He-Ne gaseous ring-laser gyroscopes(RLGs)have brought great breakthroughs in numbers of fields such as inertial navigation and attitude control in the past 50 years.However,their counterparts of all-solid-state,active...He-Ne gaseous ring-laser gyroscopes(RLGs)have brought great breakthroughs in numbers of fields such as inertial navigation and attitude control in the past 50 years.However,their counterparts of all-solid-state,active RLGs have been far behind even though they have a few indispensable advantages.Here,we propose and demonstrate an all-solid-state,active RLG based on a millimeter-sized,single monolithic non-planar ring oscillator(NPRO)with a gain medium of Nd:YAG crystal or Nd-glass.The clockwise(CW)and counter-clockwise(CCW)laser modes in NPRO are simultaneously initiated under a regime of laser feedback interferometry,whose nonzero frequency difference intrinsically formats the single monolithic NPRO working as a Sagnac laser gyroscope without a noticeable lock-in effect.The higher wavefront distortion in NPRO samples is revealed to introduce less mode competition(higher beat frequency stability)between the two laser modes,which is a precondition to build the NPRO gyroscope.Under a free-running condition,the NPRO gyroscope typically has a bias instability of 31.3 deg∕h and an angle random walk of 0.22 deg∕√h p with a scale factor of 38.3 Hz∕(deg s^(−1)),and the instability is mainly caused by the magnetic noise at present.The NPRO gyroscope can be enclosed in a centimetersized package,with a power consumption below 0.7 W and a mass under 20 g.Moreover,the stability performance can be further improved by NPRO design and active noise suppression in the future.Such compact,low-power-consumed,and highly stable RLGs may find important applications in aerospace,defense,and industry.展开更多
We report a single-frequency,narrow-linewidth semiconductor pulsed laser based on pump current modulation and an optical injection locking technique.A homemade monolithic non-planar ring oscillator laser is employed a...We report a single-frequency,narrow-linewidth semiconductor pulsed laser based on pump current modulation and an optical injection locking technique.A homemade monolithic non-planar ring oscillator laser is employed as the seed to guarantee the single-frequency narrow-linewidth performance.Simultaneously,pulse operation is achieved by directly modulating the pump current of the semiconductor laser.The single-frequency pulsed laser has achieved a pulse repetition rate of 50 kHz-1 MHz,a pulse duration ranging from 120 ns to a quasi-continuous state,and a peak power of 160 mW.Moreover,the single-frequency pulsed laser(SFPL)has reached a carrier linewidth as narrow as 905 Hz±16 Hz,and an optical spectrum signal-to-noise ratio of better than 70 dB at a center wavelength of 1064.45 nm.Such an extremely narrow-linewidth,repetition-rate,and pulse-width tunable SFPL has great potential for applications in coherent LIDAR,metrology,remote sensing,and nonlinear frequency conversion.展开更多
基金National Natural Science Foundation of China(12404489)Fundamental Research Funds for the Central Universities+2 种基金Sun Yat-sen University(24QNPY162)National Key Research and Development Program of China(2020YFC2200200,2023YFC2205500)Major Projects of Basic and Applied Basic Research in Guangdong Province(2019B030302001)。
文摘He-Ne gaseous ring-laser gyroscopes(RLGs)have brought great breakthroughs in numbers of fields such as inertial navigation and attitude control in the past 50 years.However,their counterparts of all-solid-state,active RLGs have been far behind even though they have a few indispensable advantages.Here,we propose and demonstrate an all-solid-state,active RLG based on a millimeter-sized,single monolithic non-planar ring oscillator(NPRO)with a gain medium of Nd:YAG crystal or Nd-glass.The clockwise(CW)and counter-clockwise(CCW)laser modes in NPRO are simultaneously initiated under a regime of laser feedback interferometry,whose nonzero frequency difference intrinsically formats the single monolithic NPRO working as a Sagnac laser gyroscope without a noticeable lock-in effect.The higher wavefront distortion in NPRO samples is revealed to introduce less mode competition(higher beat frequency stability)between the two laser modes,which is a precondition to build the NPRO gyroscope.Under a free-running condition,the NPRO gyroscope typically has a bias instability of 31.3 deg∕h and an angle random walk of 0.22 deg∕√h p with a scale factor of 38.3 Hz∕(deg s^(−1)),and the instability is mainly caused by the magnetic noise at present.The NPRO gyroscope can be enclosed in a centimetersized package,with a power consumption below 0.7 W and a mass under 20 g.Moreover,the stability performance can be further improved by NPRO design and active noise suppression in the future.Such compact,low-power-consumed,and highly stable RLGs may find important applications in aerospace,defense,and industry.
基金supported by the National Natural Science Foundation of China(No.12404489)the National Key Research and Development Program of China(Nos.2023YFC2205504 and 2020YFC2200200)+2 种基金the Major Projects of Basic and Applied Basic Research in Guangdong Province(No.2019B030302001)the Fundamental Research Funds for the Central Universities,Sun Yat-sen Universitythe support from the China National Space Administration(CNSA)。
文摘We report a single-frequency,narrow-linewidth semiconductor pulsed laser based on pump current modulation and an optical injection locking technique.A homemade monolithic non-planar ring oscillator laser is employed as the seed to guarantee the single-frequency narrow-linewidth performance.Simultaneously,pulse operation is achieved by directly modulating the pump current of the semiconductor laser.The single-frequency pulsed laser has achieved a pulse repetition rate of 50 kHz-1 MHz,a pulse duration ranging from 120 ns to a quasi-continuous state,and a peak power of 160 mW.Moreover,the single-frequency pulsed laser(SFPL)has reached a carrier linewidth as narrow as 905 Hz±16 Hz,and an optical spectrum signal-to-noise ratio of better than 70 dB at a center wavelength of 1064.45 nm.Such an extremely narrow-linewidth,repetition-rate,and pulse-width tunable SFPL has great potential for applications in coherent LIDAR,metrology,remote sensing,and nonlinear frequency conversion.
