Varun Singh

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Education / Work History

• Researcher, IIT Madras
• M.Tech, Center for Lasers and Photonics (CELP), IIT Kanpur (2008-2010)

Thesis Abstract

Electronically Synchronizing High Repetition Rate Femtosecond Lasers for Spectroscopic Applications

With the help of ultrafast mode locked femtosecond lasers it has become possible to probe molecular dynamics and image microscopic objects very effectively but when the frequency domain pulse shaping using AOM (acousto optic modulator) is combined with ultrafast laser pulse phenomenon it makes the process of probing molecular dynamics and microscopic imaging more effective. In many cases the synchronization of ultrafast mode locked laser is desirable in order to make sure that the desired pulse shape is incident on the sample under study at precisely the time when a particular molecular process, which is to be probed is taking place. In my thesis work I have designed the assembly of circuits which can synchronize the ultrafast mode locked laser to a frequency synthesizer, also an amplifier circuit for amplifying the laser pulses electronically for synchronization has been designed. The principal of operation and construction of the circuits have been explained in detail in this work and I have also written a code in MATLAB which helps in designing the phase locking circuit by accurately predicting whether the circuit will be stable or not and it can also calculate various control system parameters related to the circuit.

Research Topic / Interest

Contact me to know my current interests.