Wavelength stabilized high pulse power laser bars for line-flash automotive LIDAR

Internally wavelength stabilized 910 nm diode lasers with epitaxially stacked multiple active regions and tunnel junctions

“…Indeed, for higher temperatures, the side peak in Figure 7 disappears, because the gain peak wavelength increases more strongly with temperature than the Bragg wavelength. In Figure 8, the temperature-dependent shift of the peak wavelength is determined to be about 0.06 nm/K, which agrees with the corresponding value obtained for a DBR laser with a single active region having the same cavity length and stripe width [10]. It is much smaller than the corresponding shift of the gain peak determining the lasing wavelength of a FP laser (0.3-0.4 nm/K in the 9xx nm wavelength range) [11].…”

Wavelength‐stabilized ns‐pulsed 2.2 kW diode laser bar with multiple active regions and tunnel junctions

“…is shown in Figure 3 for the DBR laser bar with three active region studied in this Letter and for a conventional DBR laser bar having only a single active region reported earlier in ref. [4,11]. The dependence of the power on the current of the three-active region laser bar is nearly linear for both investigated mount temperatures and a maximum pulse power of more than 2.2 kW is achieved for pulse currents of 1130 A and 1150 A at 25 • C and 45 • C, respectively.…”

“…The laser bar is soldered p-side down on a copper tungsten (CuW) submount. For measurement, that assembly is then sandwiched between an aluminum base and a tailored high pulse current electronic driver with low inductances that was originally developed for single-active region laser bars [11], see Figure 1. Thus, all 48 emitters are driven in parallel.…”

“…This necessitates emission in a narrow spectral range that is stable in a large temperature range. Integration of a surface Bragg grating into the diode laser is a compact and cost-efficient means to stabilize the emission wavelength [10,11]. To successfully implement this concept to diode lasers with multiple epitaxially stacked active regions, all active regions must address the same vertical mode to utilize a surface Bragg grating.…”

Epitaxially-Stacked High Efficiency Laser Diodes Near 905 nm

“…IGH-power continuous-wave (CW) and quasicontinuous-wave (QCW) laser diodes (LDs) have been widely employed as pump sources for fiber and solidstate lasers [1,2,3]. Recently, high-power pulsed laser diodes evolved beyond these fields with demands in three-dimensional (3D) sensing and light detection and ranging (LiDAR) applications [4,5,6]. Depending on the method employed and application, the systems involve ~1-100 ns long pulses with peak power levels of 10 to 100 W [6].…”