# US 10,122,143 B2 · Pulsed laser system

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- Number: US 10,122,143 B2
- Document ID: US10122143B2
- Status: Granted
- Kind: B2
- Application number: 15/680,087
- Filed: 2017-08-17
- Published: 2018-03-22
- Granted: 2018-11-06
- Earliest claimed: 2016-09-21
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: Dong Hoon Song; Moon Youn Jung
- Web page: https://patentgrep.com/patent/US10122143B2

## CPC

- H01S 3/0057: {Temporal shaping, e.g. pulse compression, frequency chirping (soliton generation and propagation G02F1/3513, H01S3/063 and H01S3/108)}
- G02F 1/3551: {Crystals}
- H01S 3/1003: {tunable optical elements, e.g. acousto-optic filters, tunable gratings}
- H01S 3/1636: {Al2O3 (Sapphire)}
- H01S 3/2308: {Amplifier arrangements, e.g. MOPA}
- H01S 3/2316: {Cascaded amplifiers}
- H01S 3/0078: {Frequency filtering}
- H01S 3/0092: {Nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity (nonlinear frequency conversion per se G02F1/35)}
- 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
- 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

Disclosed is a pulsed laser system. The pulsed laser system comprises a laser oscillator, a first optical amplifier on a rear end of the laser oscillator, a first optical adjustor on a rear end of the first optical amplifier, and a second optical adjustor on a rear end of the first optical adjustor. The first optical adjustor comprises a saturable absorber, an adjusting compressor on a rear end of the saturable absorber, and a first plasma mirror on a rear end of the adjusting compressor.

## Claims

### Claim 1

A pulsed laser system, comprising:
a laser oscillator;
a first optical amplifier on a rear end of the laser oscillator;
a first optical adjustor on a rear end of the first optical amplifier; and
a second optical adjustor on a rear end of the first optical adjustor,
wherein the first optical adjustor comprises:
a saturable absorber;
an adjusting compressor on a rear end of the saturable absorber; and
a first plasma mirror on a rear end of the adjusting compressor.

### Claim 2 (depends on 1)

The pulsed laser system of claim 1, further comprising a non-linear cross-polarization filter between the first optical amplifier and the saturable absorber.

### Claim 3 (depends on 2)

The pulsed laser system of claim 2, wherein the adjusting compressor is a second adjusting compressor, and
wherein the first optical adjustor further comprises a first adjusting compressor between the first optical amplifier and the non-linear cross-polarization filter.

### Claim 4 (depends on 2)

The pulsed laser system of claim 2, wherein each of the non-linear cross-polarization filter, the saturable absorber, and the first plasma mirror enhances a contrast ratio of a laser at its different intervals from each other.

### Claim 5 (depends on 2)

The pulsed laser system of claim 2, wherein the non-linear cross-polarization filter comprises:
a lens;
a polarizer on a rear end of the lens;
a non-linear crystal on a rear end of the polarizer; and
an analyzer on a rear end of the non-linear crystal.

### Claim 6 (depends on 1)

The pulsed laser system of claim 1, wherein the first plasma mirror comprises:
first and second mirrors; and
a driving part that moves the first and second mirrors.

### Claim 7 (depends on 1)

The pulsed laser system of claim 1, further comprising a second optical adjustor on a rear end of the second optical amplifier,
wherein the second optical adjustor comprises a second plasma mirror.

### Claim 8 (depends on 1)

The pulsed laser system of claim 1, wherein the first optical amplifier is an amplifier based on a principle of chirped pulse amplification (CPA), and the second optical amplifier is an amplifier based on a principle of optical parametric chirped pulse amplification (OPCPA).

### Claim 9

A pulsed laser system, comprising:
a laser oscillator;
first and second optical amplifiers that amplify a laser generated from the laser oscillator; and
a first optical adjustor being disposed between the first and second optical amplifiers and enhancing a contrast ratio of the laser,
wherein the first optical adjustor comprises:
a non-linear cross-polarization filter that enhances a contrast ratio of the laser at its first interval; and
a first plasma mirror that enhances a contrast ratio of the laser at its second interval.

### Claim 10 (depends on 9)

The pulsed laser system of claim 9, wherein the second interval is wider than the first interval.

### Claim 11 (depends on 9)

The pulsed laser system of claim 9, further comprising a saturable absorber between the non-linear cross-polarization filter and the first plasma mirror,
wherein the saturable absorber enhances a contrast ratio of the laser at its third interval which is narrower than the first and second intervals.

### Claim 12 (depends on 10)

The pulsed laser system of claim 10, wherein the first interval comprises the third interval, and the second interval comprises the first interval.

### Claim 13 (depends on 9)

The pulsed laser system of claim 9, wherein the first optical adjustor comprises:
a first adjusting compressor on a front end of the non-linear cross-polarization filter; and
a second adjusting mirror between the saturable absorber and the first plasma mirror.

### Claim 14 (depends on 9)

The pulsed laser system of claim 9, further comprising a second optical adjustor on a rear end of the second optical amplifier,
wherein the second optical adjustor comprises a second plasma mirror.