Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film

The development of high performance optically pumped organic lasers operating in the deep blue still remains a big challenge. In this paper, we have investigated the photophysics and the optical gain characteristics of a novel fluorene oligomer functionalized by four triphenylamine (TPA) groups. By ultrafast spectroscopy we found a large gain spectral region from 420 to 500 nm with a maximum gain cross-section of 1.5 × 10−16 cm2 which makes this molecule a good candidate for photonic applications. Amplified Spontaneous Emission measurements (ASE) under 150 fs and 3 ns pump pulses have revealed a narrow emission at 450 nm with a threshold of 5.5 μJcm−2 and 21 μJcm−2 respectively. Our results evidence that this new fluorene molecule is an interesting material for photonic applications, indeed the inclusion of TPA as a lateral substituent leads to a high gain and consequently to a low threshold blue organic ASE.

Karakteristik Gain kaca TZB yang didadah Ion Er3+ untuk penguat pada sistem komunikasi Optik

<p class="JIPIAbstrakKeywords">Paper ini menyajikan karakteristik gain pada kaca tellurite dengan komposisi 55TeO2-2Bi2O3-(43-x)ZnO-xEr2O3 dimana (x=0,5; 1,0; 1,5; 2,0; 2,5; 3,0). Serapan optik kaca diukur mengunakan Ultra Violet-Visible Spectroscopy (UV-Vis) lambda 25. Pengukuran dilakukan pada panjang gelombang 400 nm sampai dengan 1100 nm dengan range 0,1 nm. Pola cross section emisi serta absorbsi kaca didapat dengan menggunakan persamaan McCumber kemudian digunakan untuk menentukan gain cross section. Hasil penelitian menunjukkan bahwa penguatan muncul saat rasio inversi mencapai 0,4 atau lebih karena emisi lebih dominan dan dapat mengimbangi absorbsi. Berdasarkan hasil penelitian urutan tinggi intensitas puncak gain cross section pada berbagai rasio inversi dari tinggi ke rendah adalah x=3.0&gt; x=1.0&gt; x=2.5&gt; x=1.5&gt; x=0.5&gt; x=2.0.</p>

Tunable Optical Gain from Soluble Thiophene-Based Oligomers

ABSTRACTTunable optical gain is demonstrated, through pump and probe measurements, in spin coated neat films of soluble S,S-dioxide oligothiophenes with different functionalization pattern. The molecular functionalization with alkyl and aryl groups allows us to obtain photoluminescence efficiency up to 70%, good chemical stability, high solubility and tunable gain along the visible range from 470 nm to 660 nm. The gain cross section is up to 9*10-18 cm2. The gain relaxation dynamic is studied through time resolved pump and probe measurements. A comparison with some of the best organic materials for laser application is presented. From these results we conclude that thienyl-S,S-dioxide oligothiophenes are interesting materials for applications to organic lasers and amplifiers.