Optical Absorption at Dark Lines in Degraded Double-Heterostructure Lasers

概要

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The local heating effect at the dark lines in a degraded double-heterostructure laser was investigated under cw lasing operation by measuring the thermal radiation of infrared. The dependence of the temperature rise on current I observed at the dark lines showed an abrupt change at the threshold current I_<th>. Above the threshold the temperature rose more rapidly with increasing current. This abrupt change came from the local heating due to the absorption of the coherent radiation at the dark lines. When operated above the threshold, almost all the radiation was directed along the axis of the cavity. Therefore, the dark lines can absorb radiations emitted at distant non-degraded regions. In the present experiment, the additional temperature rise of 2.4℃ was observed at I=I_<th>±100 mA. The analysis based on a simplified model showed that the absorption coefficient of the dark line was about 170 cm^<-1>.
社団法人応用物理学会の論文
1975-04-05