Sensitivity of cw and pulsed laser-pumped Pr infrared quantum counters
- 1 July 1979
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 50 (7) , 4509-4516
- https://doi.org/10.1063/1.326557
Abstract
The characteristics of LaBr3 : Pr and LaCl3 : Pr infrared quantum counters used for detection near 4.5 μm have been investigated in detail. Quantum efficiency for infrared‐to‐visible upconversion is in agreement with our estimates based on the spectroscopic properties of these materials. Highest sensitivity was obtained with pulse laser pumping in LaCl3 : Pr at 82 °K. Maximum crystal quantum efficiency and detectivity under these conditions were Q=1.2×10−3 and D*=1.4×109 cm Hz1/2/W. The detectivity is the highest reported for any IRQC device. Pump‐induced fluorescence measured without ir signal proved to be the limiting source of noise for both cw and pulsed pumping.This publication has 9 references indexed in Scilit:
- A thermal imaging system based on the PrCl3 quantum counterApplied Physics Letters, 1975
- Radiative and Nonradiative Transitions in La: Pr and PrPhysical Review B, 1973
- Laser optical double resonance and efficient infrared quantum counter upconversion in LaCl3 : Pr3+ and LaF3 : Pr3+Journal of Applied Physics, 1973
- Noise considerations for infrared quantum counters: the oxygen-fired CdF2 : Er3+ IRQCJournal of Applied Physics, 1972
- Multiphonon Orbit-Lattice Relaxation of Excited States of Rare-Earth Ions in CrystalsPhysical Review B, 1968
- Rare Earth Infrared Quantum CounterApplied Optics, 1968
- Improved rare-earth trichloride infrared quantum counter sensitivityIEEE Journal of Quantum Electronics, 1968
- Concentration Broadening and Oscillator Strengths in Pr:LaCl3The Journal of Chemical Physics, 1966
- Solid State Infrared Quantum CountersPhysical Review Letters, 1959