Laser and Mach-Zehnder interferometry for in-situ monitoring of crystal growth and concentration variation

Yong-Kee Kim; B. Rami Reddy; Ravindra B. Lal

doi:10.1117/12.316447

6 July 1998 Laser and Mach-Zehnder interferometry for in-situ monitoring of crystal growth and concentration variation

Yong-Kee Kim, B. Rami Reddy, Ravindra B. Lal

Proceedings Volume 3479, Laser Interferometry IX: Applications; (1998) https://doi.org/10.1117/12.316447
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Interferometry is an essential field of optical metrology and is adapted in many applications in optics, crystal growth, and industry. Crystal growth rate is one of the critical parameters for the growth of optical quality single crystals. A laser interferometry technique has been developed and applied successfully for crystal growth rate measurement from solution. A He-Ne laser at the wavelength of 633 nm with an output power of 1.5 mW was used in this experiment. The beam was incident on the crystal growing from solution. As the crystal is growing, the path length of the front and back surface reflected beams changes hence the phase factor of the detector output signal changes continuously. This phase change is directly related to the growth of crystal. The growth rate of the LAP crystal was found to be 6.5 plus or minus 0.1 nm/s. A Mach-Zehnder interferometer, also, has been applied to study the variation of concentration at the interface of the growing crystal from solution.

Citation Download Citation

Yong-Kee Kim, B. Rami Reddy, and Ravindra B. Lal "Laser and Mach-Zehnder interferometry for in-situ monitoring of crystal growth and concentration variation", Proc. SPIE 3479, Laser Interferometry IX: Applications, (6 July 1998); https://doi.org/10.1117/12.316447

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available