Stable pulses at the repetition of 6.25 MHz with 691.2 fs pulse width were generated. The spectrum bandwidth of the fiber laser at center wavelength of 1 561.5 nm was about 21.7 nm.
When the cavity's positive dispersion is compensated by two prisms and a semiconductor saturable absorber mirror is used to start the mode-locking, the mode-locked spectrum width of 37nm has been obtained and the center wavelength is 1520nm.
Based on the transmission theory of the arrayed waveguide grating(AWG),the parameter optimization was performed,and the effect of arrayed waveguides bending on transmission characteristics was analyzed for a 33×33 polymeric AWG multiplexer around the central wavelength of 1550.918 nm with the wavelength spacing of 0.8 nm.
The system generates 352 fs pulses with repetition rate of 12.5 MHz and the 3dB spectrum width of about 7.8 nm at the central wavelength of 1563.3 nm. A low-cost erbium-doped fiber amplifier is employed to boost the peak power of the pulses.
Supercontinuum emission with a smooth spectrum stretching from 450 to 1 400 nm is obtained by injecting 30 fs Ti: sapphire laser pulses with an energy of up to 5 nJ,a pulse repetition rate of 100 MHz and a central wavelength of 800 nm into 2 meters of such a photonic crystal fiber.
By adjusting the cavity which was typically plane-concaved structure carefully,the laser was obtained at 1005 nm centre wavelength and the output power was 40 mW. The optical-optical efficiency was 2.7%.
The dependence of the SF pulse width compression, the shift of the SF centre wavelength and the gain band on pump pulse parameters and dye concentrations were studied experimentally.
Two mechanisms for realizing tunable centre wavelength of F-P cavity interference fllter are presented. A typical filter structure which denter wavelenth is changed by changing cavity length is shown and its corresponding voltage-driving circuit is given.
A six layer planar waveguide model has been proposed to analyse the ion beam etched fiber grating filter After optimizing the parameters,in our experiment,we have obtained a narrow band high reflectivity Bragg fiber filter with 1530 6nm centre wavelength,99% reflectivity and 0 3nm bandwidth
Using NaCl(OH-):(F2+)H color center crystal made by authors as laser medium, the low temperature infrared tunable CW color center laser operation has been realized successfully in the X-model laser cavity, with tunable laser wavelength from 1. 40 μm to 1. 75μm and its peak wavelength is at 1. 57μm.
The laser output, energy density and intrinsic efficiency were 1.17mJ, 9mJ/ L and 0.016%, respectively. The laser spectrum showed a peak wavelength at 477nm and a bandwidth of 32nm (FWHM ).
The experiment results show that the center wavelength λ 0 and peak wavelength λ p of the DFB laser have been locked to 1308.279 (nm)(400S) and the 20dB line width of laser has been compressed from 0.30nm before frequency stabilization to 0.12nm at present.
The InGaAsP/GaAs SCH SQW lasers were fabricated by rapid liquid phase epitaxy with proved multiple sliding boat technique. The measured results of the device show that its threshold current is of the order of 0.70 A, with the CW power of 4 W at peak wavelength of 808.8 nm.
For a center wavelength of FBG of about 1550 nm and a 40 nm shift range of its reflection wavelength, the relative error of measurement is only ± 0.001.
The wavelength of the light source is modulated at a frequency of 10?kHz, and the center wavelength is stabilized at the center of the 2ν3 band R(3) line of methane (1.65372?μm).
Variations in the intensity of the solar radiation are measured in the six spectral intervals of the multi-channel photometer: 350, 500, 650, 850, 1100, and 1500 nm, with the bandwidths being about 10% of the central wavelength of each interval.
The RATAN-600 Zenith Field (RZF) catalog was obtained at the central wavelength of 7.6 cm, and contains 437 radio sources, virtually all of which have been identified with NVSS objects.
This effect reduces unwanted variations in the central wavelength, as well as fluctuations of the delay time of the frequency-shifted soliton with respect to the input pulse.
By slightly tuning the central wavelength of the narrowband FBG, SLM lasing at 1549.658 or 1549.563 nm (corresponding to the two transmission peaks of the FBG-FPF) is achieved with a laser output power of ～4 mW, when the pump power is ～75 mW.
The repetition rate of the laser oscillator is 173 MHz at the centre wavelength of 791 nm, and the ultrabroaden spectrum covers from 600 nm to 1000 nm.
At the optimum length of 7?m (αeffL=2.9, where αeff is the effective absorption coefficient of the fibre and L is the fibre length), the fibre laser output was measured to have a centre wavelength of 2105?nm and a line width of ～20?nm.
Theoretical calculations show that, by inserting an intermediate dielectric layer with suitable thickness and shape between the fibres, the centre wavelength can be shifted easily over a range of ±30 nm.
High-intensity PL was observed at a temperature of 80 K, with a peak half-width of 30-50 meV and a peak wavelength in the range from 2 to 4.5 μm, depending on the QW width, which varied between 4 and 20 nm, respectively.
It is shown that σ and EU, quantities representing the scale of the exciton-localization effects, vary linearly with the photoluminescence-peak wavelength in the range from the ultraviolet to the green region of the spectrum.
中心波长
center wavelength 
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