Corrugated neat thin-film conjugated polymer distributed-feedback lasers

被引:66
作者
Holzer, W
Penzkofer, A
Pertsch, T
Danz, N
Bräuer, A
Kley, EB
Tillmann, H
Bader, C
Hörhold, HH
机构
[1] Univ Regensburg, Inst Expt & Angew Phys 2, D-93053 Regensburg, Germany
[2] Fraunhofer Inst Angew Opt & Feinmech Jena, D-07743 Jena, Germany
[3] Univ Jena, Inst Angew Phys, D-07743 Jena, Germany
[4] Univ Jena, Inst Organ Chem & Makromol Chem, D-07743 Jena, Germany
来源
APPLIED PHYSICS B-LASERS AND OPTICS | 2002年 / 74卷 / 4-5期
关键词
D O I
10.1007/s003400200821
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Wave-guided thin-film distributed-feedback (DFB) polymer lasers are fabricated by spin coating a PPV-derived semiconducting polymer, thianthrene-DOO-PPV, onto oxidised silicon wafers with corrugated second-order periodic gratings. The gratings are written by reactive ion beam etching. Laser action is achieved by transverse pumping with picosecond laser pulses (wavelength 347.15 nm, duration 35 ps). The DFB-laser surface emission and edge emission are analysed. Outside the grating region the polymer film is used for comparative wave-guided travelling wave laser (amplified spontaneous emission (ASE)) studies. The pump pulse threshold energy density for wave-guided DFB-laser action (4-9 muJ cm(-2)) is found to be approximately a factor of two lower than the threshold for wave-guided travelling wave laser action. The spectral width of the DFB laser (down to Deltalambda(DFB) approximate to 0.07 nm) is considerably narrower than that of the travelling wave laser (Deltalambda(TWL) approximate to 14 nm). The DFB-laser emission is highly linearly polarised transverse to the grating axis (TE mode). Only at high pump pulse energy densities does an additional weak TM mode build up. The surface-emitted DFB-laser radiation has a low divergence along the grating direction. For both the DFB lasers and the travelling wave lasers, gain saturation occurs at high excitation energy densities.
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页码:333 / 342
页数:10
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