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Ultrabroadband beam splitter with matched group-delay dispersion
J Kim1, Jonathan R Birge, V Sharma
1Department of Electrical Engineering and Computer Science, Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA. jungwon@mit.edu
Optics Letters
|July 13, 2005
Summary
We developed a broadband thin-film beam splitter with matched group-delay dispersion. This design ensures consistent dispersion for both transmitted and reflected light, crucial for femtosecond laser applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Broadband beam splitters are essential optical components.
- Achieving matched group-delay dispersion in both transmission and reflection is challenging.
- Substrate dispersion often complicates optical coating designs.
Purpose of the Study:
- To present a general design strategy for broadband thin-film beam splitters.
- To achieve matched group-delay dispersion for both transmitted and reflected beams.
- To design and fabricate an ultrabroadband 50:50 beam splitter for femtosecond laser applications.
Main Methods:
- Incorporating substrate dispersion into the thin-film coating design process.
- Utilizing thin-film optical modeling and simulation.
- Fabrication and characterization of the designed beam splitter.
Main Results:
- A general design strategy for broadband beam splitters with matched group-delay dispersion was established.
- The design accounts for substrate dispersion to equalize transmission and reflection characteristics.
- An ultrabroadband 50:50 beam splitter (600-1500 nm) was successfully designed, fabricated, and characterized.
Conclusions:
- The proposed design strategy enables the creation of broadband beam splitters with precisely controlled dispersion.
- This approach is vital for advanced applications like femtosecond laser systems.
- Matched group-delay dispersion in beam splitters is achievable through careful substrate and coating design.