys. Lett. 78, 2834–2836 (2001)
Lyakh, A., Maulini, R., Tsekoun, A.G., Patel, C.K.N.: Progress in high-performance quantum cascade lasers. Opt. Eng. 49, 111105/1–111105/8 (2010)
Marchenko, D., Mandon, J., Cristescu, S.M., Merkus, P.J.F.M., Harren, F.J.M.: Quantum cascade laser-based sensor for detection of exhaled and biogenic nitric oxide. Appl. Phys. B (2013, online)
Maulini, R., Dunayevskiy, I., Lyakh, A., Tsekoun, A., Patel, C.K.N., Diehl, L., Pflugl, C., Capasso, F.: Widely tunable high-power external cavity quantum cascade laser operating in continuous-wave at room temperature. Electron. Lett. 45, 107–108 (2009)
Mohan, A., Wittmann, A., Hugi, A., Blaser, S., Giovannini, M., Faist, J.: Room-temperature continuous-wave operation of an external-cavity quantum cascade laser. Opt. Lett. 32, 2792–2794 (2007)
Pushkarsky, M., Weida, M., Day, T., Arnone, D., Pritchett, R., Caffey, D., Crivello, S.: High-power tunable external cavity quantum cascade laser in the 5–11 micron regime. Proc. SPIE 6871, 68711X/1–68711X/8 (2008)
Wittmann, A., Bonetti, Y., Fischer, M., Faist, J., Blaser, S., Gini, E.: Distributed-feedback quantum cascade lasers at 9 m operating in continuous wave up to 423 K. IEEE Photonics Technol. Lett. 21, 814–816 (2009)
Wysocki, G., Curl, R.F., Tittel, F.K., Maulini, R., Bulliard, J.M., Faist, J.: Widely tunable mode-hop free external cavity quantum cascade laser for high resolution spectroscopic applications. Appl. Phys. B 81, 769–777 (2005)
Yamanishi, M., Edamura, T., Fujita, K., Akikusa, N., Kan, H.: Theory of the intrinsic linewidth of quantum-cascade lasers: hidden reason for the narrow linewidth and line-broadening by thermal photons. IEEE J. Quantum Electron. 44, 12–29 (2008)
Yao, Y., Wang, X., Fan, J.Y., Gmachl, C.F.: High performance “continuum-to-continuum” quantum cascade lasers with a broad gain bandwidth of over \(400 \text{ cm }^{-1}\). Appl. Phys. Lett. 97, 081115/1–081115/3 (2010)
Zhang, J.C., Liu, F.Q., Tan, S., Yao, D.Y., Wang, L.J., Li, L., Liu, J.Q., Wang, Z.G.: High-performance uncooled distributed-feedback quantum cascade laser without lateral regrowth. Appl. Phys. Lett. 100, 112105/1–112105/4 (2012)
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This work was supported by the National Basic Research Program of China (Grant Nos. 2013CB632803 and 2013CB632801), National Natural Science Foundation of China (Grant No. 61274094), National Scientific Instrument Developing Project of China (2011YQ13001802-04).
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Tan, S., Zhang, J.C., Zhuo, N. et al. Low-threshold, high SMSR tunable external cavity quantum cascade laser around \(4.7\,\upmu \hbox {m}\) . Opt Quant Electron 45, 1147–1155 (2013). https://doi.org/10.1007/s11082-013-9731-z
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DOI: https://doi.org/10.1007/s11082-013-9731-z