For the first time, lasing at NV− centers in an optically pumped diamond sample is achieved. A nanosecond train of 150-ps 532-nm laser pulses was used to pump the sample. The lasing pulses have central wavelength at 720 nm with a spectrum width of 20 nm, 1-ns duration and total energy around 10 nJ. In a pump-probe scheme, we investigate lasing conditions and gain saturation due to NV− ionization and NV0 concentration growth under high-power laser pulse pumping of diamond crystal.
A light bullet (LB) is a wave packet of a few optical cycles that is extremely compressed in space and time, which is formed in the bulk transparent dielectric during femtosecond filamentation under anomalous group velocity dispersion. We demonstrate for the first time that the carrier-envelope phase shift during propagation of a near single-cycle LB causes synchronous oscillations of the spatial, temporal and energy parameters of its core with the period decreasing with increasing carrier wavelength. When analyzing the structure of color centers and induced plasma channels in fluorides, it was experimentally found that LB parameter oscillations lead to a periodic change in the nonlinear optical interaction with the dielectric.
Laser generation of NV‐centers in diamond with pulse energy up to 48 μJ and efficiency about 1% is performed. Also, we observe strong influence of low‐intensity short‐wavelength irradiation on pulse energy: in presence of this irradiation the pulse energy increased by factor up to 3.5. Additionally, we make an attempt to estimate theoretically our samples’ gain coefficient. GA. Laser generation with pulse energy up to 48 μJ and efficiency about 1% is performed using diamond, containing NV‐centers, as laser active element. Diamond crystal was pumped by 532 by 532 nm radiation. Also, strong influence of low‐intensity short‐wavelength irradiation on pulse energy is observed: in presence of this irradiation the pulse energy increased by factor up to 3.5.
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