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Hi Folks,
I am new to this forum and just saw this posts which now dates a little.

I was a visiting student in the optics lab at Sydney University in 1998 or so and had the chance to meet and work a bit with Hariharan on achromatic phase shifting based on polarization tweeking (Pointcarré sphere). What an inspiring person he was!

I look forward to meeting you all on this forum in the near future

Loic

While at 89, it's not a great surprise, nevertheless, I think one of the giants of holography has passed.To me, his book is one of the Triumvirate of Holography Books - The Triple Bible of Holography (along with the books by Collier and Solymar). His derivations in the book have a simplicity to them that really made me understand phase relationships when I first read it about 1982.

Around 2003 I was at an SPIE meeting and having a drink in the food area when I heard someone behind me talk about the quantum effects of four interacting electrons - a double, double slit experiment. As a former theoretical physicists, this was an interesting overheard conversation, so I turned around to ask the person some questions about his thesis. To my surprise, it was Hariharan! He told me he was studying four-wave-mixing with electrons instead of photons. We had a fairly interesting conversation for a while. When he launched the Journal of Holography and Speckle, I was honoured to be asked by Hariharan to be an early reviewer.

Parameswaran Hariharan died on July 26, 2015 at the age of 89. Hariharan was an established expert in holography and interferometry.

http://spie.org/x114988.xml