Solid-state pulsed laser system incorporating provision for generating higher harmonics of radiation

FIELD: laser engineering.

SUBSTANCE: proposed solid-state pulsed laser system designed for operation in subnanosecond and nanosecond frequency bands incorporating provision for converting radiation frequency into higher harmonics in visible and ultraviolet spectrum ranges has microchip laser with passive gate of YAG:Cr4+ crystal, two-port amplifier, and nonlinear components for converting radiation frequency into higher harmonics. In addition, it is provided with preamplifier. Introduced into preamplifier optical system on one end of active element are first nontransmitting mirror, input polarizer, electrooptic element, 90-deg. polarization-plane shifter installed on first two-position shifting device, prism, output polarizer, turning mirror, second nontransmitting mirror covered with first section of double-section screen, and third nontransmitting mirror. Electrooptic element is introduced in optical system of two-port amplifier.

EFFECT: ability of generating unidirectional digitally frequency-tuned pulses with smoothly varying power.

1 cl, 1 dwg, 1 tbl

 

The invention relates to laser technology, in particular a pulsed solid-state laser systems with the generation of high harmonic radiation.

Pulsed lasers q-switched resonator as generators of powerful radiation pulses in the nanosecond range of durations of the pulses with repetition frequencies up to hundreds of Hertz in the near IR, visible and UV spectral ranges widely used in applied scientific research, medicine, environmental monitoring systems environment.

As lasers in the infrared range are commonly used lasers podesteria crystals (YAG:Nd, AI:Nd and others). For generation in the visible and UV ranges often used cascaded frequency conversion of the radiation at higher harmonics in nonlinear crystals, such as the crystals of the KTP, BBO, LBO, with high nonlinearity and high radiation resistance.

For further development and improvement of some of the scientific and technical areas, in particular, environmental monitoring systems, using the methods of fluorescence spectroscopy for the identification of impurities and their concentrations in the aquatic environment, it is necessary to apply multi-laser system. Such a laser system for excitation of interest analysis must generate the pulses in the tion in the visible and UV ranges, discrete change not only the radiation frequency, and duration of pulses in a wide range (from nanosecond to sub-nanosecond range), as well as to smoothly change the power of the pulses of radiation at each wavelength without changing other parameters such as pulse duration, beam diameter, divergence.

Currently, the generation of subnanosecond pulses is achieved in microchip lasers YAG:Nd with passive shutter from a crystal YAG:Cr4+Diode pumped [1, 2]. Because the length of the resonator microchip laser is several mm, the pulse duration of the radiation in the modulation mode of the resonator q factor falls in the subnanosecond range 0,1...0,4 NS.

Closest to the technical essence of the present invention is a pulsed solid-state laser system based on microchip laser with a passive shutter from a crystal YAG:Cr4+diode-pumped, dvuhprohodnoe amplifier and nonlinear elements for frequency conversion of the radiation at higher harmonics [3].

However, in this laser system, there is no possibility of discrete frequency radiation and discrete adjustment of the pulse duration in the nanosecond range. For a number of scientific and applied tasks of such a laser system to limit the application of the developed techniques in si is at his narrow features. You will need to use an additional laser (or lasers), which creates significant difficulties in the use of multiple lasers within a single experimental complex, and increases the cost of the complex. Creating a multi-functional laser system can solve these problems.

The purpose of this invention is to provide a laser system capable of generating one direction pulses with a discretely tunable duration, with a discretely tunable frequency radiation and with smoothly variable power.

To solve the problem in a pulsed solid-state laser system with the generation of high harmonic radiation, containing a microchip laser with a passive shutter from a crystal YAG:Cr4+, diode-pumped, dwupokojowy amplifier and nonlinear elements for frequency conversion of the radiation at higher harmonics added by the preamplifier, in the optical system which is introduced from one side of the active element, the first deaf mirror, the input polarizer, an electro-optical element, a 90-degree rotator polarization plane, mounted on the first dip of the transporting device, the prism, the output polarizer, rotating mirror, a second remote mirror, covered by the first section of the two-section screen installed on the torus-off device, on the other side of the active element entered the third deaf mirror, providing a passing beam microchip laser through the active element on a trajectory that is similar to the Roman numeral V, in the optical scheme dvuhprohodnogo amplifier entered electro-optical element in the optical layout of nonlinear elements for frequency conversion of the radiation at higher harmonics introduced by the mirrors and a dispersive prism, including mirrors and prisms to move the device, allowing for appropriate switching enable to ensure the passage of a beam in a specific non-linear element for frequency conversion of the radiation into the upper harmonics and subsequent selection by one for all harmonic direction, and first and second move the device arranged so that when they are simultaneously off a 90-degree rotator polarization plane is outside of the beam, the first section of the two sections of the screen to open the second remote mirror, forming with the first and third deaf mirrors of the optical resonator and the beam microchip laser is overlapped with the second section of the two sections of the screen.

While moving off devices preamp is converted into a laser which generates pulses with a duration in the nanosecond range and maintain the same direction, R is prostrate radiation. The laser system appears infinitely variable power pulses coming out of the amplifier, which allows you to smoothly change the power pulses of higher harmonics. The possibility of discrete switching frequency radiation with the preservation of a unified direction of the radiation output of the system for all harmonics.

Thus, the proposed device is a multifunction laser system, is able to discretely adjust pulses of sub-nanosecond to nanosecond range and the frequency of radiation in the visible and UV spectral ranges, as well as to smoothly adjust power radiation.

The drawing shows the optical scheme of the proposed device.

In the optical scheme of the laser system are the microchip laser 1 from the crystal YAG:Nd with passive shutter from a crystal YAG:Cr4+diode pumped fiber, a dual screen on the transporting device 2, the rotary mirror 3, a lens 4; a preamplifier consisting of deaf mirrors 5-8, the input polarizer 9, the electro-optical element 10, 90-degree rotator polarization plane on the moving device 11, a diaphragm 12, a rotary prism 13, the active element of the YAG:Nd 14, the output polarizer 15; amplifier comprising an input polarizer 16 90-degree rotator, the polarization planes 17, the active element of the YAG:Nd 18, the output polarizer 19, the rotary mirror 20, telescope 21, the electro-optic element 22, a rotary mirror 23; turning mirrors 24 and 25, the rotator of the plane of polarization 26, nonlinear crystal KTR 27, mirrors 28-29 on the selectivity of the moving device 30, a 90-degree Versatel polarization plane 31, a nonlinear crystal BBO 32-33, selectivity moving device 34, a dispersive prism Pellin-Brock 35, the turning mirror 36.

The proposed laser system operates as follows.

The microchip laser is an emitter of the YAG:Nd with passive shutter of YAG:Cr4+diode-pumped, operates in a pulse-periodic mode with a repetition rate from 1 to 100 Hz. Due to the small length of the resonator, the pulse duration of the radiation falls in the subnanosecond range.

In parallel operation of the first and second moving devices radiation microchip laser (λ=1064 nm) passes in the optical preamplifier circuitry. During the pumping pulse across the lamp dvuhprohodnogo preamp in the element 14 occurs inverted population, resulting in the amplification of pulses of radiation of the microchip laser.

Then there is the further strengthening of the pulses in dvuhprohodnogo the amplifier ring-type in item 18.

When oduce high voltage to the electrodes of the electro-optic element 22 is depolarization of the radiation on the second pass with the loss of part of the radiation, polarized horizontally on the input polarizer 16. Thereby is achieved a smooth change of the energy level of the pulses at the second input to the amplifier and, therefore, a smooth change of the energy level of the pulses at the amplifier output.

With a smooth change of the energy level of the radiation pulses is implemented also a smooth change in energy of the radiation pulses of higher harmonics.

In the optical circuit frequency conversion are consistently located nonlinear elements KTR 27 for generating radiation of the second harmonic (λ=532 nm), BBO 32, placed in a thermostat, for generating the fourth harmonic radiation (λ=266 nm), BBO 33 for generating the third harmonic radiation (λ=355 nm) and a dispersive prisms and mirrors for discrete switching and selection of the harmonics. When the selectivity of the moving device 30, the radiation of the first harmonic is converted into the element KTR 27 in the radiation of the second harmonic in the second type of interaction and through parametric mirrors 28-29, reflecting only the second harmonic is out of the emitter. When the device 30 and the device 34 is converted radiation of the second harmonic falls within the element input 32, where the first type of interaction is converted into the fourth harmonic, after the selection of the emitter leaves only the fourth Garmo the ICA. When the devices 30 and 34 on the remote control simultaneously turns off the power to thermostat element 32, and the radiation of the second harmonic passes the element input 32 and will not be converted into the fourth harmonic, and enters the element input 33, where the generated third harmonic radiation in the first type of interaction, and after selection on the prism 35 through the mirror 36 out of the emitter. All rays alignment are in the same direction.

When turned off simultaneously moving the devices 2 and 11 90-degree rotator polarization plane removed from the optical path, and a dual screen overlaps the first section of the beam microchip laser, and the second section opens the optical path for the rear mirror 6. Deaf mirror 7 along with the mirrors 6 and 8 form trehseriynyy the resonator of the laser, ensuring the passage of generation through active element on a trajectory that is similar to the Roman numeral V, coinciding with the trajectory on which there is radiation microchip laser when the devices 2 and 11. Thus, it becomes possible to generate pulses with nanosecond duration and discrete switch in the subnanosecond range.

The results of the test of the laser system presented in the table confirm the versatility of the proposed device.

Table
The radiation wavelength, nm532355266
The pulse duration at the level of 0.5 na0,3250,3230,322
The maximum pulse energy, MJ5151,551,55
The pulse repetition rate, Hz10

The table shows that the proposed pulsed solid-state laser system is able to discretely adjust the duration of the radiation pulses of sub-nanosecond to nanosecond range and switch frequency radiation (2, 3, and 4 harmonics) in the visible and UV spectral ranges, as well as to smoothly adjust power pulses in each of the six modes of operation.

This laser system can be used in complex research, environmental monitoring and other scientific purposes, as a substitute several lasers.

Sources of information

1. J.Zayhowski, "Microchip lasers", Optical materials 11 (1999) R-267.

2. .Molva, "Microchip lasers and their applications in optical Microsystems", Optical materials 11 (1999) p.289-299.

3. U.S. patent is 6373864, 2002 - the prototype.

Pulsed solid-state laser system with the generation of high harmonic radiation, containing a microchip laser with a passive shutter from a crystal YAG:Cr4+, diode-pumped, dwupokojowy amplifier and nonlinear elements for frequency conversion of the radiation at higher harmonics, characterized in that the laser system added preamp, optical scheme which is introduced from one side of the active element, the first deaf mirror, the input polarizer, an electro-optical element, a 90-degree rotator polarization plane, mounted on the first dip of the transporting device, the prism, the output polarizer, rotating mirror, a second remote mirror, covered by the first section of the two-section screen mounted on the second dip device, and on the other side of the active element entered the third deaf mirror, ensuring the passage beam microchip laser through the active element on a trajectory that is similar to the Roman numeral V, in the optical scheme dvuhprohodnogo amplifier entered electro-optical element in the optical layout of nonlinear elements for frequency conversion of the radiation at higher harmonics introduced by the mirrors and a dispersive prism, including mirrors and prisms to move the device, allowing for with testwuide switching enable to ensure the passage of a beam in a specific non-linear element for frequency conversion of the radiation into the upper harmonics and subsequent selection by one for all harmonics direction, moreover, the first and second moving devices are arranged such that when they are simultaneously off a 90-degree rotator polarization plane is outside of the beam, the first section of the two sections of the screen to open the second remote mirror, forming with the first and third deaf mirrors of the optical resonator and the beam microchip laser is overlapped with the second section of the two sections of the screen.



 

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