Demonstration of High-Power and Stable Single-Mode in a Quantum Cascade Laser Using Buried Sampled Grating

Abstract

High-power, low-threshold stable single-mode operation buried distributed feedback quantum cascade laser by incorporating sampled grating emitting at λ ~ 4.87 μm is demonstrated. The high continuous wave (CW) output power of 948 mW and 649 mW for a 6-mm and 4-mm cavity length is obtained at 20 °C, respectively, which benefits from the optimized optical field distribution of sampled grating. The single-mode yields of the devices are obviously enhanced by controlling cleaved positions of the two end facets precisely. As a result, stable single-mode emission and mode tuning linearly without any mode hopping of devices are obtained under the different heat sink temperatures or high injection currents.

Mid-infrared optical parametric oscillation spanning 3.4–8.2 μm in a MgF2 microresonator

“…Generally, the QCL can provide a practical and miniaturized platform for broadband MIR laser generation with longer wavelength (beyond 4.5 μm) and near diffraction-limited beam quality [34,35], which is convenient for further integration with crystalline microresonators benefited from better wavelength matching and easier light coupling. In our experiment, the utilized QCL module is centred at ∼4.78 μm as shown in figure 5(a).…”

Design and Fabrication of Silicon-Blazed Gratings for Near-Infrared Scanning Grating Micromirror

“…Diffraction gratings are widely used as core optical splitters in modern optical devices such as ultra-precision measurement systems [ 1 , 2 ], spectrometers [ 3 , 4 , 5 , 6 ], semiconductor lasers [ 7 , 8 ], display techniques [ 9 , 10 ], and so on. With the development of micro-electro-mechanical system (MEMS) technology, there are kinds of silicon diffraction gratings developed, including rectangle gratings, sine gratings, and blazed gratings.…”

A review on fabrication of blazed gratings

“…Blazed diffraction gratings exhibit excellent optical characteristics, which can be attributed to the maximised diffraction efficiency at the blazed angle of the working facet. Blazed gratings are widely used in ultra-precision measurement systems [8,9], spectrometers [10][11][12][13][14][15], semiconductor lasers [16][17][18], display techniques [19][20][21][22], and other schemes within technical fields. As the key component of the micro-spectrometer, the resolution of the spectrometer depends on the characteristics of the blazed gratings [23].…”