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We report on accuracy test results on the comparison of two different types of optical frequency combs, each of those referenced to a microwave frequency standard and an optical frequency standard. One of those combs is based on a mode-locked erbium-doped fiber laser and the other is based on a Ti:sapphire femtosecond laser. The comb comparison was carried out by measuring an absolute frequency of...
Two fiber-based frequency combs were compared at 633 nm. An offset laser was locked to a frequency comb, and the locked laser was measured with another comb. Consequently, the frequency uncertainty of the combs was less than 3 times 10-16 at 10 000 s averaging, which is sufficiently lower than the uncertainty of UTC.
This paper demonstrates two approaches to determine the absolute mode number of the comb line for a semi-automatic optical frequency counter based on two mode-locked fiber laser combs. In the first approach, two laser combs were operated at three different repetition rates with two of them are so close to each other that their beating mode numbers are the same. In the second approach, the laser combs...
We demonstrate a DFB laser that can be injection locked to desire single mode of a femtosecond fiber laser comb. The femtosecond injection locking technique that can select one component among the fiber laser comb modes was applied to the comb selection. The DFB laser injection locked to the desired comb mode was used as optical frequency reference for absolute frequency measurement of an acetylene...
The method for measurement of different femtosecond laser radiation parameters using Fabry-Perot interferometer is suggested. The self- mode locked Cr:forsterite laser was used in our experiments. The average wavelength of a laser radiation lambda0, laser radiation spectrum width deltalambda and general offset f0 of frequency comb were determined.
Experimental setup We report on a generation of two coherent continuous wave (cw) laser sources with a wavelength difference of 57 nm based on a femtosecond laser frequency comb (FLFC) injection locked diode lasers. The FLFC wavelength near 852 nm is optically injected to the DBR diode laser, and the other DFB diode laser is injection locked by a FCFL at near 794 nm. Two diode lasers are independently...
We report a stabilization of a femtosecond laser frequency comb (FLFC) to a high-finesse optical cavity by introducing a comb injection locked diode laser. In our method, single component of a FLFC is selected and amplified by a diode laser, and used for a stabilization of a FLFC. Thus, we don't need to match the mode spacing between a femtosecond laser and a high-finesse optical cavity.
We describe a fiber-based acetylene-stabilized laser, where light is coupled to free-space only to pass through the acetylene cell. The system is constructed using standard components, which makes the approach cost effective and straightforward to implement. The Doppler-free spectrum of acetylene is detected using a simple collinear pump-probe geometry, even without a lock-in amplifier, when the length...
We have calculated the quantum-limited lineshape of the comb lines from a mode-locked Ti:sapphire laser using experimentally-derived parameters for the linear response and quantum noise drivers from a generalized soliton perturbation theory. The detailed lineshape has small contributions from relaxation oscillations and frequency pulling. Our results are relevant in determining the fundamental limitation...
A pair of optical cavities are designed to be insensitive to both temperature fluctuations and mechanical vibrations. The fractional frequency stability of a laser locked to one of these cavities reaches a floor of 2 times 10-15 for averaging times in the is attributed to range 0.5 s - 100 s. This limit Brownian motion of the mirrors.
We construct a highly stable comb laser based on one compact 822 nm diode laser and one 25-mm long cesium vapor cell, for the first time to our knowledge. It is advantaged that more than 99% comb laser power could be delivered to user since no any nonlinear process is needed for locking laser frequency. The relative merits of atomic transition- based frequency combs are discussed and we demonstrated...
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