# US 12,000,878 B1 · Systems and methods for characterizing laser pulses

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- Number: US 12,000,878 B1
- Document ID: US12000878B1
- Status: Granted
- Kind: B1
- Application number: 17/688,637
- Filed: 2022-03-07
- Granted: 2024-06-04
- Earliest claimed: 2021-05-05
- Assignees: University of Central Florida Research Foundation, Inc.
- Applicants: University of Central Florida Research Foundation, Inc.
- Inventors: Michael Chini; Yangyang Liu; Shima Gholam-Mirzaei; John Beetar; Jonathan Nesper
- Web page: https://patentgrep.com/patent/US12000878B1

## CPC

- G01R 29/12: Measuring electrostatic fields {or voltage-potential}
- G01J 3/2803: {using photoelectric array detector}
- G01J 3/4406: {Fluorescence spectrometry}
- G01J 3/443: Emission spectrometry
- G02B 27/108: {for sampling a portion of a beam or combining a small beam in a larger one, e.g. wherein the area ratio or power ratio of the divided beams significantly differs from unity, without spectral selectivity}
- G02F 1/3551: {Crystals}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A laser diagnostic device may include a beamsplitter to split one or more input pulses into one or more fundamental pulses and one or more perturbing pulses, one or more beam-combining optics to combine the fundamental and perturbing pulses at a detection plane, a detector including a solid-state material at the detection plane, and a controller. The controller may receive a detector signal from the detector is indicative of nonlinear absorption in the solid-state medium of the fundamental pulses that is perturbed by the perturbing pulses. The controller may further extract a temporal electric field waveform of the one or more input pulses from the detector signal and provide as an output at least one of the temporal electric field waveform, a spectrum, or a spectral phase of the one or more input pulses.

## Claims

### Claim 1

A laser diagnostic device comprising:
a beamsplitter configured to receive one or more input pulses and split the one or more input pulses into one or more fundamental pulses and one or more perturbation pulses, the one or more fundamental pulses having a higher power than the one or more perturbation pulses;
one or more beam-combining optics to combine the one or more fundamental pulses and the one or more perturbation pulses at a detection plane;
a detector including a solid-state material located at the detection plane; and
a controller including one or more processors configured to execute program instructions causing the one or more processors to:
receive a detector signal from the detector, wherein the detector signal is indicative of non-linear absorption in a solid-state medium of the one or more fundamental pulses that is perturbed by the one or more perturbation pulses;
extract a temporal electric field profile of the one or more input pulses from the detector signal; and
provide one or more output measurements, wherein the one or more output measurements include at least one of the temporal electric field profile of the one or more input pulses, a spectrum of the one or more input pulses derived from the temporal electric field profile, or a spectral phase of the one or more input pulses derived from the temporal electric field profile.

### Claim 2 (depends on 1)

The laser diagnostic device of claim 1, wherein the non-linear absorption comprises:
at least one of a tunneling excitation or a multi-photon excitation process.

### Claim 3 (depends on 1)

The laser diagnostic device of claim 1, wherein the one or more input pulses comprise a single input pulse, wherein the beamsplitter splits the single input pulse into a single fundamental pulse and a single perturbation pulse, wherein the one or more beam-combining optics combine the single fundamental pulse and the single perturbation pulse associated with the single input pulse at the detection plane in a noncollinear geometry, wherein the one or more beam-combining optics include one or more cylindrical focusing optics to focus the single fundamental pulse and the single perturbation pulse to line beams that intersect at the detection plane, wherein a spatial dimension of the detector signal maps to a temporal dimension of the temporal electric field profile of the single input pulse.

### Claim 4 (depends on 3)

The laser diagnostic device of claim 3, wherein the solid-state material at the detection plane includes a multi-pixel sensor, wherein the multi-pixel sensor generates the detector signal.

### Claim 5 (depends on 4)

The laser diagnostic device of claim 4, wherein the multi-pixel sensor comprises:
at least one of a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device.

### Claim 6 (depends on 4)

The laser diagnostic device of claim 4, wherein the multi-pixel sensor comprises:
one or more photodetectors.

### Claim 7 (depends on 6)

The laser diagnostic device of claim 6, wherein the one or more photodetectors comprises:
at least one of a Si photodiode, a GaP photodiode, or an AlGaN photodiode.

### Claim 8 (depends on 3)

The laser diagnostic device of claim 3, wherein the solid-state material comprises:
a non-linear material, wherein the detector further includes a sensor configured to detect light emission from the non-linear material indicative of nonlinear absorption of the one or more fundamental pulses that is perturbed by the one or more perturbation pulses, wherein the detector signal is associated with the light emission.

### Claim 9 (depends on 8)

The laser diagnostic device of claim 8, wherein the non-linear material comprises:
a ZnO crystal.

### Claim 10 (depends on 8)

The laser diagnostic device of claim 8, wherein the sensor comprises:
an imaging sensor configured to image the detection plane.

### Claim 11 (depends on 8)

The laser diagnostic device of claim 8, wherein the light emission comprises:
band fluorescence.

### Claim 12 (depends on 1)

The laser diagnostic device of claim 1, wherein the one or more input pulses comprise an input beam with a plurality of input pulses, wherein the beamsplitter splits the input beam into a fundamental beam with a plurality of fundamental pulses and a perturbation beam with a plurality of perturbation pulses, wherein the one or more beam-combining optics combine the fundamental beam and the perturbation beam along a collinear path including the detection plane, wherein the one or more beam-combining optics further comprise:
an adjustable delay line configured to delay the perturbation beam with respect to the fundamental beam, wherein the detector signal is a temporal scanning detector signal associated with a plurality of delay values of the adjustable delay line to provide a plurality of relative temporal shifts between pulses of the fundamental beam and the perturbation beam.

### Claim 13 (depends on 12)

The laser diagnostic device of claim 12, wherein the solid-state material comprises:
a non-linear material, wherein the detector further includes a sensor configured to detect light emission from the non-linear material indicative of nonlinear absorption of the fundamental beam that is perturbed by the perturbation beam, wherein the detector signal is associated with the light emission.

### Claim 14 (depends on 13)

The laser diagnostic device of claim 13, wherein the non-linear material comprises:
a ZnO crystal.

### Claim 15 (depends on 13)

The laser diagnostic device of claim 13, wherein the sensor comprises:
a spectrometer.

### Claim 16 (depends on 13)

The laser diagnostic device of claim 13, wherein the sensor comprises:
a spectral filter; and
a photodiode.

### Claim 17 (depends on 13)

The laser diagnostic device of claim 13, wherein the light emission comprises:
band fluorescence.

### Claim 18 (depends on 12)

The laser diagnostic device of claim 12, wherein the solid-state material comprises:
a photodetector, wherein the photodetector generates the detector signal.

### Claim 19 (depends on 18)

The laser diagnostic device of claim 18, wherein the photodetector comprises:
at least one of a Si photodiode, a GaP photodiode, or an AlGaN photodiode.

### Claim 20 (depends on 1)

The laser diagnostic device of claim 1, wherein a bandgap energy of the solid-state material in the detector provides an upper operational limit for a photon energy of the one or more input pulses.

### Claim 21 (depends on 1)

The laser diagnostic device of claim 1, wherein the detector provides an operational wavelength range for the one or more input pulses including visible wavelengths.

### Claim 22 (depends on 1)

The laser diagnostic device of claim 1, wherein the detector provides an operational wavelength range for the one or more input pulses including near-infrared wavelengths.

### Claim 23 (depends on 1)

The laser diagnostic device of claim 1, wherein the detector provides an operational wavelength range for the one or more input pulses including mid-infrared wavelengths.

### Claim 24

A laser diagnostic method comprising:
splitting one or more input pulses into one or more fundamental pulses and one or more perturbation pulses, the one or more fundamental pulses having a higher power than the one or more perturbation pulses;
combining the one or more fundamental pulses and the one or more perturbation pulses at solid-state material at a detection plane;
generating a detector signal from a detector indicative of non-linear absorption in a solid-state medium of the one or more fundamental pulses that is perturbed by the one or more perturbation pulses;
extracting a temporal electric field profile of the one or more input pulses from the detector signal; and
providing one or more output measurements, wherein the one or more output measurements include at least one of the temporal electric field profile of the one or more input pulses, a spectrum of the one or more input pulses derived from the temporal electric field profile, or a spectral phase of the one or more input pulses derived from the temporal electric field profile.