Variable-aperture calorimeter for an unstable resonator
Abstract
A technique for measuring the output power from a CW edge-coupled unstable resonator has been developed and applied to a CW DF laser. An internal-cavity calorimeter was used that permits measurement of output power with a variable rectangular mode geometry while containing the radiation inside the resonator. The variable-aperture calorimeter absorbing scraper (VACAS) device consists of an absorbing copper-plate calorimeter assembly, which replaces the 45-deg output coupling mirror of a conventional edge-coupled unstable cavity. A rectangular hole in the plate of variable width and height defines a rectangular mode of variable width and height within the geometric-optics approximation. Two important applications of VACAS are: (1) the determination of the optimum mode geometry for a CW diffusion-type chemical laser where there is significant variation in gain across the unstable resonator mode and (2) the determination of the power tradeoff between mode width and the number of folds in a folded unstable resonator configuration.
- Publication:
-
Applied Optics
- Pub Date:
- October 1976
- DOI:
- 10.1364/AO.15.002367
- Bibcode:
- 1976ApOpt..15.2367C
- Keywords:
-
- Calorimeters;
- Cavity Resonators;
- Chemical Lasers;
- Continuous Wave Lasers;
- Deuterium Compounds;
- Hf Lasers;
- Apertures;
- Coupled Modes;
- Fluorides;
- Laser Outputs;
- Nozzle Geometry;
- Power Gain;
- Resonant Vibration;
- Variable Geometry Structures;
- Instrumentation and Photography;
- LASERS;
- RESONATORS