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1.
The pulse width of a synchronously pumped laser chiefly depends on the available cavity bandwidth and the pump-pulse duration. A functional form of this dependence was suggested in the literature. We present an alternate relation which is supported by analytical and numerical results, as well as by experimental results, obtained by us and by others.  相似文献   

2.
Subpicosecond pulse generation has been examined in synchronously pumped mode-locked ring dye laser systems. These include hybrid and composite absorber/gain media arrangements as well as a simple synchronous cavity. The shortest pulses recorded were 0.3 ps for the hybrid system, and this has been shown to be critically dependent on the positioning of the absorber jet in the centre of the cavity to better than 50 m. Stable operation for subpicosecond pulse generation has been achieved in the ring configuration with greater wavelength tunability and higher average power conversion efficiency than with conventional cavity arrangements.  相似文献   

3.
Pulse formation in synchronously pumped dye lasers with fast relaxing dyes is treated by computer simulation. The influence of spontaneous emission and chirp, as well as cavity mismatch, on the pulse characteristics and stability of generation are discussed.  相似文献   

4.
We report the generation of tunable high-repetition-rate optical pulses in the mid-infrared using synchronously pumped parametric oscillation in periodically poled LiNbO3 (PPLN). Using a Kerr-lens-mode-locked Ti:sapphire laser as the pump source and a PPLN crystal incorporating grating periods of 21.0–22.4 μm, we have achieved wavelength conversion in the -–4 6μm spectral range in the mid-infrared. The use of a semi-monolithic cavity design and hemispherical focusing has permitted pulse generation in the strong idler absorption region of PPLN, resulting in a simple, compact, all-solid-state configuration with a pump power threshold as low as 17 mW and mid-infrared idler powers of up to 64 mW at 9% extraction efficiency. Signal output powers of up to 280 mW at 35% extraction efficiency are available over the -–1.004 1.140μm spectral range at 80.5 MHz and pulse repetition rates at harmonics of the fundamental frequency up to 322 MHz have also been obtained. Received: 5 December 2000 / Revised version: 23 January 2001 / Published online: 27 April 2001  相似文献   

5.
Experimental results from studies of the laser characteristics of Nd:LSB crystals in both cw and passive Q-switching arrangements are presented. The dependence of the main laser parameters on the output coupling and saturable absorber transmission for two doping levels of Nd was investigated. It is demonstrated that due to its high absorption, low losses and intrinsic strong thermal lensing, even at pump powers of less than 200 mW, the Nd:LSB has excellent properties in terms of efficiency, beam quality and pulse duration. In addition, it exhibits high pulse-to-pulse and pulse width versus pump power stability. Received: 11 June 2001 / Revised version: 30 July 2001 / Published online: 15 October 2001  相似文献   

6.
The circulation of a synchronously mode locked dye laser pulse in a linear cavity configuration containing a dye cell as an active medium and a bandwidth-limiting element is treated. The condition that the pulse shape reproduces after each cavity round-trip provides a nonlinear integro-differential equation for the steady-state pulse shape. For the solution of this equation an approximate method, not limited to small pulse energies, is given and the pulse duration, intensity, energy, asymmetry of the pulse shape, stable regions and other interesting parameters are discussed.  相似文献   

7.
We present theoretical results on the characteristics of pulses generated by a synchronously pumped dye laser. Our analysis indicates the important influence of spontaneous emission on shape and frequency chirp of the pulse. Dye-laser operation is possible within a wide range of cavity mismatch. A large mismatch of the lengths of the dye and the pump-laser cavity results in the generation of noise bursts caused by the influence of spontaneous emission. At small cavity mismatch pulse profile and frequency chirp of the pulse are directly generated in the steady-state regime by algebraic equations. Our formulas indicate that the sign of the pulse chirp depends only on the sign of the shift between laser frequency and centre frequency of the amplifying transition.  相似文献   

8.
We theoretically and experimentally investigate wavelength tuning of synchronously pumped optical parametric oscillators (OPOs) on changing the cavity length or the pump-repetition rate. Conditions for rapid and wide-range wavelength access are derived. Using an OPO pumped directly by a mode-locked diode-laser master-oscillator power-amplifier (MOPA) system, an all-electronically controlled access to near- and mid-infrared wavelengths is demonstrated. The singly (signal) resonant OPO is based on periodically poled lithium niobate (PPLN) and emits 8 ps idler pulses at a repetition rate of 2.5 GHz in the wavelength range 1986 to 2348 nm (signal: 1530 to 1737 nm). Wavelength tuning over 114 nm (signal) and 189 nm (idler) is achieved solely by electronically varying the repetition rate of the diode-laser oscillator over 720 kHz. By controlling the repetition rate with a programmable driver, an arbitrary emission sequence of the OPO on two wavelength channels is generated, with access times as short as 10 μs. 11 OPO wavelengths equally spaced in the range 1627–1689 nm (signal) or 2054–2154 nm (idler) could be addressed. Received: 6 September 2000 / Revised version: 16 March 2001 / Published online: 23 May 2001  相似文献   

9.
Ultrafast ytterbium-doped bulk lasers and laser amplifiers   总被引:7,自引:0,他引:7  
We review recent achievements with ultrafast bulk lasers and amplifiers based on Yb:YAG and Yb:glass. Special attention is paid to those aspects of the quasi-three-level nature of these gain media that are important for short-pulse generation. The potential of Yb-doped media for efficient short-pulse generation and amplification is compared to their Nd-doped counterparts. Received: 4 January 1999 / Revised version: 15 March 1999 / Published online: 26 May 1999  相似文献   

10.
《Optics Communications》1987,63(3):179-184
Equations describing steady-state pulses circulating in synchronously pumped dye lasers with dyes of arbitrary fluorescence lifetime are derived and solved by numerical methods. Special attention is devoted to infrared emitting dyes characterized by short fluorescence lifetimes in the order of 10 ps. The results are compared with the case of slow dyes typically used in the visible spectral region.  相似文献   

11.
We describe a laser-cooling experiment on Mg+ ions confined in an electromagnetic trap (Penning trap or rf trap) and give the preliminary experimental results. In particular, we have observed a laser cooling in the Penning trap configuration in which a measured temperature of about 1 K has been obtained.  相似文献   

12.
Received: 1 April 1996/Revised version: 24 September 1996  相似文献   

13.
00 operation have been investigated under different pump light distributions that have been formed by a virtual-point-source pumping system. Compared with a central uniform distribution, a centrally depressed distribution is found to have a lower thermal lensing effect and a higher optical-to-optical efficiency for operations performed using the same resonator parameters or within a similar stable range, and the improvement in optical-to-optical efficiency is explained as a result of a reduction in thermally induced aberrations. Received: 10 June 1997  相似文献   

14.
Generation of tunable near-infrared picosecond and subpicosecond pulses in a synchronously pumped cw mode-locked Oxazine-1-perchlorate dye laser has been investigated for different values of the important system parameters. The experimental results confirm the predictions of a simple theoretical model which describes the steady-state pulse duration in terms of gain modulation strength, pump power, intracavity bandwidth, pump pulse length and cavity detuning. For a pump-pulse length of 100 ps and a bandwidth of more than 500 Å for the intracavity tuning element dye-laser pulses as short as 0.35 ps have been obtained. Under these conditions up to 100 mW of average output power were provided. In addition, mode-locking of an Oxazine 750 dye laser by synchronous pumping with the cw train of pulses obtained from the Oxazine-1-Perchlorate laser is reported.  相似文献   

15.
16.
A technique has been developed for the generation of Laguerre–Gaussian (LG0,l) modes in a fiber-coupled laser diode end-pumped microchip laser. A theoretical model is also developed to predict how the oscillation of LG0,l modes is affected by the pump position, the pump size and the cavity mode size. With a 1-W fiber-coupled diode, the highest-order LG0,l mode that can be generated is l=23. Received: 8 June 2000 / Revised version: 2 July 2000 / Published online: 20 September 2000  相似文献   

17.
An analysis of cw synchronously pumped dye lasers is presented. Under the assumption that the cavity (tuning element) bandwidth is much wider than the bandwidth of the transform limited pulses generated, the pulse forming dynamics is rigorously treated. It is shown that for a finite mismatch between the lengths of the dye and the pump lasers, a steady-state pulse develops in the dye laser cavity with a conserved pulseshape. The characteristics (energy, shape, peak power, duration) of these pulses of ultimate width are quantitatively determined as a function of cavity mismatch. An analytical solution for the pulse envelope is determined, which yieldsI(t)∝Sech2(t/t p ) to a good approximation.  相似文献   

18.
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20.
In this article we have, for the first time, performed a series of lifetime tests for the continuous wave radiofrequency-excited atomic xenon laser in the 1.7–3.9 μm regime. Different constructions and electrode materials are used to investigate the usefulness of this laser during long-term sealed-off operation. The influence of electrode material on wall–plasma interactions and the effect of gas impurities on the long-term operation of the laser are investigated and discussed. Received: 30 August 1999 / Published online: 23 February 2000  相似文献   

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