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TRB 2001 62 nd Ohio Spectroscopy Symposium Hongbing Chen & Wen-Bin Yan Tiger Optics, LLC Presented by Prof. Kevin Lehmann Prism-Based Cavity Ring-Down.

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Presentation on theme: "TRB 2001 62 nd Ohio Spectroscopy Symposium Hongbing Chen & Wen-Bin Yan Tiger Optics, LLC Presented by Prof. Kevin Lehmann Prism-Based Cavity Ring-Down."— Presentation transcript:

1 TRB nd Ohio Spectroscopy Symposium Hongbing Chen & Wen-Bin Yan Tiger Optics, LLC Presented by Prof. Kevin Lehmann Prism-Based Cavity Ring-Down Spectroscopy (CRDS): Broadband and Ultra-high Reflectivity

2 TRB nd Ohio Spectroscopy Symposium Prism Implementation of CW-CRDS Mirror-Based CW-CRDS: Bandwidth ~ 5% 0 ; Generally one species per cavity Broadband Prism Cavity: Brewster’s Angle Prism Retro-Reflectors* Total internal reflection (TIR) Brewster angle minimizes Fresnel reflection High finesse optical resonator over wide range *Prism-based CW-CRDS is a patented technique proprietary to Princeton University and exclusively licensed to Tiger Optics, LLC.  G. Engel, et.al in laser Spectroscopy XIV international conference(1999)

3 TRB nd Ohio Spectroscopy Symposium Prism Cavity: Low Q for s-Polarization

4 TRB nd Ohio Spectroscopy Symposium Prism Cavity: High Q for p-Polarization

5 TRB nd Ohio Spectroscopy Symposium Advances of Prism CRDS Technology  ~99.998% Equivalent High Reflectivity 17ppm one way loss at 1570 nm  Low-Stress Prism Assembly  Multi-Wavelength Laser Beam Integration Recent Tiger Optics’s Achievements

6 TRB nd Ohio Spectroscopy Symposium High Equivalent Reflectivity Ring-down Test for Fused Silica Prism

7 TRB nd Ohio Spectroscopy Symposium Low Stress Assembly  Low-stress prism mounting: Optical contacting  Monolithic structure, no moving parts  Easy access for prism cleaning  Flow cell for trace gas detection

8 TRB nd Ohio Spectroscopy Symposium Broadband Ability with No Moving Parts

9 TRB nd Ohio Spectroscopy Symposium Water Spectrum ( nm)  empty  peak

10 TRB nd Ohio Spectroscopy Symposium Multi-Wavelength Laser Beam Integration  Prism optics  Prism cell  Mode matching & pol. optics  Laser wavelength selection  Laser multiplexer OBJECTIVE: Multiple species trace analyzers for H 2 O, CH 4 and CO Laser 1 MUX Electronics & Software Laser 2 Laser 3 Detector Optics

11 TRB nd Ohio Spectroscopy Symposium Prism CRDS Cavity: A Powerful Spectroscopy Tool  High reflectivity and broadband  Compact prism cell without moving parts  Low-stress mounting  Pure p-polarization  Unidirectional wave in the cavity  See Talk TE08 for Prism using in visible range


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