Abstract: A tunable external cavity laser with dual gain chips, including: a polarization beam splitter having a beam splitting surface arranged at an angle of 45° with respect to a first direction and a second direction perpendicular to the first direction; a first gain chip arranged in the first direction; a second gain chip arranged in the second direction; a feedback cavity arranged in the first direction, wherein the feedback cavity and the first gain chip are respectively arranged on two opposite sides of the polarization beam splitter, and the feedback cavity includes at least one independent Fabry-Perot etalon, at least one air gap Fabry-Perot cavity and a mirror that are arranged in the first direction. The polarization beam splitter and the two gain chips cooperate to share the feedback cavity, so that a wavelength and a phase may be adjusted, and a larger tuning range may be obtained.

Abstract: A tunable external cavity laser with dual gain chips, including: a polarization beam splitter having a beam splitting surface arranged at an angle of 45° with respect to a first direction and a second direction perpendicular to the first direction; a first gain chip arranged in the first direction; a second gain chip arranged in the second direction; a feedback cavity arranged in the first direction, wherein the feedback cavity and the first gain chip are respectively arranged on two opposite sides of the polarization beam splitter, and the feedback cavity includes at least one independent Fabry-Perot etalon, at least one air gap Fabry-Perot cavity and a mirror that are arranged in the first direction. The polarization beam splitter and the two gain chips cooperate to share the feedback cavity, so that a wavelength and a phase may be adjusted, and a larger tuning range may be obtained.

Abstract: A rooftop tent includes a frame and a canopy, a first inlet is provided on the frame, and a side of the canopy is provided with an entrance; and a baseboard, which is inflatable and a second inlet in provided on a side of the baseboard. The frame is inflatable and air is inflated into the frame by the first inlet, such that the canopy is supported. A second inlet is located on the side of the baseboard, and the air is inflated into the baseboard through the second inlet, such that the baseboard is unfolded into a panel, which is used to support and carry the tent body. A receiving apparatus of the rooftop tent is also provided.

Abstract: A rooftop tent includes a frame and a canopy, a first inlet is provided on the frame, and a side of the canopy is provided with an entrance; and a baseboard, which is inflatable and a second inlet in provided on a side of the baseboard. The frame is inflatable and air is inflated into the frame by the first inlet, such that the canopy is supported. A second inlet is located on the side of the baseboard, and the air is inflated into the baseboard through the second inlet, such that the baseboard is unfolded into a panel, which is used to support and carry the tent body. A receiving apparatus of the rooftop tent is also provided.