Abstract
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.
Highlights
Monocrystalline samples of IIa-type diamond with NV color centers created by means of high pressure and high temperature synthesis (HPHT) are currently available on the market[29,30,31]
Laser initialization, changing and reading the spin state of an NV− electron allows to control the state of a quantum system and turn NV− centers in diamond into a promising platform for optical quantum computing[12,13,14,15,16,17,18,19], quantum metrology, sensing and visualization, fluorescent magnetometry and laser threshold magnetometry that requires a CW laser constructed from the NV− centers[20,21,22,23,24,25,26]
We investigated in detail spectral properties of the HPHT diamond sample with two growth zones exhibiting different NV0 to NV− concentration ratios
Summary
Monocrystalline samples of IIa-type diamond with NV color centers created by means of high pressure and high temperature synthesis (HPHT) are currently available on the market[29,30,31]. In the recent work[32] the amplification of 721-nm laser radiation by stimulated emission from NV− centers in diamond inside an optical fiber cavity was demonstrated. We investigated in detail spectral properties of the HPHT diamond sample with two growth zones exhibiting different NV0 to NV− concentration ratios. We demonstrate that the diamond sample zone with a predominance of NV0 centers exhibits only pump-induced absorption of the probe, while the growth zone with a high concentration of NV− centers provides the probe amplification. The maximal detected gain coefficient is about 1.5 cm–1 that allows us to reach lasing conditions in the diamond sample zone with a predominant NV− concentration and, for the first time, we achieve a laser generation at NV− color centers in diamond
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