Strip gratings on dielectric substrates as output couplers for submillimeter lasers

Journal Article · Sat Mar 01 00:00:00 EST 1986 · Appl. Opt.; (United States)

DOI:https://doi.org/10.1364/AO.25.000619· OSTI ID:5899247

Veron, D; Whitbourn, L B

This paper describes the use and advantages of metallic strip gratings on dielectric substrates as output couplers for both optically pumped and discharge-excited submillimeter lasers. Formulas are presented for the calculation of transmittance and loss of such couplers, taking account of loss in the strip grating as well as loss and multiple reflections in the substrate. Included are expressions for the phase shifts on reflection and transmission by an arbitrary lossy grid on a plane boundary between two dielectrics according to a transmission-line model that is applicable for wavelengths in both dielectrics longer than the grid period. In relation to these phase shifts attention is drawn to an important sign convention. The theory is shown to agree well with measured transmittance of a typical device between 500 and 1600 GHz as well as spot measurements at 891 (337-..mu..m HCN laser), 1540, and 1578 GHz (195- and 190-..mu..m DCN laser). Finally, the theory is used to design a low-loss coupler for the low-gain 119-..mu..m line of discharge excited H/sub 2/O.

• Research Organization: Commissariat a l'Energie Atomique, Section de Confinement des Plasmas, BP6, 92260 Fontenay-aux-Roses, France
• OSTI ID: 5899247
• Journal Information: Appl. Opt.; (United States), Vol. 25:5
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
LASER MIRRORS
DESIGN
PERFORMANCE
DIELECTRIC MATERIALS
ELECTRICAL PUMPING
FAR INFRARED RADIATION
GRATINGS
LIGHT TRANSMISSION
METALS
OPTICAL PUMPING
PHASE SHIFT
POWER LOSSES
SUBSTRATES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LOSSES
INFRARED RADIATION
LOSSES
MATERIALS
MIRRORS
PUMPING
RADIATIONS
420300* - Engineering- Lasers- (-1989)