Resonator to Laser Cavity Decoupling Interface for Chemical Oxygen Iodine Laser

A. K. Varshney; Rajeev Kr. Dohare; Gaurav Singhal; Mainuddin Dr

doi:10.14429/dsj.69.12976

A. K. Varshney DRDO-Laser Science and Technology Centre, Delhi - 110 054
Rajeev Kr. Dohare DRDO-Laser Science and Technology Centre, Delhi - 110 054
Gaurav Singhal DRDO-Laser Science and Technology Centre, Delhi - 110 054
Mainuddin Dr Department of Electronics and Communication Engineering, Jamia Millia Islamia, New Delhi - 110 025

DOI: https://doi.org/10.14429/dsj.69.12976

Keywords: COIL, Laser cavity, Resonator, Decoupling, Isolation

Abstract

In the present work, the conventional chemical oxygen iodine laser (COIL) source has been technologically upgraded and successfully tested after implementation of decoupling interface between laser cavity and resonator. In the technique, anti-reflection coated fused silica windows mounted in suitable mechanical assemblies are placed between resonator mirrors and laser cavity in such a way that the generated laser beam is out coupled through the resonator during the laser operation. The implemented decoupling assemblies isolate the caustic environment produced in low pressure laser cavity from that of resonator mirrors. Thus requirement of using isolation valves and cavity limbs between laser cavity and resonator as in conventional COIL source is eliminated. Such decoupling mechanism therefore effectively reduces the number of associated components as well as overall length of the laser source which in turn further reduces the overall weight of the laser making it suitable for use onto a mobile platform. Moreover the technique provides accrued benefits in terms of reduction in readiness time and checking of optical alignment of the laser source at will in practical operation scenarios.

Author Biographies

A. K. Varshney, DRDO-Laser Science and Technology Centre, Delhi - 110 054

Mr A.K. Varshney received his MTech (Laser Technology) from Devi Ahilya University, Indore, in 1999. Currently, he is working as a Scientist at DRDO-Laser Science and Technology Centre, Delhi, India. His area of research includes : Integrated optics, microchip lasers and high power lasers specifically chemical oxygen iodine laser.

Rajeev Kr. Dohare, DRDO-Laser Science and Technology Centre, Delhi - 110 054

Mr Rajeev Kr Dohare obtained his MTech (Electronics & Communication Engineering) from Amity University, Noida, in 2013. Presently, he is working as a Scientist in DRDO-Laser Science and Technology Centre, Delhi, India. His field of interest includes data acquisition and control/ electronics/high power lasers.

Gaurav Singhal, DRDO-Laser Science and Technology Centre, Delhi - 110 054

Dr Gaurav Singhal received BE (Mechanical Engineering) from JMI, New Delhi, in 1998 and PhD from IIT, Delhi, in 2008. Presently, he is working as a Scientist in DRDO-Laser Science and Technology Centre, Delhi. His research interests include : High power lasers, high speed unsteady flows, turbulent mixing, laser diagnostics, CFD techniques etc.

Mainuddin Dr, Department of Electronics and Communication Engineering, Jamia Millia Islamia, New Delhi - 110 025

Dr Mainuddin received his ME from Delhi College of Engineering, Delhi, in 2003 and PhD in 2008 from JMI, New Delhi. He is presently working as a Professor in Department of Electronics & Communication Engineering, JMI, New Delhi. His research interests include : Optical diagnostics, high power lasers, data communication, optical communication and computer networks.

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