Optical arrangement

Patent metadata

Field	Value
Publication number	US-11043783-B2
Application number	US-201616065829-A
Country	US
Kind code	B2
Filing date	Dec 20, 2016
Priority date	Dec 23, 2015
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

The invention relates to an optical arrangement havinga division element which divides an input beam consisting of a sequence of temporally equidistant light pulses into two spatially separate partial beams,at least one optical element through which at least one of the partial beams propagates, andat least one combination element which spatially superimposes the partial beams in an output beam. It is the object of the present invention to show a method for increasing the pulse energy of light pulses which is improved in comparison with the prior art. The invention solves this problem by virtue of the fact that the combination element superimposes a number of the temporally successive light pulses in a single light pulse in the output beam. The invention also relates to a method for increasing the pulse energy of light pulses.

First claim

What is claimed is:

1. Optical arrangement for superimposing a sequence of N temporally equidistant successive light pulses within a light beam to a single light beam, said arrangement comprised of
a division element which divides a light beam into two partial beams,
at least one optical element through which at least one of the partial beams propagates,
at least one phase matching element arranged in beam direction upstream or downstream of the optical element for influencing a phase of radiation from at least one partial beam, wherein said phase matching element is a phase modulator which varies phases of pulses from light pulse to light pulse, and
at least one combination element, which comprises two or more beam splitters arranged one behind the other in beam direction, and which spatially superimposes the partial beams in a single beam, wherein the light pulses pass through log 2 (N) delay sections of different lengths between the beam splitters,
wherein the combination element superimposes a number of temporally successive pulses in a single light pulse in the output beam.

2. Optical arrangement according to claim 1 , characterized by two or more spatially separated optical elements, wherein one of the partial beams each propagates through each of the optical elements.

3. Optical arrangement according to claim 2 , characterized in that the optical elements are optical fibers, wherein each of the fibers conducts one of the partial beams each.

4. Optical arrangement according to claim 1 , characterized in that the at least one optical element is an optical amplifier, a nonlinear optical element for spectral broadening, a mirror, a light modulator or a lens.

5. Optical arrangement according to claim 1 , characterized by at least one adjusting element suitable for adjusting the length of a delay section allocated to this adjusting element.

6. Optical arrangement according to claim 1 , characterized in that the beam splitters are polarization beam splitters, with there being half-waveplates arranged between the beam splitters.

7. Optical arrangement according to claim 1 , characterized in that the beam splitters are intensity beam splitters.

8. Method for increasing the pulse energy of light pulses, said method comprising the following steps:
generating a pulse sequence comprised of a succession of temporally equidistant pulses in an input beam,
dividing the input beam into two or more spatially separate partial beams,
spatially superimposing the partial beams in an output beam,
wherein the pulse phases are controlled in at least one of the partial beams from light pulse to light pulse, wherein the light pulses pass through log 2 (N) delay sections of different lengths between beam splitters that are arranged one behind the other in beam direction, and wherein a number of temporally successive light pulses are superimposed in a single light pulse in the output beam.

9. Method according to claim 8 , characterized in that the superimposing of light pulses in the output beam is carried out by means of two or more beam splitters arranged one behind the other in beam direction.

10. Method according to claim 9 , characterized in that the light pulses pass through delay sections of different length between the beam splitters.

11. Method according to claim 8 , comprising determining a relative phase for each individual light pulse by dividing with remainder by 2π of the product from the number of reflections at beam splitters for this light pulse with π/2.

12. Method according to claim 8 , comprising determining a relative phase for each individual light pulse by applying a differential coding algorithm.

Assignees

• Fraunhofer Ges Forschung
• Univ Jena Friedrich Schiller
• Fraunhoer Ges Zur Foerderung Der Angewandten Forschung E V

Inventors

• Müller Michael
• Kienel Marco
• Klenke Arno
• Limpert Jens
• Tünnermann Andreas

Classifications

• H01S3/2308

  Amplifier arrangements, e.g. MOPA · CPC title

• H01S3/0057 Primary

  Temporal shaping, e.g. pulse compression, frequency chirping (soliton generation and propagation G02F1/3513, H01S3/063 and H01S3/108) · CPC title

• G02B27/283

  used for beam splitting or combining · CPC title

• H01S3/067

  Fibre lasers · CPC title

• G02B27/10

  Beam splitting or combining systems (polarising systems G02B27/28; mixing and splitting light signals using optical waveguides G02B6/28; {beam shaping, e.g. changing the cross-sectional area, by dividing or superposing multiple light beams G02B27/0905}) · CPC title