Pattern formation in transparent media using ultrashort laser pulses

Thomas, John and Alti, Kamlesh and Dharmadhikari, JA and Santhosh, Chidangil and Mathur, D (2013) Pattern formation in transparent media using ultrashort laser pulses. Optics Communications, 304 (1). pp. 29-38. ISSN 0030-4018

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We report results of a systematic study of the morphology of laser-written structures within transparent media like fused silica, borosilicate glass (BK7), and polymethylmethylacrylate (PMMA) using a high-energy, 5.1 MHz repetition rate, femtosecond laser oscillator. Depending on experimental conditions, both smooth channels as well as dot patterns can be laser-written. The periodicity of the written dots is readily controlled by the energy dose, a single parameter that encompasses laser energy, translation speed at fixed repetition rate, and focusing conditions. We discover the importance of the direction in which laser-writing is carried out: the periodicity of the dot patterns written at fixed energy dose but with opposite writing directions is significantly different. In PMMA, extremely large rod-like structures (∼200 µm) are observed whose formation is also dependent on writing direction. We quantify guidance of 632 nm and 830 nm light in structures written in BK7.

Item Type: Article
Uncontrolled Keywords: Laser writing; Femtosecond phenomena; Ultrafast processes.
Subjects: Departments at MU > Atomic Molecular Physics
Depositing User: KMC Manipal
Date Deposited: 15 Jul 2014 04:31
Last Modified: 15 Jul 2014 04:31

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