Self-Guided Operation of Green-Pumped Singly Resonant
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Self-Guided Operation of Green-Pumped Singly Resonant CW OPO based on Bulk MgO:PPLN In-ho Bae, 1 Han Seb Moon, 1 Sebastian Zaske, 2 Christoph Becher, 2 Seung Kwan Kim, 3 Seung-Nam Park, 3 and Dong-Hoon Lee 3,* 1 Department of Physics, Pusan National University, Busan 609-735, Rep. Korea

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Self-Guided Operation of Green-Pumped Singly Resonant

CW OPO based on Bulk MgO:PPLN

In-ho Bae,1 Han Seb Moon,1 Sebastian Zaske,2 Christoph Becher,2

Seung Kwan Kim,3 Seung-Nam Park,3 and Dong-Hoon Lee3,*

1Department of Physics, Pusan National University, Busan 609-735, Rep. Korea

2Universität des Saarlandes, Fachrichtung 7.3 (Technische Physik), 66123 Saarbrücken, Germany

3Division of Physical Metrology, Korea Research Institute of Standards and Science (KRISS), Daejeon 305-340, Rep. Korea

* Email: [email protected]


Contents
Contents

  • Introduction

  • Singly resonant CW OPO setup

  • CW OPO Cavity degin

  • Experimental results

    • Wavelength tuning curve

    • Thermal wave-guide effect

    • Output power characteristics

    • Continuous tuning range

    • Thermal absorption time

    • Spatial mode profile

    • Pump mode profile

  • Summary


Introduction
Introduction

Continuous-wave (CW) optical parametric oscillators (OPOs)

based on quasi-phase-matching (QPM)

broad wavelength coverage

wide single-frequency tuning range

correlations between the signal and idler output beams

Nonlinear crystal

Cavity design

thermal lensing and de-phasing

limitation of parametric efficiency, spatial mode quality,

spectral tuning property, and stability of CW OPOs


Singly resonant opo setup
Singly resonant OPO setup

HR : high reflectivity HWP : half-wave plate

ISO : isolator A : aperture

OSA : optical spectrum analyzer BD : beam dump

MgO: PPLN

Pump : 532 nm

Signal : 770~890 nm

Oven

Idler : 1330~1680 nm

Translator

Polling period Λ

7.2 μm, 7.4 μm, 7.6 μm, 7.8 μm

XY stage


Wavelength tuning curve
Wavelength tuning curve

Idler : 1330~1680 nm

Signal : 770~890 nm

We fitted experimental results by using Sellmeier equations for 5% MgO-doped

congruent PPLN in Ref. [1].

[1] Gayer et. al. Appl. Phys. B 91, 343–348.


Thermal wave guide effect
Thermal wave-guide effect

  • Resonance frequency of the TEMnmq Mode

Laser Resonator Stability Diagram

  • Transverse mode spacing

  • Resonator g parameters & Stability condition

R = 50 mm, limited cavity length : 100 mm

L > 100 mm  unstable cavity

In our case, unstable cavity is above 122 mm.



Continuous tuning range

138 mm

132 mm

98 mm



Spatial mode profile
Spatial mode profile

Leff 109.4 mm

Leff 98 mm

Leff 115.4 mm



Summary
Summary

We operated Self-Guided singly resonant CW OPOs that was assisted by thermal wave guide effect.

We got 400 ~ 600 MHz and 600 ~ 800 MHz for continuous tuning range under the stable and unstable cavity condition, respectively.

The spatial mode of the CW OPOs were improved by thermal effect in unstable cavity and the Gaussian mode profile was achieve at the maximum cavity length.

In the near future, CW – OPOs with unstable cavity method will be used to find atomic transition spectrum though optimization and stabilization of continuous tuning range.


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