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 proposed method for frequency locking. (a) Wavelength shift between the refer signal and real signal. (b) The process of calculating the peak shift, the inset is the result of correlation coefficient.