Frequency-locking and threshold current-lowering effects of a quantum cascade laser and an application in gas detection field<xref ref-type="fn" rid="cpb141381fn1">*</xref>

Frequency-locking and threshold current-lowering effects of a quantum cascade laser and an application in gas detection field*

Chen Wei-Gen, Wan Fu†, Zou Jing-Xin, Gu Zhao-Liang, Zhou Qu

FL-CEAS spectrum of H₂ (dot) and the fitted Lorentz line-shape (line).