Holographic interferometry with an injection seeded Nd:YAG laser and two reference beams

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Holography is a powerful technique for recording and reconstructing 3D wavefronts.
• Dual-reference-beam holography offers advantages in specific applications.
• The choice of laser source significantly impacts holographic recording quality.

Purpose of the Study:

• To compare the performance of twin injection seeded Nd:YAG lasers with argon-ion lasers for dual-reference-beam holography.
• To evaluate the suitability of Nd:YAG lasers for industrial optical inspection applications.

Main Methods:

• Holographic recording in Agfa 8E56 emulsion using both laser types.
• Optical heterodyning technique for precise interference measurement.
• Quantification of performance using heterodyning signal level and intensity signal-to-noise ratio.

Main Results:

• Nd:YAG lasers demonstrated performance comparable to argon-ion lasers for dual-reference-beam hologram recording.
• Heterodyning signal levels and intensity signal-to-noise ratios were analyzed for both systems.
• The Nd:YAG laser system proved effective for the intended holographic applications.

Conclusions:

• Twin injection seeded Nd:YAG lasers are a viable alternative to argon-ion lasers for dual-reference-beam holography.
• The Nd:YAG laser system is well-suited for non-destructive optical inspections of structures.
• This research supports the use of advanced laser systems in industrial metrology.