Birefringence cavity dual-frequency lasers and relative mode splitting

An intracavity HeNe birefringent dual-frequency laser is investigated for applications. The substrate of such a laser cavity mirror is made of quartz crystal instead of ordinary optical glass. The surface that functions as the laser cavity mirror is coated with a high-reflecting thin film layer, whi...

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Bibliographic Details
Published in:Optical Engineering 1994-07, Vol.33 (7), p.2430-2433
Main Authors: Zhang, Shulian, Li, Kelan, Jin, Guofan
Format: Article
Language:English
Subjects:
426002 - Engineering- Lasers & Masers- (1990-)
COATINGS
DESIGN
ENGINEERING
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
GAS LASERS
Gas lasers including excimer and metal-vapor lasers
HELIUM-NEON LASERS
LASER CAVITIES
LASER MIRRORS
LASERS
MIRRORS
Optics
Physics
REFLECTIVE COATINGS
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Description
Summary:An intracavity HeNe birefringent dual-frequency laser is investigated for applications. The substrate of such a laser cavity mirror is made of quartz crystal instead of ordinary optical glass. The surface that functions as the laser cavity mirror is coated with a high-reflecting thin film layer, while the surface joined to the discharge tube is coated with an antireflecting thin film layer. Thus, the laser is an intracavity laser and the quartz crystal located inside the cavity causes the longitudinal mode to split into two modes (frequencies). To obtain the appropriate design parameters for various frequency differences, a series of quartz crystal cavity mirrors with different cut angles is experimentally investigated. The relationship of mode splitting and the cut angle are observed. To estimate the splitting by one mirror for different cavity lengths, the following concepts are presented: relative mode (frequency) splitting (ration of mode splitting versus longitudinal mode spacing) and relative optical path difference (ration of optical path difference versus half-wavelength).
ISSN:0091-3286
1560-2303
DOI:10.1117/12.172893