# US 9,882,342 B2 · Fiber delivery of short laser pulses

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- Number: US 9,882,342 B2
- Document ID: US9882342B2
- Status: Granted
- Kind: B2
- Application number: 15/094,288
- Filed: 2016-04-08
- Published: 2016-08-18
- Granted: 2018-01-30
- Earliest claimed: 2015-02-18
- Assignees: TOPTICA Photonics AG
- Applicants: Toptica Photonics AG
- Inventors: Armin Zach; Robert Herda
- Web page: https://patentgrep.com/patent/US9882342B2

## CPC

- H01S 3/108: using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering {(mode locking using a non-linear element H01S3/1112)}
- H01S 3/0057: {Temporal shaping, e.g. pulse compression, frequency chirping (soliton generation and propagation G02F1/3513, H01S3/063 and H01S3/108)}
- H01S 3/06725: {Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]}
- H01S 3/10061: {Polarization control}
- H01S 3/06712: {Polarising fibre; Polariser}
- H01S 2301/085: solitons
- H01S 2302/02: THz - lasers, i.e. lasers with emission in the wavelength range of typically 0.1 mm to 1 mm
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL

## Abstract

A method and system for delivering laser pulses achieves the delivery of high quality laser pulses at the location of an application. The method includes the steps of: generating laser pulses, amplifying the laser pulses, temporally stretching the amplified laser pulses, and propagating the amplified laser pulses through an optical delivery fiber of desired length, wherein the laser pulses are temporally compressed in the optical delivery fiber and wherein the laser pulses undergo nonlinear spectral broadening in the optical delivery fiber.

## Claims

### Claim 1

Method for delivering laser pulses, comprising the steps of:
generating laser pulses,
amplifying the laser pulses,
propagating the amplified laser pulses through a section of highly nonlinear optical fiber having normal dispersion, wherein the laser pulses undergo nonlinear spectral broadening in the highly nonlinear optical fiber section, and wherein the width of the spectrum of the laser pulses is increased by the nonlinear spectral broadening by at least a factor of 1.2,
temporally stretching the spectrally broadened laser pulses, and
propagating the amplified laser pulses through an optical delivery fiber having a length of at least 2 meters, wherein the laser pulses are temporally compressed in the optical delivery fiber.

### Claim 2 (depends on 1)

Method of claim 1, wherein the pulse duration of the laser pulses at the end of the optical delivery fiber is less than 100 fs.

### Claim 3 (depends on 1)

Method of claim 1, wherein the pulse duration of the temporally stretched laser pulses is at least 1 ps.

### Claim 4 (depends on 1)

Method of claim 1, wherein the amplified laser pulses have a parabolic spectrum.

### Claim 5

System for delivering laser pulses, comprising:
a laser source generating laser pulses;
an optical amplifier amplifying the laser pulses;
a section of highly nonlinear optical fiber having normal dispersion, wherein the amplified laser pulses are propagated through the section of highly nonlinear optical fiber, wherein the laser pulses undergo spectral broadening in the section of highly nonlinear optical fiber, and wherein the width of the spectrum of the laser pulses is increased by the nonlinear spectral broadening by at least a factor of 1.2;
an optical stretcher temporally stretching the amplified and spectrally broadened laser pulses; and
an optical delivery fiber having a length of at least 2 meters, wherein the stretched laser pulses are propagated through the optical deliver fiber, and wherein the laser pulses are temporally compressed in the optical delivery fiber.

### Claim 6 (depends on 5)

System of claim 5, wherein the optical amplifier is a parabolic amplifier.

### Claim 7 (depends on 5)

System of claim 5, wherein the optical stretcher comprises a section of dispersion compensating optical fiber.

### Claim 8 (depends on 5)

System of claim 5, wherein the optical delivery fiber comprises a section of single mode optical fiber having anomalous dispersion.

### Claim 9 (depends on 5)

System of claim 5, wherein the length of the optical delivery fiber is at least 5 meters.

### Claim 10 (depends on 5)

System of claim 5, wherein the wavelength of the laser pulses is between 1500 nm and 1600 nm.

### Claim 11 (depends on 5)

System of claim 5, wherein the optical delivery fiber comprises sections of different types of optical fibers.

### Claim 12 (depends on 11)

System of claim 11, wherein the optical delivery fiber comprises sections of increasing nonlinearity or decreasing dispersion in propagation direction.

### Claim 13 (depends on 5)

System of claim 5, wherein the optical stretcher and the optical delivery fiber are polarization maintaining.

### Claim 14 (depends on 5)

System of claim 5, wherein the optical delivery fiber is terminated by a nonlinear frequency-converting element.

### Claim 15 (depends on 14)

System of claim 14, wherein the nonlinear frequency-converting element is a Terahertz-radiation generating antenna.