Atmospheric N<sub>2</sub>O gas detection based on an inter-band cascade laser around 3.939 µm<xref rid="cpb_29_1_010704fn1" ref-type="fn">*</xref><fn id="cpb_29_1_010704fn1"><label>*</label><p>Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFC021330404, 2017YFC0209703, and 2016TFC0303900).</p></fn>

Atmospheric N₂O gas detection based on an inter-band cascade laser around 3.939 µm**

Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFC021330404, 2017YFC0209703, and 2016TFC0303900).

Sun Chun-Yan^{1, 2, 3}, Cao Yuan^{1, 2}, Chen Jia-Jin¹, Wang Jing-Jing^{1, 2}, Cheng Gang^{1, 2}, Wang Gui-Shi^{1, †}, Gao Xiao-Ming¹

Schematic diagram of the LabVIEW-based software lock-in amplifier.