2-micron coherent Doppler lidar for space-based global wind field mapping. - Farzin Amzajerdian; Michael J. Kavaya; Upendra N. Singh; Jirong Yu (IGARSS, 2003)

An overview of NASA's Laser Risk Reduction Program. - Anne Marie Novo-Gradac; William S. Heaps; Upendra N. Singh (IGARSS, 2004)

Nasa's Laser Risk Reduction Program: A risk reduction approach for technology development. - Eduardo Torres-Martinez; William S. Heaps; Upendra N. Singh (IGARSS, 2010)

Backscatter 2-μm Lidar Validation for Atmospheric CO2 Differential Absorption Lidar Applications. - Tamer F. Refaat; Syed Ismail; Grady J. Koch; Manuel Rubio; T. L. Mack; Anthony Notari; James E. Collins; Jasper R. Lewis; R. De Young; Yonghoon Choi; M. Nurul Abedin; Upendra N. Singh (IEEE Trans. Geosci. Remote. Sens., 2011)

Integrating a Doppler wind lidar into a network of wind observing systems: Capitalizing on synergisms with a high precision, cloud scene penetrating lidar. - G. David Emmitt; Michael J. Kavaya; Upendra N. Singh (IGARSS, 2017)

Triple-pulse integrated path differential absorption lidar for carbon dioxide measurement - Novel lidar technologies and techniques with path to space. - Upendra N. Singh; Tamer F. Refaat; Mulugeta Petros (IGARSS, 2017)

MCT Avalanche Photodiode Detector FOR Two-MICRON Active Remote Sensing Applications. - Tamer F. Refaat; Upendra N. Singh; Mulugeta Petros; Ruben G. Remus (IGARSS, 2018)

Water Vapor Column Measurements With Infrared Active Optical IPDA Lidar. - Upendra N. Singh; Syed Ismail; Tamer F. Refaat; Mulugeta Petros (IGARSS, 2018)

Evaluation of 2-μm Pulsed Integrated Path Differential Absorption Lidar for Carbon Dioxide Measurement - Technology Developments, Measurements, and Path to Space. - Upendra N. Singh; Tamer F. Refaat; Mulugeta Petros; Syed Ismail (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2018)

Frequency Control of Multi-Pulse 2-micron Laser Transmitter for Atmospheric Carbon Dioxide Measurement. - Mulugeta Petros; Tamer F. Refaat; Upendra N. Singh; Charles W. Antill; Ruben G. Remus; Teh-Hwa Wong; Jane Lee; Syed Ismail (IGARSS, 2019)

Ground Testing of 2μm Triple-Pulse IPDA Lidar for Carbon Dioxide and Water Vapor Measuremets. - Tamer F. Refaat; Mulugeta Petros; Upendra N. Singh; Charles W. Antill; Ruben G. Remus; Syed Ismail (IGARSS, 2019)

Active Optical Remote Sensing Sensors and Instrumentation for NASA's Future Earth and Space Science Measurements/Missions. - Upendra N. Singh (IGARSS, 2019)

High-Precision and High-Accuracy Column Dry-Air Mixing Ratio Measurement of Carbon Dioxide Using Pulsed 2- $ mu$ m IPDA Lidar. - Tamer F. Refaat; Mulugeta Petros; Upendra N. Singh; Charles W. Antill; Ruben G. Remus (IEEE Trans. Geosci. Remote. Sens., 2020)

Profiling of Mars Atmospheric Carbon Dioxide Isotopologues Using 2-Micron Orbiting Lidar. - Tamer F. Refaat; Upendra N. Singh (IGARSS, 2024)