Have you heard of laser oscillators?
The high output of laser generators (oscillators) that oscillate high power laser pointer has been developed, and lasers of various wavelengths have recently begun to be used in the industry. With the increase in output, it has been installed on sheet metal processing machines one after another. In response to the demand for higher speeds, the output power of fiber lasers in the industry has gradually increased to more than 10 kW today. High-power lasers are short-wavelength lasers that take advantage of wavelength processing and have attracted people's attention. The first is probably a fiber laser, which officially entered the market after 2005. Although it is a so-called blue laser, it is a blue semiconductor laser with a wavelength of 450 nanometers. By forming a stacked array, it has been able to extract more than 700 watts of power. From dye lasers to Kerr lens mode-locked Ti:Sapphire femtosecond lasers, and later diode-pumped all-solid-state femtosecond lasers and femtosecond fiber lasers, although the pulse width and energy records are constantly being updated, the biggest progress is not Obtaining ultra-femtosecond pulses too much becomes a breeze.
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The laser oscillator is composed of 532nm pump light, Ti:Sapphire crystal, laser resonator and dispersion compensation element. The 532nm pump light is irradiated on the Ti:Sapphire crystal through the pump light guide device to generate stimulated radiation. , The stimulated radiated light oscillates back and forth in the laser cavity to be amplified, and output continuous light. The dispersion compensation element is placed in the cavity to compensate the dispersion generated by the output laser oscillation in the cavity, which is characterized by the use of perturbation mode locking method It is realized in the form of reflected light outside the cavity. R. Trebino of Sandia National Laboratory said: "In the past 10 years, (ultrafast) technology has improved significantly. Titanium sapphire lasers and now fiber lasers are simplifying the operation of this (femtosecond) laser. And stable. This kind of green laser pointer is now available for purchase, but 10 years ago, you had to build it yourself." As an optical oscillator, a laser is mainly composed of an optical amplifier and a feedback system, and its basis is stimulated radiation. When the laser is working, part of the output excitation light is returned to the input end of the amplifier through the feedback system (under certain phase matching conditions), as the input signal of the amplifier, so that the reciprocating loop realizes the feedback amplification, because the laser itself has certain Loss, when the gain of the laser compensates for the loss of the laser, the steady state is reached, and the output signal of the laser remains unchanged.
2022-01-05 12:04:38
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