Direct measurement on transparent plates by using Fizeau interferometry

✍ Scribed by Dipankar Bhattacharyya; Ayan Ray; Bibhas K. Dutta; Pradip N. Ghosh

• Book ID: 104159654
• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 163 KB
• Volume: 34
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(01)00085-8

✦ Synopsis

It is shown that Fizeau interferometry provides an accurate optical method to measure the refractive index and wedge angle of transparent plates used as optical components in di erent experiments. A near IR external cavity diode laser having spectral resolution up to 10 -7 has been employed to measure the refractive index of the test plates by introducing amplitude modulation technique in the detection system of our phase shifting Fizeau interferometry. Detection of spatial fringes has been performed to ÿnd out the wedge angles of the plates by using a He-Ne laser along with the CCD-image sensor.