共查询到20条相似文献,搜索用时 15 毫秒
1.
S. A. Meyer J. A. Squier S. A. Diddams 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2008,48(1):19-26
We describe the detection and stabilization of the carrier envelope offset (CEO) frequency of a diode-pumped Yb:KYW (ytterbium-doped
potassium yttrium tungstate) femtosecond oscillator that is spectrally centered at 1033 nm. The system consists of a diode-pumped,
passively mode-locked femtosecond laser that produces 290 fs pulses at a repetition rate of 160 MHz. These pulses are first
amplified, spectrally broadened and temporally compressed to 80 fs, and then launched into microstructured fiber to produce
an octave-spanning spectrum. An f-2f nonlinear interferometer is employed with the broadened spectrum to detect and stabilize
the CEO frequency through feedback to the pump laser current. These results demonstrate that such a Yb-doped tungstate laser
can provide an efficient, compact, high-repetition-rate optical frequency comb with coverage from 650–1450 nm. 相似文献
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报道了一种基于飞秒锁模光纤激光脉冲基频光的光纤型差频产生(DFG)红外光梳及其研制技术.基于自主研制的重频锁定200 MHz飞秒锁模掺铒光纤激光器,经啁啾脉冲光纤放大与超连续谱产生技术,优化近零色散OFS光纤(型号:OFS-980-20)长度,结合可调延时线,获得了精准同步的基频双色脉冲;以GaSe为非线性晶体,利用光整流技术,产生了可在6—10μm范围内宽带调谐的DFG红外光梳,光梳最大光谱宽度可达1.3μm.这种光纤型远红外光梳可望在分子光谱精密测量等领域发挥重要作用. 相似文献
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We report what is to our knowledge the first measurement of the linewidth of the frequency comb lines of a mode-locked Er-doped fiber laser. By propagating the output pulses through fiber as long as 1000 km in a modified self-heterodyne arrangement, we have measured the effective linewidth of the comb lines to be less than 12 kHz on a 5-ms time scale; the width is due primarily to frequency jitter from environmental fluctuations. Deconvolution of the spectral line shapes by use of Voigt analysis yields an upper limit of the intrinsic Lorentzian width of 3 kHz. 相似文献
5.
We have demonstrated wideband frequency modulation of the frequency comb lines of a high-repetition-rate fiber laser. With a modulation frequency of only approximately 10 kHz, we have generated modulation indices in excess of 250. Although internally modulated, the laser remains stable with 2-kHz linewidths, and thus the 10-kHz modulation sidebands are still clearly resolved even after propagation over several hundred kilometers. This unique characteristic is used for simultaneous measurement of propagation distances to 1-m resolution and velocities of less than 3 mm/s over a distance of greater than 50 km. 相似文献
6.
A simple method to precisely measure fiber length has been experimentally demonstrated by using a mode-locked fiber laser configuration. Since the transit time in a cavity is exactly proportional to the cavity length, it is easy to obtain the fiber length from the generation of mode-locked pulses in the fiber laser with a long-range nonlinear optical loop mirror that includes the measured fiber. Our new method has a large measurement range, over hundreds of kilometers, and a high resolution, of the order of centimeters, as well as no measurement dead zone. 相似文献
7.
G. Galzerano A. Gambetta E. Fasci A. Castrillo M. Marangoni P. Laporta L. Gianfrani 《Applied physics. B, Lasers and optics》2011,102(4):725-729
We report on the absolute frequency measurement of an extended-cavity diode laser stabilized against a Doppler-free vibration?Crotation transition of the H2 18O isotopologue near 1.384???m. Absolute determination is performed by comparing the water-stabilized laser frequency with respect to a GPS-disciplined Rb microwave standard by means of a self-referenced fiber-based optical frequency comb. The line center frequency of the 22,1??22,0 transition of the H2 18O ??1+??3 combination band is found to be 216?519?045?955(13)?kHz. 相似文献
8.
J.-L. Peng H. Ahn R.-H. Shu H.-C. Chui J.W. Nicholson 《Applied physics. B, Lasers and optics》2007,86(1):49-53
A mode-locked Er:fiber laser-based optical frequency comb with high stability in the repetition frequency and carrier-envelope offset (CEO) frequency is realized. The CEO beat signal was detected right after the supercontinuum generation by a compact single-beam f–2f self-referencing interferometer, which does not require further delay compensation. The stabilized repetition frequency has an out-of-loop tracking stability of 1.3×10-13/ for an integration time τ less than 1000 s, which is limited by the stability of the frequency measurement system. The stabilized CEO frequency has a residual fluctuation of 0.52 mHz measured with a 1 s gate time. This is, to our knowledge, the highest tracking stability realized for fiber laser-based optical frequency comb. PACS 06.30.Ft; 42.60.Lh; 42.55.Wd 相似文献
9.
R. Paschotta A. Schlatter S.C. Zeller H.R. Telle U. Keller 《Applied physics. B, Lasers and optics》2006,82(2):265-273
The timing jitter, optical phase noise, and carrier-envelope offset (CEO) noise of passively mode-locked lasers are closely
related. New key results concern analytical calculations of the quantum noise limits for optical phase noise and CEO noise.
Earlier results for the optical phase noise of actively mode-locked lasers are generalized, particularly for application to
passively mode-locked lasers. It is found, for example, that mode locking with slow absorbers can lead to optical linewidths
far above the Schawlow–Townes limit. Furthermore, mode-locked lasers can at the same time have nearly quantum-limited timing
jitter and a strong optical excess phase noise. A feedback timing stabilization via cavity length control can, depending on
the situation, reduce or greatly increase the optical phase noise, while not affecting the CEO noise. Besides presenting such
findings, the paper also tries to clarify some basic aspects of phase noise in mode-locked lasers.
PACS 42.50.Lc; 42.60.Fc 相似文献
10.
We have performed detailed studies on the dynamics of a frequency comb produced by a mode-locked laser diode (MLLD). Orthogonal control of the pulse repetition rate and the pulse-to-pulse carrier-envelope phase slippage is achieved by appropriate combinations of the respective error signals to actuate the diode injection current and the saturable absorber bias voltage. Phase coherence is established between the MLLD at 1550 nm and a 775-nm mode-locked Ti:sapphire laser working as part of an optical atomic clock. 相似文献
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We report direct generation of <500-fs pulses at a 1-GHz rate from a self-starting passively mode-locked fiber laser by regeneratively synchronizing the pulses with a phase modulator. The pulses are amplified and passed through a dispersion-decreasing fiber and a normal-dispersion supercontinuum fiber. The resulting continuum is wider than 350 nm. 相似文献
13.
Self-stabilized carrier-envelope offset phase is achieved by use of difference-frequency (DF) generation. The spectrum from a Ti:sapphire oscillator is broadened in a photonic crystal fiber, and a DF (900 nm) between the blue component (490 nm) and the infrared component (1080 nm) is generated. The beat signal between the fundamental and the DF signal is clearly observed. The wavelength of the DF signal can be tuned down to 780 nm, and hence the signal can be used for injection seeding of a Ti:sapphire oscillator. 相似文献
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Pump-induced carrier envelope offset frequency dynamics and stabilization of an Yb-doped fiber frequency comb 下载免费PDF全文
In this paper, we demonstrate a carrier envelope phase-stabilized Yb-doped fiber frequency comb seeding by a nonlinear-polarization-evolution(NPE) mode-locked laser at a repetition rate of 60 MHz with a pulse duration of 191 fs.The pump-induced carrier envelope offset frequency( f0) nonlinear tuning is discussed and further explained by the spectrum shift of the laser pulse. Through the environmental noise suppression, the drift of the free-running f0 is reduced down to less than 3 MHz within an hour. By feedback control on the pump power with a self-made phase-lock loop(PLL)electronics the carrier envelope offset frequency is well phase-locked with a frequency jitter of 85 m Hz within an hour. 相似文献
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We evaluated the accuracy of an optical frequency comb in optical fibers by measuring the frequency shift after a sideband from an electro-optic modulator had passed through the fiber. We found that a frequency drift of a few hertz was due largely to a variation in the ambient temperature that corresponded to an increase in the square root of the Allan variance to 0.66 Hz. 相似文献
18.
Beverini N Carelli G De Michele A Maccioni E Nyushkov B Sorrentino F Moretti A 《Optics letters》2005,30(1):32-34
We demonstrate the possibility of using a femtosecond laser to measure with high accuracy the frequency of a far-infrared (FIR) monochromatic source, such as an optically pumped molecular laser, by generating in a suitable mixer a signal in the radio-frequency region at the frequency difference between n steps of a femtosecond comb and the FIR source. All the couples of modes lying a distance of n steps from one another contribute coherently to the heterodyne signal. The technique has been tested up to 670 GHz. 相似文献
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We report an experimental demonstration of a photonic microwave shifter using a highly chirped mode-locked fiber laser. The system is based on dispersive compression or expansion of highly chirped optical pulses that are amplitude modulated by the microwave signal. Using this technique, we demonstrated frequency shifting of a microwave signal from 10 GHz down to 5 GHz and up to 25 GHz. 相似文献