Tunable UV LIDAR for Water Vapor Profiling and Ozone Monitoring

Period of Performance: 05/14/1997 - 08/14/1999

$745K

Phase 2 SBIR

Recipient Firm

Coherent Technologies, Inc.
135 S. Taylor Avenue,
Louisville, CO 80027
Principal Investigator

Research Topics

Abstract

A multi-function ultraviolet (UV) sensor suitable for (1) profiling atmospheric water vapor using the Raman lidar technique and (2) measuring atmospheric ozone using the Differential Absorption Lidar (DIAL) technique is proposed. In Phase I, CTI conducted detailed system performance modeling demonstrating that both of these lidar functions could be combined into a single UV sensor while simultaneously meeting range, sensitivity, and integration time requirements. Additionally, hardware experiments demonstrated that tunable UV radiation at output energies exceeding 15 mJ and .289 nm could be reliably generated unsing a Ce:LiCAF laser. In Phase II, an innovative lidar transmitter based on an all solid-state (diode-pumped) Yb drive laser pumping a tunable Ce:LiCAF laser will be built. Tunable, UV laser output at 256 nm, 280 to 315 nm, and at 344 nm will be available for lidar experiments. Advantages of this approach include (1) eye safety; (2) the sensor can be readily configured (no changes in laser hardware) to monitor temperature, winds, other atmospheric gas species such as sulfur dioxide, and hazardous bioaerosol clouds; (3) high reliability and low maintenance due to diode pumping; and (4) reduced system size, weight, and cooling requirements compared to conventional multi-kilometer range UV lidars.